313072-002 [INTEL]
Advanced Memory Buffer; 高级内存缓冲器
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Intel® 6400/6402 Advanced
Memory Buffer
Datasheet
October 2006
Reference Number: 313072-002
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Copyright © 2003-2006, Intel Corporation. All Rights Reserved.
2
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Contents
1
Introduction............................................................................................................ 11
1.1
Intel® 6400/6402 Advanced Memory Buffer Overview............................................ 11
1.1.1 Transparent Mode for DRAM Test Support.................................................. 12
1.1.2 Debug and Logic Analyzer Interface.......................................................... 12
1.1.3 DDR SDRAM .......................................................................................... 12
AMB Block Diagram ........................................................................................... 12
Interfaces ........................................................................................................ 13
1.3.1 FBD High-Speed Differential Point-to-Point Link (at 1.5 V)
1.2
1.3
Interfaces ............................................................................................ 14
1.3.2 DDR2 Channel ....................................................................................... 14
1.3.3 SMBus Slave Interface ............................................................................ 14
References ....................................................................................................... 15
1.4
2
FBD Channel Interface............................................................................................. 17
2.1
2.2
2.3
Intel 6400/6402 Advanced Memory Buffer (AMB) Support for FBD Operating Modes.. 17
Channel Initialization ......................................................................................... 17
Channel Protocol ............................................................................................... 17
2.3.1 General................................................................................................. 17
2.3.2 Timeouts During TS0 .............................................................................. 17
2.3.3 Recalibrate State Considerations .............................................................. 18
2.3.4 Address Mapping of DDR Commands to DRAMs .......................................... 19
2.3.5 FBD L0s State........................................................................................ 19
Reliability, Availability, and Serviceability ............................................................. 19
2.4.1 Channel Error Detection and Logging ........................................................ 19
Channel Configuration........................................................................................ 19
2.5.1 Re-sync and Resample Modes .................................................................. 19
2.5.2 Other Channel Configuration Modes .......................................................... 20
2.5.3 Lane to Lane Skew on a Channel.............................................................. 20
Repeater Mode.................................................................................................. 21
Channel Latency ............................................................................................... 21
2.7.1 Command to Data Delay Calculation ......................................................... 21
2.4
2.5
2.6
2.7
3
DDR Interface.......................................................................................................... 25
3.1
3.2
3.3
Intel 6400/6402 Advanced Memory Buffer (AMB) DDR Interface Overview ............... 25
Data Mapping ................................................................................................... 25
Command / Address Outputs .............................................................................. 26
3.3.1 CKE Output Control ................................................................................ 27
DQS I/O and DM Outputs ................................................................................... 27
Refresh............................................................................................................ 28
3.5.1 Self-Refresh During Channel Reset ........................................................... 29
3.5.2 Automatic Refresh.................................................................................. 29
Back to Back Turnaround Time............................................................................ 30
S3 State Background Description......................................................................... 31
3.7.1 S3 Recovery Configuration Registers......................................................... 32
DDR Calibration ................................................................................................ 32
3.8.1 DRAM Initialization and (E)MRS FSM......................................................... 32
3.8.2 DQS Failure CSR .................................................................................... 33
3.8.3 Automatic DDR Bus Calibration ................................................................ 34
3.8.4 Receive Enable Calibration....................................................................... 34
3.8.5 DQS Delay Calibration............................................................................. 34
DIMM Organization............................................................................................ 35
3.4
3.5
3.6
3.7
3.8
3.9
4
Electrical, Power, and Thermal ................................................................................ 37
4.1 Electrical DC Parameters .................................................................................... 37
Intel® 6400/6402 Advanced Memory Buffer Datasheet
3
4.1.1 Absolute Maximum Ratings ......................................................................37
4.1.2 Operating DC Parameters ........................................................................37
4.1.3 AMB Power Specifications ........................................................................38
FB-DIMM Electrical Timing Specifications...............................................................44
DDR2 DRAM Interface Electrical Specifications.......................................................45
DDR2 Electrical Output Timing Specifications.........................................................46
4.4.1 Description of DQ/DQS Alignment.............................................................46
4.4.2 Description of ADD/CMD/CNTL Outputs......................................................46
4.4.3 Test Load Specification............................................................................46
4.4.4 tDVA and tDVB Parameter Description.......................................................46
4.4.5 tjit and tjitHP Parameter Description..........................................................46
4.4.6 tCVA, tCVB, tECVA and tECVB Parameter Description...................................47
4.4.7 tDQSCK Timing Parameter Description.......................................................47
4.4.8 DQ and CB (ECC) Setup/Hold Relationships to/from DQS
4.2
4.3
4.4
(Read Operation)....................................................................................48
4.4.9 Write Preamble Duration..........................................................................49
4.4.10 Write Postamble Duration ........................................................................49
4.4.11 Advance Memory Buffer Component Electrical Timing Summary....................50
4.4.12 Reference DDR2 Interface Package Trace Lengths.......................................51
SMBUS Interface ...............................................................................................51
Miscellaneous I/O (1.5 Volt CMOS Driver) .............................................................51
Thermal Diode and Analog to Digital Converter (ADC).............................................51
4.7.1 Thermal Sensor Effects on the AMB’s
4.5
4.6
4.7
Functional Behavior.................................................................................52
5
Debug and Logic Analyzer Mode...............................................................................53
5.1
Logic Analyzer Interface (LAI) Mode.....................................................................53
5.1.1 LAI Mode Architecture .............................................................................54
5.1.2 LAI Mode Clocking ..................................................................................55
5.1.3 LAI Mode Pins ........................................................................................55
5.1.4 LAI Mode Signal Definitions......................................................................56
5.1.5 LAI to DDR Pin Mapping...........................................................................57
5.1.6 FBD to LAI Signal Mapping.......................................................................58
5.1.7 LAI to DDR Pin Timing.............................................................................59
5.1.8 LAI Features ..........................................................................................60
5.1.9 LAI Block Diagram ..................................................................................67
Normal Mode Debug Features..............................................................................68
5.2.1 Normal Mode Debug Triggers ...................................................................68
5.2.2 Error Injection........................................................................................68
5.2
6
Errors ......................................................................................................................71
6.1
Types of Errors and Responses ............................................................................71
6.1.1 FBD Link Errors ......................................................................................71
6.1.2 DDR Errors ............................................................................................73
6.1.3 Host Protocol Errors ................................................................................73
6.1.4 Other Errors...........................................................................................74
Error Logging....................................................................................................74
6.2.1 Error Logging Procedure ..........................................................................74
Fail Over Mode Support ......................................................................................75
Failback to Pass-Thru .........................................................................................75
6.2
6.3
6.4
7
SMBus Interface ......................................................................................................77
7.1
System Management Access ...............................................................................77
7.1.1 SMBus 2.0 Specification Compatibility........................................................77
7.1.2 Supported SMBus Commands...................................................................77
7.1.3 FBD AMB Register Access Protocols ...........................................................78
7.1.4 SMBus Error Handling..............................................................................81
7.1.5 SMBus Resets ........................................................................................81
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
8
Clocking .................................................................................................................. 83
8.1
8.2
8.3
8.4
8.5
8.6
8.7
8.8
8.9
Intel 6400/6402 Advanced Memory Buffer (AMB) Clock Domains ............................. 83
PLL Clocks........................................................................................................ 85
Reference Clock ................................................................................................ 85
FBD Lane Frame Clocks...................................................................................... 86
Clock Ratios ..................................................................................................... 86
DDR DRAM Clock Support................................................................................... 86
SMBus............................................................................................................. 86
Clock Pins ........................................................................................................ 86
Additional Clock Modes....................................................................................... 87
8.9.1 Transparent Mode Clocking...................................................................... 87
8.10 PLL Requirements.............................................................................................. 87
8.10.1 Jitter .................................................................................................... 87
8.10.2 PLL Bandwidth Requirements................................................................... 87
8.10.3 External Reference ................................................................................. 87
8.10.4 Spread Spectrum Support ....................................................................... 88
8.10.5 Frequency of Operation........................................................................... 88
8.10.6 RESET# ................................................................................................ 88
8.10.7 Other PLL Characteristics......................................................................... 88
8.11 Analog Power Supply Pins................................................................................... 89
9
Reset....................................................................................................................... 91
9.1
Platform Reset Functionality ............................................................................... 91
9.1.1 Platform RESET# Requirements ............................................................... 91
9.1.2 RESET# Requirements............................................................................ 91
9.1.3 Power-Up and Suspend-to-RAM Considerations .......................................... 92
Reset Types...................................................................................................... 92
Pads Controlling Reset ....................................................................................... 92
9.3.1 RESET# Pad .......................................................................................... 92
9.3.2 Primary FBD Link ................................................................................... 93
Details............................................................................................................. 93
9.4.1 Cold Power-Up Reset Sequence................................................................ 93
9.4.2 S3 Restore Power-Up Reset Sequence....................................................... 94
9.4.3 Reset Sequence for a Fast Reset .............................................................. 95
9.4.4 Fast Reset Handshake............................................................................. 95
9.4.5 Timing Diagrams.................................................................................... 96
I/O Initialization................................................................................................ 97
9.5.1 FBD Channel Initialization........................................................................ 97
9.5.2 DDR ..................................................................................................... 97
9.2
9.3
9.4
9.5
10
Transparent Mode ................................................................................................... 99
10.1 Transparent Mode ............................................................................................. 99
10.1.1 Block Diagram ..................................................................................... 100
10.1.2 Transparent Mode Signal Definitions ....................................................... 100
10.1.3 Transparent Mode to FBD Pin Mapping .................................................... 101
10.2 Transparent Mode Timing................................................................................. 102
10.2.1 Clock Frequency and Core Timing........................................................... 102
10.2.2 Edge Placement Accuracy...................................................................... 102
10.2.3 Transparent Mode Timing...................................................................... 102
10.2.4 Error Reporting.................................................................................... 106
10.2.5 Transparent Mode IO Specifications ........................................................ 107
10.2.6 IO Implementation Guidelines................................................................ 108
10.3 Transparent Mode Control and Status Registers................................................... 109
11
DDR MemBIST ....................................................................................................... 111
11.1 MemBIST Overview ......................................................................................... 111
11.2 MemBIST Feature Summary ............................................................................. 112
11.3 MemBIST Operation......................................................................................... 113
Intel® 6400/6402 Advanced Memory Buffer Datasheet
5
11.3.1 Fundamental Operations........................................................................113
11.3.2 Memory Addressing ..............................................................................114
11.3.3 Memory Data Formatting .......................................................................123
11.3.4 Algorithmic Testing ...............................................................................126
11.3.5 Error Reporting and Control ...................................................................128
11.3.6 DRAM Throttling ...................................................................................131
11.3.7 Refresh Control ....................................................................................131
11.3.8 DRAM Initialization................................................................................132
11.4 MemBIST Memory Test Examples ......................................................................132
11.4.1 Write a Fixed Pattern to a Range of DRAM Addresses.................................132
11.4.2 Write Random Data to a Range of DRAM Addresses and Check ...................133
11.4.3 Write Leaping 0s to the Full DRAM Address Range and Check .....................134
11.4.4 Write 144-bit User-defined Pattern to a Range of Addresses and Check........136
11.4.5 Test a Range of DRAM Addresses With March C- Algorithm........................137
11.5 MemBIST Implementation.................................................................................138
11.5.1 MemBIST Block Diagram .......................................................................138
11.5.2 MB Flow Control State Machine...............................................................139
11.5.3 CS Finite State Machine.........................................................................141
12
Ballout and Package Information...........................................................................143
12.1 Ballout ..........................................................................................................143
12.2 655-Ball FBGA 0.8mm Pitch Pin Configuration......................................................143
12.3 Pin Assignments for the Advanced Memory Buffer (AMB).......................................144
12.4 Package Information ........................................................................................152
13
14
Signal Lists ............................................................................................................155
13.1 Conventions....................................................................................................155
13.2 Intel 6400/6402 Advanced Memory Buffer (AMB) Pin Description List......................156
Registers ...............................................................................................................159
14.1 Access Mechanisms..........................................................................................159
14.1.1 Conflict Resolution and Usage Model Limitations .......................................159
14.1.2 FBD Data on Configuration Read Returns .................................................159
14.1.3 Non-Existent Register Bits......................................................................159
14.1.4 Register Attribute Definition ...................................................................160
14.1.5 Binary Number Notation ........................................................................161
14.1.6 Function Mapping .................................................................................161
14.2 PCI Standard Header Identification Registers (Function 0).....................................169
14.2.1 VID: Vendor Identification Register .........................................................169
14.2.2 DID: Device Identification Register..........................................................169
14.2.3 RID: Revision Identification Register .......................................................169
14.2.4 CCR: Class Code Register ......................................................................170
14.2.5 HDR: Header Type Register....................................................................170
14.3 FBD Link Registers (Function 1).........................................................................170
14.3.1 FBD Link Control and Status...................................................................170
14.3.2 SM Bus Register ...................................................................................180
14.3.3 Error Registers .....................................................................................181
14.3.4 PERSONALITY BYTES Loaded From the SPD..............................................183
14.3.5 Hardware Configuration Registers ...........................................................184
14.4 Implementation Specific FBD Registers (Function 2) .............................................185
14.5 DDR and Miscellaneous Registers (Function 3).....................................................186
14.5.1 Memory Registers.................................................................................186
14.5.2 Memory BIST Registers .........................................................................191
14.5.3 Thermal Sensor Registers ......................................................................201
14.6 Implementation Specific DDR Initialization and
Calibration Registers (Function 4) ......................................................................203
14.6.1 DDR Calibration....................................................................................203
14.6.2 Memory Interface Control ......................................................................219
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
14.6.3 Firmware Support Registers................................................................... 221
14.7 DFX Registers (Function 5) ............................................................................... 222
14.7.1 Transparent Mode Registers................................................................... 222
14.7.2 Logic Analyzer Interface (LAI) Registers .................................................. 223
14.7.3 Error Injection Registers........................................................................ 230
14.8 Bring-up and Debug Registers (Function 6)......................................................... 231
14.8.1 SPAD[1:0]: Scratch Pad........................................................................ 231
14.8.2 Southbound FBD Intel® Interconnect BIST Registers................................. 231
14.8.3 Northbound FBD Intel IBIST Registers..................................................... 236
15
A
SPD Bits ................................................................................................................ 243
15.1 Access Mechanisms ......................................................................................... 243
15.1.1 Raw Cards A, B, and C.......................................................................... 243
15.1.2 Raw Cards D, E, H, and J....................................................................... 244
15.1.3 Category Byte 99 ................................................................................. 245
Glossary ................................................................................................................ 247
A.1
Terms and Definitions...................................................................................... 247
Figures
1-1
1-2
2-1
2-2
3-1
4-1
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
5-1
5-2
5-3
5-4
5-5
5-6
5-7
5-8
5-9
7-1
7-2
7-3
7-4
7-5
7-6
8-1
8-2
9-1
9-2
Advanced Memory Buffer Block Diagram............................................................... 13
AMB Interfaces ................................................................................................. 14
Delays Through an AMB ..................................................................................... 22
Command to Data Delay Timing.......................................................................... 23
Nominal Turnaround Time Timing Diagram ........................................................... 31
Latency Timing Diagrams ................................................................................... 44
tDVA and tDVB Timing Diagram .......................................................................... 46
tjit and tjitHP Timing Diagram............................................................................. 47
tCVA and tCVB Timing Diagram........................................................................... 47
tECVA and tECVB Timing Diagram ....................................................................... 47
TDQSCK Timing Diagram.................................................................................... 48
DQ and CB (ECC) Setup/Hold Relationship to/from DQS Timing Diagram .................. 48
Write Preamble Duration Timing Diagram ............................................................. 49
Write Postamble Duration Timing Diagram............................................................ 49
AMB LAI Mode Usage Diagram ............................................................................ 54
AMB LAI Mode Connectivity ................................................................................ 55
LAI Signal Group Timing..................................................................................... 60
LAI Match and Mask Logic .................................................................................. 61
Local Event Mux Block Diagram........................................................................... 62
EVBus Overview................................................................................................ 64
Event Bus Signal Timing..................................................................................... 65
LAI Qualification Signal Block Diagram ................................................................. 66
Block Diagram of AMB in LAI Mode ...................................................................... 67
SMBus Configuration Read (Block Write / Block Read, PEC Enabled)......................... 79
SMBus Configuration Read (Write Bytes / Read Bytes, PEC Enabled) ........................ 80
SMBus Configuration Double Word Write (Block Write, PEC Enabled)........................ 80
SMBus Configuration Double Word Write (Write Bytes, PEC Enabled)........................ 81
SMBus Configuration Word Write (Block Write, PEC Disabled).................................. 81
SMBus Configuration Byte Write (Write Bytes, PEC Disabled)................................... 81
AMB Clock Domains........................................................................................... 84
FBD PLL Power Supply Filter ............................................................................... 89
Cold Power-Up Reset ......................................................................................... 96
AMB Fast Reset Sequence .................................................................................. 96
10-1 DRAM Architecture ............................................................................................ 99
Intel® 6400/6402 Advanced Memory Buffer Datasheet
7
10-2 Block Diagram for the AMB in transparent mode ..................................................100
10-1 Transparent Mode Timing .................................................................................103
10-2 Transparent Mode Write Timing .........................................................................104
10-3 Transparent Mode Read Timing..........................................................................105
10-4 BL=8 Read Timing ...........................................................................................105
11-1 Range and Full Address Spaces..........................................................................117
11-2 Fast Y Address Sequencing ...............................................................................119
11-3 Fast X Address Sequencing ...............................................................................120
11-4 Fast XY Address Sequencing Examples ...............................................................121
11-5 MemBIST Circular Shift and LFSR Data Block Diagram ..........................................124
11-6 MemBIST Block Diagram ..................................................................................138
11-7 MBFSM Diagram ..............................................................................................139
11-8 CS State Machine ............................................................................................141
12-1 Pinout Configuration.........................................................................................143
12-2 Bottom View ...................................................................................................152
12-3 Top View ........................................................................................................153
12-4 Package Stackup .............................................................................................154
Tables
3-1
DQS Association with DQ/CB Pins in x8 and x4 Mode..............................................27
Absolute Maximum Ratings Over Operating Free-Air Temperature Range
4-1
(See Note 1).....................................................................................................37
AMB Operating DC Electrical Parameters...............................................................37
Power Values for x8 DIMMS ................................................................................38
Power Values for x4 DIMMs.................................................................................41
AMB FB-DIMM Timing/Electrical ...........................................................................44
AMB FB-DIMM Latency .......................................................................................44
Recommended Operating Conditions for DRAM Interface.........................................45
Advance Memory Buffer Component DDR2 Electrical Timing Specifications.................50
Advance Memory Buffer DDR2 Package Lengths.....................................................51
4-2
4-3
4-4
4-5
4-6
4-7
4-8
4-9
4-10 Recommended Operating Conditions for SMBUS Interface .......................................51
4-11 Recommended Operating Conditions for RESET and BFUNC Pins...............................51
5-1
5-2
5-3
5-4
5-5
5-6
5-7
6-1
6-2
6-3
6-4
6-5
7-1
7-2
7-3
8-1
8-2
8-3
DDR Pins Shared With LAI Functionality................................................................56
List of Pins Required to Enable Debug With LAI Functionality ...................................56
LAI Mode Added Signals .....................................................................................56
List of Shared DDR/LAI Pins ................................................................................57
Typical FBD Southbound Command Frame ............................................................59
LAI Local Events................................................................................................62
LAI Event Selection............................................................................................63
Link Errors in Initialization ..................................................................................71
Link Errors in Normal Operation...........................................................................72
DDR Errors .......................................................................................................73
Host Protocol Errors ...........................................................................................73
Other Errors......................................................................................................74
SMBus Command Encoding.................................................................................78
SMBus Protocol Addressing Fields ........................................................................78
Status Field Encoding for SMBus Reads.................................................................79
PLL Clocks ........................................................................................................85
AMB Clock Ratios...............................................................................................86
Clock Pins.........................................................................................................86
10-1 Additional Signals in Transparent Mode...............................................................101
8
Intel® 6400/6402 Advanced Memory Buffer Datasheet
10-2 Mapping of FBD Pins in Transparent Mode........................................................... 101
10-3 Mapping of Burst Position Bits to Error Capture.................................................... 106
10-4 Selection of 8 bit Data Paths When ENDOUT is Set............................................... 107
10-5 Transparent Mode FB-DIMM Interface Signaling Specifications............................... 107
11-1 MemBIST Feature Summary ............................................................................. 112
11-2 Memory Address Definition, BL=4...................................................................... 114
11-3 Memory Address Definition, BL=8...................................................................... 115
11-4 MemBIST Addressing Behavior.......................................................................... 116
11-5 Dynamic Address Inversion, XZY Address Sequencing and Range Addressing .......... 122
11-6 Example of Circular Data Shifting ...................................................................... 125
11-7 Example of LFSR Random Data ......................................................................... 126
11-8 Address Log to Bank, Row and Column Bit Correspondence................................... 129
11-9 Failure Data Bit Location Accumulator to MBDATA Bit Correspondence.................... 129
11-10 Failure to Logging Register Correspondence........................................................ 130
11-11 Refresh Programming ...................................................................................... 132
12-1 655-Ball FBGA 0.8 mm Pitch - Left Side.............................................................. 144
12-2 655-Ball FBGA 0.8 mm Pitch - Right Side............................................................ 145
12-3 Advanced Memory Buffer Signals By Ball Number ................................................ 145
13-1 Signal Naming Conventions .............................................................................. 155
13-2 Buffer Signal Types ......................................................................................... 156
13-3 Pin Description................................................................................................ 156
13-4 Pin Count....................................................................................................... 158
14-1 Access to “Non-existent” Register Bits................................................................ 159
14-2 Register Attributes Definitions........................................................................... 160
14-3 Function Mapping Legend ................................................................................. 161
14-4 Function 0: PCI Standard Header Identification Registers...................................... 162
14-5 Function 1: FBD Link Registers.......................................................................... 163
14-6 Function 2: Implementation Specific FBD Registers.............................................. 164
14-7 Function 3: DDR and Miscellaneous Registers ..................................................... 165
14-8 Function 4: Implementation Specific DDR Initialization and Calibration Registers ..... 166
14-9 Function 5: DFX Registers ................................................................................ 167
14-10 Function 6: Bring-up and Debug Registers.......................................................... 168
14-11 MBDATA Failure Address Register Correspondence to DRAM Address...................... 195
14-12 BL4 Column and Chunk Correspondence to DRAM Address.................................... 195
14-13 BL8 Column and Chunk Correspondence to DRAM Address.................................... 196
14-14 Functional Characteristics of DCALADDR............................................................. 205
14-15 Functional Characteristics of DCALDATA for Calibration Algorithms......................... 206
14-16 Functional Characteristics of DCALDATA for HVM Algorithms ................................. 208
14-17 Bit Locations for SB Match and Mask.................................................................. 224
15-1 Raw Cards A, B, and C..................................................................................... 243
15-2 Raw Cards D, E, H, and J.................................................................................. 244
15-3 Category ByteJ ............................................................................................... 245
Intel® 6400/6402 Advanced Memory Buffer Datasheet
9
Revision History
Revision
Description
Date
001
002
Updated Release
May 2006
Updated Chapter 15 SPD Bits tables
October 2006
§
10
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Introduction
1 Introduction
This document is a core specification for a Fully Buffered DIMM (FB DIMM, also FBD)
memory system. This document, along with the other core specifications, must be
treated as a whole. Information critical to an Intel® 6400/6402 Advanced Memory
Buffer (AMB) design appears in the other specifications, with specific cross-references
provided.
1.1
Intel® 6400/6402 Advanced Memory Buffer
Overview
The Intel 6400/6402 Advanced Memory Buffer (AMB) complies with the FB-DIMM
Architecture and Protocol Specification. This device supports DDR2 SDRAM memory
components. The AMB allows buffering of memory traffic to support large memory
capacities. All memory control for the DRAM devices resides in the host, including
memory request initiation, timing, refresh, scrubbing, sparing, configuration access,
and power management. The AMB interface is responsible for handling FBD channel
and memory requests to and from the local DIMM and for forwarding requests to other
DIMMs on the FBD channel.
Fully Buffered DIMM (FBD) provides a high memory bandwidth, large capacity channel
solution that has a narrow host interface. Fully Buffered DIMMs use commodity DRAMs
isolated from the channel behind a buffer on the DIMM. The memory capacity is 288
devices per channel and total memory capacity scales with DRAM bit density.
The AMB will perform the following FBD channel functions:
• Supports channel initialization procedures as defined in the initialization chapter of
the FB-DIMM Architecture and Protocol Specification to align the clocks and the
frame boundaries, verify channel connectivity, and identify AMB DIMM position.
• Supports the forwarding of southbound and northbound frames, servicing requests
directed to a specific AMB or DIMM, as defined in the protocol chapter, and merging
the return data into the northbound frames.
• If the AMB resides on the last DIMM in the channel, the AMB initializes northbound
frames.
• Detects errors on the channel and reports them to the host memory controller.
• Support the FBD configuration register set as defined in the register chapters.
• Acts as DRAM memory buffer for all read, write, and configuration accesses
addressed to the DIMM.
• Provides a read buffer FIFO and a write buffer FIFO.
• Supports an SMBus protocol interface for access to the AMB configuration registers.
• Provides logic to support MemBIST and IBIST Design for Test (DFx) functions.
• Provides a register interface for the thermal sensor and status indicator.
• Functions as a repeater to extend the maximum length of FBD Links.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
11
Introduction
1.1.1
Transparent Mode for DRAM Test Support
In this mode, the AMB will provide lower speed tester access to DRAM pins through the
FBD I/O pins. This allows the tester to send an arbitrary test pattern to the DRAMs.
Transparent mode only supports a maximum DRAM frequency equivalent to DDR2 400.
Transparent mode functionality:
• Reconfigures FBD inputs from differential high speed link receivers to two single
ended lower speed receivers (~200 MHz)
• These inputs directly control DDR2 Command/Address and input data that is
replicated to all DRAMs
• Uses low speed direct drive FBD outputs to bypass high speed Parallel/Serial
circuitry and provide test results back to tester
1.1.2
Debug and Logic Analyzer Interface
When optional LAI functionality is supported, the AMB can be used to support the
connection of FBD links to a Logic Analyzer (LA) for debug.
AMB debug functionality:
• Reconfigures DDR2 interface to act as a Logic Analyzer Interface (LAI) to observe
activity on FBD high speed links
• Triggers on programmable events in normal operation
1.1.3
DDR SDRAM
DDR2 SDRAM support:
• Supports DDR2 at speeds of 533, 667 MT/s
• Supports 256, 512, 1024, 2048 and 4096 Mb devices in x4 and x8 configurations
• 288 devices/channel (8 DIMMs/channel, 1 and 2 ranks/DIMM)
• 72-bit DDR2 SDRAM unregistered, unbuffered memory interface
1.2
AMB Block Diagram
Figure 1-1 is a conceptual block diagram of the AMB’s data flow and clock domains.
12
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Introduction
1.3
Interfaces
Figure 1-1. Advanced Memory Buffer Block Diagram
Advance Memory Buffer
2/03/04
Block DIagram
10x2
10x2
NORTH
SOUTH
Southbound
Data In
Southbound
Data Out
Data Merge
Re-Time
Re-synch
PLL
1x2
demux
10*12
PISO
mux
Ref Clock
10*12
Reset#
Link Init SM
and Control
and CSRs
Reset
Control
Init
patterns
4
4
DRAM Clock
DRAM Clock
IBIST - RX
LAI Logic
IBIST - TX
#
Command
Decoder &
CRC Check
failover
29
29
Cmd Out
DRAM Address
Command Copy
/
1
DRAM Cmd
Thermal
Sensor
DRAM Address
Command Copy
/
2
DDR State
Controller
and CSRs
Data Out
Core Control
and CSRs
36
deep
Write
Data
FIFO
72
+ 18x2
DRAM
Data / Strobe
External MEMBIST
DDR Calibration &
DDR IOBIST/DFX
Data In
LAI
Controller
Data CRC Gen
& Read FIFO
Sync & Idle
Pattern
NB LAI Buffer
Generator
IBIST - RX
IBIST - TX
SMBus
SMbus
Controller
mux
Link Init SM
and Control
and CSRs
failover
14*12
14*6*2
PISO
demux
Re-synch
Re-Time
Data Merge
Northbound
Data In
Northbound
Data Out
14x2
14x2
Figure 1-2 illustrates the AMB and all of its interfaces. They consist of two FBD links,
one DDR2 channel, and an SMBus interface. Each FBD link connects the AMB to a host
memory controller or an adjacent FBD. The DDR2 channel supports direct connection to
the DDR2 SDRAMs on a Fully Buffered DIMM.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
13
Introduction
Figure 1-2. AMB Interfaces
MEMORY INTERFACE
NB FBD
Out Link
NB FBD
In Link
AMB
SB FBD
Out Link
SB FBD
InLink
SMB
1.3.1
FBD High-Speed Differential Point-to-Point Link (at 1.5 V)
Interfaces
The AMB supports one FBD Channel interface consisting of two bidirectional link
interfaces using high-speed differential point-to-point electrical signaling.
The southbound input link is 10 lanes wide and carries commands and write data from
the host memory controller or the first adjacent DIMM in the host direction. The
southbound output link forwards this same data to the next adjacent FBD.
The northbound input link is 13 to 14 lanes wide and carries read return data or status
information from the next FB DIMM in the chain back towards the host. The northbound
output link forwards this information back towards the host and multiplexes in any read
return data or status information that is generated internally.
1.3.2
DDR2 Channel
The DDR2 channel on the AMB supports direct connection to DDR2 SDRAMs. The DDR2
channel supports two ranks of eight banks with 16 row/column request, 64 data
signals, and eight check-bit signals. There are two copies of address and command
signals to support DIMM routing and electrical requirements. Four-transfer bursts are
driven on the data and check-bit lines at 800 MHz.
Propagation delays between read data/check-bit strobe lanes on a given channel can
differ. Each strobe can be calibrated by hardware state machines using write/read trial
and error. Hardware aligns the read data and check-bits to a single core clock.
The AMB provides four copies of the command clock phase references (CLK[3:0]) and
write data/check-bit strobes (DQSs) for each DRAM nibble.
1.3.3
SMBus Slave Interface
The AMB supports an SMBus interface to allow system access to configuration registers
independent of the FBD link. The AMB will never be a master on the SMBus, only a
slave. Serial SMBus data transfer is supported at 100 kHz.
14
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Introduction
SMBus access to the AMB may be a requirement to boot a system. This provides a
mechanism to set link strength, frequency and other parameters needed to insure
robust operation given platform specific configurations. It is also required for diagnostic
support when the link is down.
The SMBus address straps located on the DIMM connector are used by the AMB to get
its unique ID.
More information is available in the SMBus chapter of this document.
Additionally, more detailed information about the SMBus, refer to the System
Management Bus (SMBus) Specification [HTTP://smbus.org/].
1.4
References
This product and datasheet are consistent with the following documents:
• FB DIMM Architecture and Protocol Specification, [1]
• FBD Design for Test, Design for Validation (DFx) Specification, [2]
• FB4300/5300/6400 DDR2 Fully Buffered DIMM Design Specification, [3]
• JEDEC DDR2 SDRAM Specification, JC 42.3 [4]
• High Speed Differential Point-to-Point Link at 1.5 V for Fully Buffered DIMM, [5]
• SMBus Specification (http://smbus.org/specs/smbus20.pdf) [6]
• Advanced Configuration and Power Interface Specification Version 2.0c
(www.acpi.info) [7]
• Moisture/Reflow Sensitivity Classification for Nonhermetic Solid State Surface
Mount Devices, IPC/JEDEC J-STD-020C
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
15
Introduction
16
Intel® 6400/6402 Advanced Memory Buffer Datasheet
FBD Channel Interface
2 FBD Channel Interface
2.1
Intel 6400/6402 Advanced Memory Buffer (AMB)
Support for FBD Operating Modes
The AMB may not support all operating modes documented in the FB-DIMM
Architecture and Protocol Specification [1]. The following list defines which features/
modes are supported:
• 14 lane northbound (NB) with and without single lane Fail Over
• 13 lane NB with and without single lane Fail Over
• 10 lane southbound (SB) with and without single lane Fail Over
• Repeater mode
• LAI mode (optional feature supported in the Intel AMB)
• Transparent mode
• Recalibrate state
The following are optional FBD features not supported in the AMB:
• 12 lane NB non-ECC
• L0s low power state
• Data mask
• Variable read latency
2.2
Channel Initialization
Refer to Chapter 3, “Channel Initialization” in the FB DIMM Architecture and Protocol
Specification [1] for FBD initialization protocol. The reset chapter covers some
additional details about the initialization process.
2.3
Channel Protocol
2.3.1
General
Refer to Chapter 4, “Channel Protocol” in the FB DIMM Architecture and Protocol
Specification [1] for FBD protocol.
2.3.2
Timeouts During TS0
The FBDLOCKTO register is used to help the AMB determine when to give up waiting for
individual lanes to bit lock. The NBLINKCFG field is used to communicate when lanes
are intentionally not in use. The BLTOCNT field is used to set a time out on waiting for a
lane to bit lock. Lanes not bit locked by this time will be marked as failed.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
17
FBD Channel Interface
2.3.3
Recalibrate State Considerations
In addition to what the FBD Architecture and Protocol specification describes around
Recalibrate State, the AMB further requires that the host be sending NOP commands in
at least the 2 frames preceding the exit from recalibrate state.
Requirement: 2 Cycles before the recalibrate counter expires, NOPs must be sent from
the host.
Recal Frame
Counter
Time
Frame Description
N
Sync with ERC bit set
NOP frame
0
N+1
N+2
...
RECALDUR
RECALDUR - 1
....
NOP frame
NOP frame
N+8
N+9
...
NOP frame
RECALDUR - 7
RECALDUR - 8
....
NOP frame - host may begin recalibration
.....
N + RECALDUR - NOP frame - host must be finished with recalibration
7
8
...
.....
....
4
N + RECALDUR - NOP frame
3
N + RECALDUR - NOP frame
2
3
2
N + RECALDUR - NOP frame - must be received at AMB without corruption
1
N + RECALDUR
0
NOP frame - must be received at AMB without corruption
Valid Sync Frame
1
0
Recal Frame Counter:54 3
Rx Data:X
2
1
0
X
X
NOP
NOP
Valid Cmd
where X represents “don’t care” data
18
Intel® 6400/6402 Advanced Memory Buffer Datasheet
FBD Channel Interface
2.3.4
Address Mapping of DDR Commands to DRAMs
20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
DDR2 x4 Config
256Mb (64Mbx4) Row
1
0
1
0
1
0
1
X
1
X
1
X
1
X
X
RS
X
X
X
X
X
X
B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 A11 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 A11 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
1KB page
Col
r/w RS
X
r/w RS
X
512Mb (128Mbx4) Row
RS A13
1KB page
1Gb (256Mbx4)
1KB page
Col
Row
Col
X
X
X
RS A13 B2 B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
r/w RS B2 B1 B0 A11 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
A14 RS A13 B2 B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
r/w RS B2 B1 B0 A11 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
X
X
2Gb (512Mbx4)
1KB page
Row
Col
0
1
X
X
20 19 18 17 16 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
DDR2 x8 Config
256Mb (32Mbx8) Row
1KB page Col
512Mb (64Mbx8) Row
1
0
1
0
1
0
1
X
1
X
1
X
1
X
X
RS
X
X
X
X
X
X
B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
B1 B0 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
r/w RS
X
r/w RS
X
X
RS A13
1KB page
1Gb (128Mbx8)
1KB page
Col
Row
Col
X
X
X
X
RS A13 B2 B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
r/w RS B2 B1 B0 AP A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
A14 RS A13 B2 B1 B0 A12 A11 A10 A9 A8 A7 A6 A5 A4 A3 A2 A1 A0
X
X
X
2Gb (256Mbx8)
Row
2.3.5
FBD L0s State
The L0s state is not supported in the AMB.
2.4
Reliability, Availability, and Serviceability
Refer to Chapter 5, “Reliability, Availability and Serviceability” in the FB DIMM
Architecture and Protocol Specification [1] for FBD RAS requirements.
2.4.1
Channel Error Detection and Logging
See for details on the error handling.
2.5
Channel Configuration
2.5.1
Re-sync and Resample Modes
A separate control is available for both the NB and SB FBD links to select between lower
latency re-sample and lower jitter re-sync modes for repeating received data. Selection
between these two modes is a function of platform design and configuration and should
be set by BIOS prior to link initialization
The FBDSBCFGNXT.SBRESYNCEN and FBDNBCFGNXT.NBRESYNCEN bits make
this selection.
Descriptions of these two modes follows.
2.5.1.1
Accumulated Tracking Effects (Re-Sample Option)
Each AMB acts as a repeater for the FBD channel. Since the data driven from each
DIMM to the next DIMM may experience random or periodic phase shifts, the effect of
these phase shifts must be accommodated in the design. Consider a system with three
DIMMs daisy-chained together. A phase shift generated in the first DIMM will be seen by
the second DIMM but will not be immediately propagated to the third DIMM. Unlike an
analog buffer, the phase shift is not automatically driven to subsequent DIMMs since
Intel® 6400/6402 Advanced Memory Buffer Datasheet
19
FBD Channel Interface
the data driven to the subsequent DIMMs is re-sampled in the AMB to reduce jitter. The
lowest latency implementation would use the derived clock to retransmit the outbound
signal. The second DIMM will see the phase shift as a slight change in the position of
the data eye at its receiver. The clock tracking loop filter in the second DIMM will
measure several bit cells and may eventually determine that it should adjust the phase
of its derived clock to capture the data closer to the center of the new data eye
location. Only when the second DIMM makes its phase change will the effect propagate
to the third DIMM. More detail of the data sampling technique may be found in the
“High Speed Differential Point-to-Point Link at 1.5V for Fully Buffered DIMM
Specification”.
2.5.1.2
Accumulated Tracking Effects (Re-Sync Option)
An alternative implementation would place a voltage/thermal (VT) drift compensation
buffer between the receiver and the transmitter section of the AMB I/O cell. The drift
compensation buffer would re-synchronize the signal with a multiple of the reference
clock. This buffer would have to be deep enough to handle the absolute magnitude of
delay change of the daisy-chain channel over voltage and temperature. More detail of
the data sampling technique may be found in the “High Speed Differential Point-to-
Point Link at 1.5V for Fully Buffered DIMM Specification”.
2.5.2
Other Channel Configuration Modes
Other channel electrical configuration parameters that should be set up prior to link
initialization include
• Link frequency (LINKPARNXT.CFREQ)
• SB Transmitter drive current (FBDSBCFGNXT.SBTXDRVCUR)
• SB Transmitter de-emphasis values (FBDSBCFGNXT.SBTXPREEMP)
• NB Transmitter drive current (FBDNBCFGNXT.NBTXDRVCUR)
• NB Transmitter de-emphasis values (FBDNBCFGNXT.NBTXPREEMP)
The parameters contained in these registers are described more completely in the
“High Speed Differential Point-to-Point Link at 1.5V for Fully Buffered DIMM
Specification”.
Additional channel configuration registers that should be set up prior to link
initialization include
• First 6 bytes of the SPD parameter registers
— SPDPAR01NXT,SPDPAR23NXT,SPDPAR45NXT
• FBD Bit Lock Time Out Register (FBDLOCKTO)
2.5.3
Lane to Lane Skew on a Channel
The FBD Channel is expected to support a maximum skew of up to 46UI. The deskew
buffers on an individual AMB need to be able to support this amount of accumulated
skew. The actual skew observed will be a function of the skew introduced by platform
layout, DIMM layout, the number of active AMBs in the channel and skew introduced by
AMBs.
20
Intel® 6400/6402 Advanced Memory Buffer Datasheet
FBD Channel Interface
2.6
Repeater Mode
The AMB may also be used as an FBD link repeater to extend distances at which links
can operate. This mode can be automatically set by the BFUNC and SA pins. In this
mode, the AMB functions in the same way as a regular DIMM with the exception that
DRAM commands are not supported.
Link behavior is the same as for normal DIMMs
• Participates in link initialization like a normal DIMM
• Responds to Reads and Writes to AMB configuration registers
• Status is returned in response to Sync commands
• Link errors are detected and alerts generated
SMBus access is the same except for the base Slave address is different than from
normal DIMM.
Slave address[6:3] = 4’b0011 for Repeaters, instead of
Slave address[6:3] == 4’b1011 for normal DIMMs
2.7
Channel Latency
The critical elements that AMB contributes to the latency calculation are the chip
crossing delays.
• Southbound latency contributions
— Delay from an input FBD link transaction to commands on the DDR interface
and
— Pass-thru delay of forwarded Southbound FBD transactions.
• Northbound latency contributions
— Delay from DDR Read data input on the last DIMM to FBD link transactions and
— Pass-thru delay of forwarded Northbound FBD transactions back towards the
host.
These timing delay values are documented in Chapter 4, “Electrical, Power, and
Thermal.”
2.7.1
Command to Data Delay Calculation
shows the various components that make up the over all delay through an AMB for a
memory command.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
21
FBD Channel Interface
Figure 2-1. Delays Through an AMB
TDimm_Cmd_Delay
TAMB_Cmd_Delay
SET
CLR
SET
CLR
D
Q
Q
D
Q
Q
DDR Command
SB Frame Clock
DRAM Clock
DDR IO CMD
Clock
DRAMs
SET
CLR
SET
Q
Q
D
Q
Q
D
DRAM Data
Data
DQS
CLR
Buffer/FIFO
NB Frame Clock
TDimm_Data_Delay
TAMB_Data_Delay
The definition for terms used in the are given below.
UI
This is the unit interval on the FBD link. This is same as the
period of the FBD link bit-rate clock.
NB:
SB:
Northbound
Southbound
TRead_Latency: DRAM Parameter. TCAS + TAdditive_Latency
TAMB_Cmd_Delay
TAMB_Data_Delay
TDimm_Cmd_Delay
This value is very specific to an AMB implementation. This is the
time it takes for the command to be transferred from the FBD
receiver to the DDR I/O Cluster. This includes any differences
between the FBD frame clock and the DDR I/O clock that latches
the command into the DDR I/O cluster. This can be different for
different DRAM frequencies.
This value is very specific to an AMB implementation. This is the
minimum time it takes for the data that is returned from the
DRAMs to be transferred from the DDR I/O cluster to the FBD I/
O for transmission on the link. This includes any buffering and
clocking delays for the data within the chip. This can be
different for different DRAM frequencies.
This includes the delays for the command through the DDR I/O
cluster, differences between DDR I/O CMD Clock and DRAM
clock, any routing delays for the clock and command on the
22
Intel® 6400/6402 Advanced Memory Buffer Datasheet
FBD Channel Interface
DIMM and any set-up and hold-times in the AMB and the
DRAMs.
TDimm_Data_Delay
This includes the routing delays for the data and strobes from
the DRAM to the AMB, skews between the DRAMs, delays
through the DDR I/O cluster and any set-up and hold-times in
the AMB and DRAMs.
TCMD_To_Data
This is equal to (TRead_Latency + TAMB_Cmd_Delay
+
T
Dimm_Cmd_Delay + TDimm_Data_Delay + TAMB_Data_Delay). This can
be specified with 1UI granularity. This will be different for each
DRAM type. It does not include any delays inside the I/O to
deskew and frame align the incoming data on the SB side nor
does it include the delays inside the NB I/O on the transmit side.
The TCAS and TAdditive_Latency are specified in the DRC register (DRC.cl and DRC.al). The
CMD2DATANXT register is initialized with a value equal to (TCMD_To_Data - TRead_Latency).
This value of CMD2DATANXT is specified in the SPD EEPROM. All AMBs are expected to
receive the data from the DRAMs with the calculated value of TCMD_To_Data
.
All AMBs power up with a default value of 5 for TCMD_To_Data. This can be done either by
setting the default values of DRC.CL and DRC.AL or by setting the default value of the
CMD2DATACUR.FRMS to be 5. The AMBs must be able to return status and
configuration register reads with this default timing. This will enable the BIOS to
initialize the proper values from SPD.
The following simplified timing diagram illustrates how the last AMB uses the values
specified in DRC.CL, DRC.AL, CMD2DATANXT.DLYFRMS and CMD2DATANXT.DLYFRAC.
Figure 2-2. Command to Data Delay Timing
In Figure 2-2, it is assumed that there are no routing delays on the DIMM itself. The
command takes 10UI to get from SB FBD to the DDR I/O (TAMB_Cmd_Delay). This
includes time it takes to validate CRC of the frame and to decode the command. It is
assumed DDR_IO_Cmd_Clk shown in is delayed from the SB_Frame_Clk by 10 UI. The
Intel® 6400/6402 Advanced Memory Buffer Datasheet
23
FBD Channel Interface
DRAM SCLK is placed at the center of the command window which adds an additional
6UI of delay. The DRAMs are programmed with a TRead_Latency of 4. The DQS strobes
are centered when they get to the AMB (3UI delay) and the data takes an additional 10
UI to propagate from the DDR I/O to the NB FBD I/O (including setup time at NB FBD
and CRC generation) before it can be clocked into the NB FBD for transmission. The
total delay without including the DRAM access time in this case is (10 + 6 + 3 + 10UI)
29UI. The CMD2DATANXT.DLYFRMS will be programmed with a value 2 and the
CMD2DATANXT.DLYFRAC with 5UI. If the AMB supports only a 2UI granularity, then the
values should be 2 frames and 6UI respectively. If an AMB does not support sub-frame
delays, it is expected that the value in SPD will be round up the to the nearest frame.
Any additional delays caused by rounding up should be supported by additional
buffering in the DDR I/O.
The above figure shows the last arriving data from the DDR. It is expected that any
data arriving earlier than this, due to differences in routing, and so forth, is buffered up
in some way inside the DDR I/O. The expectation is that all AMBs (last and
intermediate) unload the data from the DDR I/O with the timing specified by the
TCMD_To_DATA. The Last AMB is expected to be able send data on the NB links with no
additional delay added, if C2DINCRCUR.INCRDLY is 0. Any additional delay needed due
to the value programmed in C2DINCRCUR.INCRDLY register in the last AMB or to delay
the data in intermediate AMB before the merge, is handled by FIFOs in the AMB core.
In the above figure, it is assumed that the AMB can place the clocks in position shown
above. If this is not the case, then additional delays due to non-optimal placement of
the clocks should be taken into account to calculate the total delay to be programmed
into the SPD.
§
24
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
3 DDR Interface
3.1
Intel 6400/6402 Advanced Memory Buffer (AMB)
DDR Interface Overview
The DDR interface on the AMB consists of:
• A command decoder.
• A FIFO write buffer to hold the write data before it is written to the DDR channel.
The write FIFO buffer has 36 entries of 72 bits (36 x 72b). A maximum of 35
entries can be used to store DDR bursts. Write data targeted for other AMB parts
on the channel will use three of the 35 entries until the target AMB is known. The
write FIFO buffer fills at half of the DDR data rate, and empties at the DDR data
rate. The write FIFO buffer must support an invalidate write FIFO command (FBD
Soft Reset command).
• A FIFO read buffer to hold the read data so that each DIMM returns data with the
same latency as the southernmost DIMM in the chain. Latency is measured in
increments of core clock periods. The core clock runs at the DDR command clock
rate (half the data rate frequency). The latency through the FIFO read buffer on the
southernmost DIMM is expected to be zero.
• A DDR cluster which serves as a DIMM buffer by registering outbound commands
and data at output flops. The cluster also captures and levelizes incoming read
data.
• A reset FSM which puts the DIMM in self-refresh when reset is asserted, and exits
self-refresh when reset is deasserted and southbound frame training is complete.
• A calibration FSM that automatically sets the timing for DQS receiver enable and
DQS delay or equivalent DDR timing control mechanism. The DQS receiver enable
calibration uses a series of DRAM read and write operations to find the center of the
read DQS preamble. During normal operation the DQS receivers will be enabled at
the preamble center to ensure that the DQS signal is received correctly into the
AMB Component’s DDR I/O circuits. The DQS delay calibration uses a series of
reads and writes to align the read DQS waveform rising and falling edges to the
center of the DQ data eye.
• A configuration register set to allow software to issue DRAM power up and DRAM
MRS/EMRS commands, as well as a self-refresh entry command. These registers
are accessible through FBD channel commands and the SMBUS interface.
• “Burst Write Interrupt” is not supported.
3.2
Data Mapping
See the protocol chapter of the FB DIMM Architecture and Protocol Specification for the
mapping between data in DDR DRAM devices and data in FBD frame formats for 4-bit
and 8-bit devices.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
25
DDR Interface
3.3
Command / Address Outputs
Two sets of DRAM command and address output pins are provided for loading and
timing considerations. Each set drives the same DRAM commands, but the two address
busses are inverted from each other in order to reduce power consumption and heat
produced on the DIMM. The command and address output pin behavior is detailed
below:
1. Minimum address toggling. The address associated with the last command issued
on the DRAM bus is retained during DRAM NOP/Deselect commands. The address
and bank bits do not revert to all 1’s (or all 0’s) when the command bus is idle.
2. Balanced bank and address busses. With some exceptions, the bank and address
busses on the two bus copies are inverted from each other. This minimizes the
current load on the VTT supply regulator because the balanced address bus sinks as
much current as it sources. There are exceptions to the inversion behavior to allow
for commands that use one or more address bits to control DRAM functionality.
Balancing can also be disabled by setting the DRC.BALDIS register field.
Balancing Exceptions:
a. Address bit A10 is not balanced during all read, write, and precharge commands.
b. No address or bank bits are balanced during any MRS and EMRS commands.
c. Column address A0 is not balanced when the DRC.SEQADD bit is set. As with
A10, A0 is only not balanced during read, write, and precharge commands. This
mode is intended to work with DRAMs in sequential address mode.
d. No address or bank bits are balanced during any command when the
DRC.BALDIS register field is set.
3. Balanced idle command bus. When the command bus is idle, a deselect command
is issued with all chip selects high and all RAS/CAS/WE signals driven low on both
command/address copies.
4. Command/Address output control with CKE. All command and address pin outputs,
except for ODT, CKE, and CLK, will float one DRAM clock cycle after both CKE pins
transition from high to low. The command/address pins will be driven to valid signal
levels on the same cycle that either CKE pin is driven from low to high.
5. Output control during link reset. When the AMB core logic is in reset, CKE and ODT
will be driven low, and CLK will run at normal levels and frequency. The remaining
command/address pins will float during reset.
6. Command/Address output control in S3 mode. When the AMB core logic is in S3
power mode, all command/address outputs, including CKE, ODT, CLK, and all other
command/address pins, will be driven low.
7. CSR output control of command/address. All command/address pin outputs will
float when the appropriate DRC bits are set. Setting the DRC.CADIS field will float
the RAS, CAS, WE, Bank, and Address pins. DRC.CSDIS controls the chip select
pins. DRC.ODTDIS, DRC.CKEDIS, and DRC.CLKDIS float the ODT, CKE, and clock
pins respectively.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
3.3.1
CKE Output Control
The are six different functions that affect the state of the CKE outputs during normal
operation:
1. DRC.CKEFRCLOW CSR. When set, this bit forces both CKE outputs low. No other
CKE control function overrides this CSR. This allows firmware to prevent hardware
from issuing all DRAM commands. This could be used by firmware to keep the
DRAM bus idle throughout a fast reset sequence that occurs before the DRAM
initialization command sequence has been initiated.
2. Self-Refresh FSM. When entering a fast reset sequence, a hardware FSM takes
control of the DDR command bus, including the CKE outputs, in order to issue a
series of commands to put the DRAM’s into self-refresh. This FSM is overridden by
the DRC.CKEFRCLOW CSR.
3. Automatic self-refresh exit with link training. When a T0 link training sequence is
complete, both CKE outputs will be automatically asserted high in order to exit self-
refresh. This control is inhibited by setting the DSREFTC.DISSREXIT bit. The
DRC.CKEFRCLOW also overrides this automatic self-refresh exit function.
4. Self-Refresh entry DCALCSR command. The DCALCSR register can be programmed
to launch an FSM that issues a single self-refresh entry command. The
DRC.CKEFRCLOW bit overrides this function.
5. Channel commands. The host can directly control the CKE output state through
channel command protocol. The DRC.CKEFRCLOW bit overrides this function.
6. DRC CKE0 and CKE1 CSR bits. These CKE bits in the DRC are both control and
status bits for the CKE outputs. Software can write these bits to directly control the
CKE outputs. These bits reflect the state of the CKE outputs one cycle after the
output state is changed by one of the other control functions. The
DRC.CKEFRCLOW bit overrides this function.
Channel commands that change the state of the same CKE output must be separated
by at least two DRAM clock cycles. Configuration writes and channel commands that
affect the same CKE output must not occur within two cycles of each other to avoid
unstable CKE behavior.
3.4
DQS I/O and DM Outputs
The AMB sends and receives source synchronous differential strobes (DQS) to transfer
data (DQ/CB) during write and read DRAM transactions. DQS9 through DQS17 also
support the data mask (DM) function in x8 mode. Setting the MTR.WIDTH configuration
register enables x8 mode. When driving DM, the timing of the transition from floating,
to driving, and back to floating is unchanged, but DQS[17:9] do not toggle and instead
drive a constant level. DQSP[17:9] drive low and DQSN[17:9] drive high. In x8 mode
DQS[17:9] are not used to capture read data. The table below lists which DQS signals
are associated with which DQ/CB pins in x8 and x4 mode.
Table 3-1.
DQS Association with DQ/CB Pins in x8 and x4 Mode
x4 Mode: MTR.WIDTH=0
x8 Mode: MTR.WIDTH=1
DQS Pin
Output
Function
Input/Output
Data Mapping
Output
Function
Input/Output
Data Mapping
DQS17
Write DQS
CB[7:4]
DM
N/A
DQS8
Write DQS
Write DQS
CB[3:0]
Write DQS
DM
CB[7:0]
N/A
DQS16
DQ[63:60]
Intel® 6400/6402 Advanced Memory Buffer Datasheet
27
DDR Interface
Table 3-1.
DQS Association with DQ/CB Pins in x8 and x4 Mode
x4 Mode: MTR.WIDTH=0
x8 Mode: MTR.WIDTH=1
DQS Pin
Output
Function
Input/Output
Data Mapping
Output
Function
Input/Output
Data Mapping
DQS7
Write DQS
DQ[59:56]
DQ[55:52]
DQ[51:48]
DQ[47:44]
DQ[43:40]
DQ[39:36]
DQ[35:32]
DQ[31:28]
DQ[27:24]
DQ[23:20]
DQ[19:16]
DQ[15:12]
DQ[11:8]
DQ[7:4]
Write DQS
DQ[63:56]
N/A
DQS15
DQS6
DQS14
DQS5
DQS13
DQS4
DQS12
DQS3
DQS11
DQS2
DQS10
DQS1
DQS9
DQS0
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
Write DQS
DM
Write DQS
DM
DQ[55:48]
N/A
Write DQS
DM
DQ[47:40]
N/A
Write DQS
DM
DQ[39:32]
N/A
Write DQS
DM
DQ[31:24]
N/A
Write DQS
DM
DQ[23:16]
N/A
Write DQS
DM
DQ[15:8]
N/A
DQ[3:0]
Write DQS
DQ[7:0]
3.5
Refresh
The AMB is required to manage DRAM refresh during channel resets and when the
auto-refresh function is enabled. During channel resets, the Self-Refresh FSM takes
control of the DDR command bus and places the DRAMs in self-refresh mode. The
Auto-Refresh FSM generates auto-refresh commands when the DAREFTC.AREFEN bit is
set. The Self-Refresh FSM will override and take control away from the Auto-Refresh
FSM when a reset event occurs.
A self-refresh entry command can also be generated by programming the DCALCSR
register. The FSM that controls this function will be described in the DRAM initialization
and (E)MRS command section.
28
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
3.5.1
Self-Refresh During Channel Reset
The Self-Refresh FSM is launched by a sync train error on the link, or when an electrical
idle condition is detected on the link. The Self-Refresh FSM will take the DRAM’s from
an unknown state and put them into self-refresh mode. The AMB does not track the
DRAM state during normal operation, and so has a single process for getting from any
DRAM state starting point to the self-refresh state.
When launched, the Self-Refresh FSM will execute the following steps. Each step below
is one of the states of the FSM. Setting the DRC.CKEFRCLOW bit will prevent the
command sequence described below from being issued on the DDR bus since it will
force the CKE outputs low.
1. Clear the DAREFTC.AREFEN CSR to stop the AMB auto-refresh engine if enabled.
2. Block all DRAM commands, except those initiated by the self-refresh FSM.
3. Wait until any in-process read or write commands complete, with a minimum wait
time of DSREFTC.TCKE, the DRAM “Minimum CKE pulse width time” specification.
In-process reads/writes must complete to ensure that the DRAM ODT control
outputs are driven low. The minimum time allows for the case where self-refresh
entry or power-down entry was executed just before the channel reset.
4. Assert both CKE output pins by setting the DRC.CKE0/1 CSR fields. This will have
no effect on the DRAM’s if the CKE pins were already asserted.
5. Wait DSREFTC.TXSNR, the DRAM’s “Exit self-refresh to a non-read command”
specification, to allow any in-process DRAM command to complete. This allows time
to complete any command that may have been issued just before the channel reset
event, such as an auto-refresh, as well as allows for self-refresh exit that may have
been initiated when the self-refresh FSM asserted the CKE pins high.
6. Issue a “precharge all” command to both ranks. This guarantees that the DRAM’s
will be in an “idle” state.
7. Wait as required by DSREFTC.TRP, the DRAM “Precharge time.”
8. Issue an auto-refresh command to both ranks. This meets the DRAM requirement
that at least one auto-refresh command is issued between any self-refresh exit to
self-refresh entry transition. The AMB staggers the auto-refresh commands to the
two ranks by the DSRETC.DRARTIM value in order to avoid stressing the system
power supply with too many DRAM’s refreshing at the same time.
9. Wait as required by DAREFTC.TRFC, the DRAM “Refresh to active/refresh command
time.”
10.Issue a self-refresh entry command to both ranks. The AMB staggers the self-
refresh entry commands to the two ranks by the DSRETC.DRSRENT value to avoid
stressing the system power supply.
When the channel comes out of “fast reset” (exiting the FBD link disable state), the
AMB will automatically issue a self-refresh exit command to both ranks after the FBD
Link Testing State is reached and the AMB core clock is stable. Note that this does not
apply when the DISSREXIT bit is set as it should be when the AMB is powering up or
when exiting S3 mode. The DRC.CKEFRCLOW CSR also overrides the automatic exit
command by forcing the CKE outputs to stay low.
3.5.2
Automatic Refresh
The AMB has an Auto-Refresh FSM for issuing auto-refresh commands to the DRAM’s
on regular intervals. This can be enabled when the DRAM bus is otherwise idle, but not
during any other mode that generates DRAM commands, including DRAM power up and
Intel® 6400/6402 Advanced Memory Buffer Datasheet
29
DDR Interface
initialization, DDR I/O calibration, and normal operation where the FBD channel issues
DRAM commands. The DAREFTC CSR controls the refresh interval and period, and
includes an enable bit to turn auto-refresh command generation on and off. The auto-
refresh FSM may be integrated or separate from the MemBIST functions in hardware,
but the auto-refresh function runs independently of the MemBIST state. Multiple
MemBIST tests can be started and completed with the auto-refresh FSM running
during, in between, and after all MemBIST tests complete.
The Auto-Refresh FSM generates auto-refresh command requests to an arbiter in
hardware at regularly spaced intervals defined by the DAREFTC.TREFI CSR. For a single
rank DIMM the command spacing is equal to TREFI cycles. For dual rank DIMMs the
command spacing is TREFI/2, alternating between the two ranks so that each rank
receives an auto-refresh command every TREFI cycles on average. Hardware abitrates
between the Self-Refresh FSM command requests and commands generated by the
MemBIST function. When MemBIST is not running, the auto-refresh command is
immediately issued on the DDR bus. When MemBIST is running, an auto-refresh
request is posted until the MemBIST FSM can interrupt its command sequence,
precharge all open banks on all ranks, and all DRAM timing requirements are met so
that an auto-refresh command can be accepted. The MemBIST FSM resumes its
command sequence TRFC later. The MemBIST FSM must interrupt its operation within
TREFI/2 in order to avoid causing an auto-refresh command to be dropped by the
arbiter.
3.6
Back to Back Turnaround Time
The host controller is required to observe a turnaround time on the DRAM data pins
within a DIMM when switching between read and write cycles, and when switching from
reads from one rank vs. the other rank on the DIMM. The nominal turnaround time is
one clock for each parameter, which is the minimum time required to prevent a collision
of the postamble of the first transaction and preamble of the second transaction.
Additional clocks may be required by the DIMM, especially at higher speeds.
The three timing parameters are:
• Read to write turnaround time. The number of additional DRAM clocks in which the
DRAM data bus must be idle between a read from either rank and a write cycle to
either rank.
• Write to read turnaround time. The number of additional DRAM clocks in which the
DRAM data bus must be idle between a write to one rank and a read from either
rank. The write to read turnaround time to the same rank will generally dominated
by the tWTR specification, which must also be observed.
• Read to read turnaround time. The number of additional DRAM clocks in which the
DRAM data bus must be idle between a read from one rank and a read from the
opposite rank.
These parameters are dependent on the AMB design and the DIMM PC board layout.
The parameters are stored in the SPD. Each parameter is a 2 bit field allowing 0 to 3
additional clocks of turnaround time. See the FB4300/5300/6400 DDR2 Fully Buffered
DIMM Design Specification for additional details.
Figure 3-1 shows the nominal turnaround times, with no additional clocks. Note that
the DQS preamble and postamble may merge slightly when the first transaction is at
worst case timings and the second transaction is at best case timings.
30
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
Figure 3-1. Nominal Turnaround Time Timing Diagram
Clock
Postamble
A
Preamble A
Preamble B
DQS
Data
B-0
Data
B-3
Data
A-0
Data
A-1
Data
A-2
Data
A-3
Data
B-1
Data
B-2
DQ
Read to Read turnaround (nominal)
Clock
DQS
DQ
Preamble R
(read)
Postamble
R
Preamble W
(write)
Data
W-0
Data
W-3
Data
R-0
Data
R-1
Data
R-2
Data
R-3
Data
W-1
Data
W-2
Read to Write turnaround (nominal)
Clock
DQS
DQ
Postamble Preamble R
Preamble W
(write)
Postamble
R
W
(read)
Data
W-0
Data
W-3
Data
W-1
Data
W-2
Data
R-0
Data
R-1
Data
R-2
Data
R-3
Write to Read turnaround (nominal)
3.7
S3 State Background Description
S3 is a platform power down state where DRAM memory contents are preserved while
the rest of the platform powers down. This state is described more formally in the
Advanced Configuration and Power Interface Specification. It is much like the Standby
mode on mobile computers.
Functionally, the requirement for an AMB is that after a sequence in which:
• AMBS3 Recovery state is stored by the host,
• DRAMs are put into Self-Refresh,
• RESET# is asserted,
• Vcc (1.5 V), Vtt (0.9 V) and VddSPD(3.3 V) are powered down,
The contents of memory on the DIMM are preserved until S3 Recovery. Recovery
requires that the memory on the DIMM be restored without losing data integrity.
The recovery sequence is much the same as an initial power on with the exceptions of:
• Vdd is already powered on
• DDR interface state is restored from stored register values (since no calibration
which might compromise memory content is allowed)
To minimize DIMM current, VCC should be powered up during VTT transitions. The AMB
determines that it is in the S3 mode by checking that VDD (1.8 V) is powered up and
that VCC (1.5 V) is powered off. When in S3 the AMB drives all command/address
outputs (including CKE, ODT, and CLK) to a low. This keeps the DRAM in auto-refresh
and helps prevent DRAM data corruption. When coming out of the S3 mode, if the
system brings VTT (0.9 V) up before VCC the AMB will drive low into the VTT pull-up
circuitry. This causes significant current (approximately two times average but still
normal) to flow from VTT into the AMB until VCC is powered up and the AMB comes out
of S3.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
31
DDR Interface
3.7.1
S3 Recovery Configuration Registers
The following CSRs should be stored in non-volatile memory before entering S3 mode
and restored before normal DRAM transactions begin.
• DRC
• MTR
• DSREFTC
• DAREFTC
• DDR2ODTC
• CMD2DATANXT
• S3RESTORE[15:0]
• PERSBYTE[13:0] - SPD Personality Bytes
3.8
DDR Calibration
The following sections describe these DDR calibration and initialization features:
• DRAM initialization and (E)MRS command CSR’s and FSM
• DQS failure CSR
• DQS receive enable calibration
• DQS calibration
3.8.1
DRAM Initialization and (E)MRS FSM
The AMB provides a set of CSR’s and an FSM that allow BIOS to manage DRAM power
up initialization and set DRAM mode register bits. All commands needed for DRAM
initialization can be generated, including precharge, refresh, mode register set (MRS),
and extended mode register set EMRS commands. A self-refresh command can also be
generated, although this is not required for initialization. The initialization/(E)MRS FSM
only controls the issuing of single commands, and does not automatically initialize the
DRAM. It is the responsibility of software to control the command sequence to correctly
initialize the DRAM.
The set of CSR’s include the DCALCSR and DCALADDR registers. The fields of these
CSR’s are described in detail in the configuration register chapter.
The DCALCSR is used to select the command to be issued, which ranks to select, start
the FSM that issues the command, and provide completion status.
The DCALADDR sets the bank and address issued to the DRAM, and therefore defines
the type of (E)MRS to be issued, including limited OCD commands. The DCALADDR can
also be used to configure a precharge command as a “precharge all” command.
DCALADDR[31:16] defines the DDR address bus during these commands, and
DCALADDR[2:0] defines the ddr bank address bus.
The FSM that controls this function can have as few as three states: idle, issue
command, and clear start bit. When the DCALCSR.START bit is set, and the
DCALCSR.OPCODE bits select one of the command options, the FSM transitions from
idle to the “issue command” state. After the command is issued, the FSM clears the
DCALCSR.START bit and returns to the idle state. A more elaborate FSM may also be
implemented. Firmware is required to control the minimum command spacing to meet
all DRAM timing requirements. After setting the start bit, firmware should poll the
32
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
DCALCSR until the start bit is cleared. After the start bit is cleared, firmware waits a
period of time based on DRAM command timing specifications before issuing a new
command through the DCALCSR.
3.8.1.1
OCD EMRS Commands
FB DIMM DRAM timing is set up to work with OCD default calibration. Using the
DCALCSR and DCALADDR registers, EMRS OCD default and OCD exit commands can be
sent to the DRAMs.
Sending OCD EMRS drive(0), drive(1), or adjust DRAM commands may have
implementation dependent outcomes and should not be used in normal operation.
3.8.1.2
MRS Command Example
The following example shows how to send out an MRS command:
1. Write a value of 0x02320000 to the DCALADDR csr. This will configure the address/
bank bus for an MRS command with burst length 4, CAS latency 3, and write
recovery 2.
2. Write a value of 0x80000003 to the DCALCSR. This selects the (E)MRS command
mode and initiates the FSM that will issue the command.
3. Poll the DCALCSR until bit 31 is cleared to zero by hardware. This indicates that the
FSM has completed the selected operation.
3.8.2
DQS Failure CSR
The DQSFAIL CSR allows the AMB to calibrate properly even when one or more DQS
signals are missing, either through PCB or component failure. DQSFAIL is a 36 bit
register, one bit for each DQS pair of each rank. Software can set this CSR to force any
DQS signal to be excluded from the automatic DDR bus calibration. Hardware will also
detect missing DQS signals and automatically exclude them from calibration.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
33
DDR Interface
3.8.3
Automatic DDR Bus Calibration
The AMB has two automatic DDR bus calibration functions that must be executed
before read data can be captured reliably. These functions issue a series of write and
read transactions on the DRAM bus, analyze the read data captured, and program a set
of calibration results configuration registers. During subsequent operations, these
configuration registers control the DDR I/O circuits and ensure proper data capture.
DIMM memory contents are not preserved during calibration. Calibration can take up to
several ms to complete. The following steps run the calibration:
1. Program the DCALCSR to 0x8000000C. This selects and initiates the first of two
calibrations.
2. Poll the DCALCSR until bit 31 is cleared to zero by hardware.
3. Program the DCALCSR to 0x80000005. This selects/initiates the second calibration.
4. Poll the DCALCSR until bit 31 is cleared to zero by hardware.
3.8.4
Receive Enable Calibration
The DQS input receiver needs to be disabled when the DDR bus is floating (tri-stated),
for example, between the read and write data transfers. Otherwise, the floating strobe
would cause spurious data to be written into the read data FIFO. Also, the DQS input
receiver needs to be disabled during a write so that the write data strobes do not cause
unwanted data or check-bits to be written into the read data FIFO.
During a read, the DRAM’s initially drive the DQS signals low for a full cycle. This is the
preamble. After the preamble, the DQS signals are toggled twice per cycle, for every
cycle there is a data transfer, which is determined by the configured burst length and
the number of back-to-back read commands that were issued to the selected rank.
After the last DQS falling edge, the DQS signal is driven low for a half cycle. This is the
post-amble. After the post-amble the DQS signals are tri-stated.
The AMB automatically finds the end of the preamble of each of the 18 DQS pairs on
the DDR bus. That is, it finds the location of the first waveform transition that defines
the end of the preamble of each DQS pair. Once this is complete, the AMB calculates
the location of the center of the preambles, and stores this information for use during
read transactions. Receiver calibration is initiated by setting the DCALCSR.START CSR.
Hardware clears this bit when the calibration is complete. The calibration method
modifies the data contents of the DIMM.
3.8.5
DQS Delay Calibration
The DQS Delay calibration adjusts the AMB Component’s on-chip delay circuits that
align DQS signals to the center of their associated DQ/CB data eyes at the capture flops
in the DDR I/O cluster. This maximizes the DQ/CB setup and hold time at these flops,
which capture source synchronous data from the DDR data bus.
DQS delay calibration is initiated by setting the DCALCSR.START CSR. Hardware clears
this bit when the calibration is complete. The calibration method modifies the data
contents of the DIMM. The calibration is accomplished by issuing a series of write and
read transactions, and comparing expected to captured data
34
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR Interface
3.9
DIMM Organization
The AMB supports DIMMs with 1 or 2 independent ranks (chip-selects). Each rank
consists of DDR SDRAM devices or DDR SDRAM devices. Dual rank DIMMs consist of
DDR SDRAM devices or DDR SDRAM devices.
The AMB DDR I/O circuits provide three main functions: an outbound command and
data path, an inbound data path, and analog compensation.
Analog compensation is provided, along with configuration registers, to control and
match the output impedance and slew rate of the off-chip drivers and on on-die
termination. The main configuration registers are the leg override (for impedance) and
slew override fields of the spdpar67cur and spdpar1011cur CSR’s. The analog
compensation circuits match driver characteristics to a ratio of an externally provided
resistance. The CSR’s control the ratio.
The outbound data path is relatively simple compared to the inbound. On the outbound
command, the I/O circuits provide a minimum latency, registered path to transfer
commands from the core to the DDR command bus as quickly as possible, but with
tight timing control. For the DQ, DQS, and DRAM clock outputs, the I/O provides
registered paths to transfer these signals to the DDR bus with the proper phase
relationship to the command. The phase of the DRAM clocks (along with the DQS and
DQ phase) relative to the command can be controlled by the ddr1xphsel and ca2xphsel
fields of the spdpar45cur and spdpar67cur CSR’s.
The inbound data path includes calibrated receiver enable circuits, calibrated DQS delay
lines, and an eight entry deep levelization FIFO. Calibration is controlled by the core at
power up and can take several ms to execute. Calibration involves a series of read and
write operations to the DRAM. Receiver enable is calibrated on a per byte basis. DQS
delay is calibrated at a coarse level on a word basis, with a fine calibration adjustment
for each nibble. The fine adjustment can be dynamic so that a different calibration
value can be sent from the core for each nibble depending on which rank is being
accessed. The core provides a read pointer to access the contents of the FIFO. The IO
I/O circuits manage the FIFO write pointer automatically, with timing based on both the
receiver enable and DQS delay calibrations.
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
35
DDR Interface
36
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
4 Electrical, Power, and Thermal
This chapter contains a description of the Intel 6400/6402 Advanced Memory Buffer
(AMB)’s electrical DC parameters, timing parameters, power considerations, and
thermal considerations.
4.1
Electrical DC Parameters
4.1.1
Absolute Maximum Ratings
Table 4-1 contains absolute maximum ratings over operating free-air temperature
range (see Note 1).
Table 4-1.
Absolute Maximum Ratings Over Operating Free-Air Temperature Range
(See Note 1)
Symbol
Parameter
Min
Max
Unit
V
V
Supply voltage DRAM Interface
–0.5
–0.5
+2.3
+2.3
V
V
DD
IN (DDR2), OUT (DDR2)
V
Voltage on any DDR2 interface pin relative to Vss
(See Notes 2 and 3)
I
I
I
(V < 0 or V > V )
DD
Input clamp current
+30
+30
mA
mA
mA
mA
V
INK
IN
IN
(V
< 0 or V
> V )
DD
Output clamp current
Continuous output current
OUTK
OUT
OUT
(V
= 0 to V )
DD
+30
OUT
OUT
N/A
Continuous current through each V
or GND
+100
+1.75
+100
DD
V
T
Supply voltage for Core and High Speed Interface
Storage temperature range
–0.3
–55
CC
°C
stg
Notes:
1.
Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under
“recommended operating conditions” is not implied. Exposure to absolute-maximum-rated conditions for extended periods
may affect device reliability.
2.
The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are
observed.This value is limited to 2.3 V maximum.
4.1.2
Operating DC Parameters
Table 4-2 contains the electrical DC parameters for the AMB part for normal operation.
Table 4-2.
AMB Operating DC Electrical Parameters
Parameter
link / core
AMB Mode
Units
Min
Typ
Max
V
V
V
Volts
Volts
Volts
1.455
1.7
1.5
1.8
3.3
1.575
1.9
CC
DD
3.0
3.6
DDSPD
Note:
There will also be a VTT termination supply at VDDR/2 available on the DIMM but does
not connect to the AMB.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
37
Electrical, Power, and Thermal
4.1.3
AMB Power Specifications
Table 4-3 contains the AMB power specifications related to parameters stored in the
SPD for the AMB .
Table 4-3.
Power Values for x8 DIMMS (Sheet 1 of 3)
533 MHz
667 MHz
Power
Supply
Thermal
Design
Max
Current
Thermal
Design
Max
Current
Symbol
Conditions
Units
Notes
Idd_Idle_0
Idle Current, single or
last DIMM
L0 state, idle (0 BW)
Primary channel
enabled, Secondary
Channel Disabled
@1.5 V
@1.8 V
@3.3 V
2.1
2.2
0.7
2.4
2.6
0.7
A
A
A
0.6
0.6
CKE high. Command
and address lines
stable.
DRAM clock active.
Idd_Idle_0 Total Power
3.5
2.7
0.6
4.0
3.1
0.6
W
A
Idd_Idle_1
Idle Current, first DIMM @1.5 V
3.0
0.7
3.4
0.7
L0 state, idle (0 BW)
Primary and Secondary
@1.8 V
A
channels enabled
@3.3 V
A
CKE high. Command
and address lines
stable.
DRAM clock active.
Idd_Idle_1 Total Power
4.6
2.4
1.1
5.1
2.8
1.2
W
A
Idd_TDP_0
Active Power, TDP BW,
Single or Last DIMM
@1.5 V
@1.8 V
@3.3 V
2.6
1.3
3.0
1.3
A
L0 state
(for AMB spec,
Not in SPD)
TDP Channel BW =
2.0GB/s@533; 2.4GB/
s@667;
A
DIMM BW = 2.0GB/
s@533; 2.4GB/s@667;
67% read, 33% write.
Primary channel
Enabled
Secondary channel
Disabled
CKE high. Command
and Address
Idd_TDP_0 Total Power
5.2
3.0
0.9
5.8
3.5
0.9
W
A
Idd_TDP_1
Active Power, TDP BW,
First DIMM
@1.5 V
@1.8 V
@3.3 V
3.3
1.0
3.8
1.0
A
L0 state
(for AMB spec,
Not in SPD)
TDP Channel BW =
2.0GB/s@533; 2.4GB/
s@667;
A
DIMM BW =2/3 Channel
BW = 1.3GB/s@533;
1.6GB/s@667;
67% read, 33% write.
Primary channel
Enabled
Secondary channel
Enabled
CKE high. Command
and Ad
38
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
Table 4-3.
Power Values for x8 DIMMS (Sheet 2 of 3)
533 MHz
667 MHz
Power
Supply
Thermal
Design
Max
Current
Thermal
Design
Max
Current
Symbol
Conditions
Units
Notes
Idd_TDP_1 Total Power
5.8
6.4
W
A
Idd_Active_1
Active Power
L0 state.
@1.5 V
@1.8 V
@3.3 V
3.1
1.2
3.4
1.3
3.6
1.2
3.9
1.3
A
50% DRAM BW, 67%
read, 33% write.
A
Primary and Secondary
channels enabled.
DRAM clock active, CKE
high.
Idd_Active_1 Total Power
6.4
2.9
0.6
7.1
3.3
0.6
W
A
Idd_Active_2
Active Power, data pass @1.5 V
through
3.2
0.7
3.7
0.7
@1.8 V
A
L0 state.
50% DRAM BW to
@3.3 V
A
downstream DIMM,
67% read, 33% write.
Primary and Secondary
channels enabled
CKE high. Command
and address lines
stable.
DRAM clock active.
Idd_Active_2 Total Power
5.0
5.6
W
A
Idd_Training
Training
@1.5 V
@1.8 V
@3.3 V
3.5
0.7
4.0
0.7
(for AMB spec,
Not in SPD)
Primary and Secondary
channels enabled.
A
100% toggle on all
channel lanes
A
DRAMs idle. 0 BW.
CKE high, Command
and address lines
stable.
DRAM clock active.
Idd_Training Total Power
W
A
Idd_IBIST
IBIST
@1.5 V
@1.8 V
@3.3 V
3.8
0.7
4.5
0.7
(for AMB spec,
Not in SPD)
Over all IBIST modes
DRAM Idle (0 BW)
A
A
Primary channel
Enabled
Secondary channel
Enabled
CKE high. Command
and Address lines stable
DRAM clock active
Idd_IBIST Total Power
W
Intel® 6400/6402 Advanced Memory Buffer Datasheet
39
Electrical, Power, and Thermal
Table 4-3.
Power Values for x8 DIMMS (Sheet 3 of 3)
533 MHz
667 MHz
Power
Supply
Thermal
Design
Max
Thermal
Design
Max
Symbol
Conditions
MemBIST
Over all MemBIST
modes
Units
Notes
Current
Current
Idd_MemBIST
(for AMB spec,
Not in SPD)
@1.5 V
@1.8 V
@3.3 V
3.3
2.1
3.8
2.1
A
A
A
>50% DRAM BW (as
dictated by the AMB)
Primary channel
Enabled
Secondary channel
Enabled
CKE high. Command
and Address lines stable
DRAM clock active
Idd_MemBIST Total Power
W
A
Idd_EI
Electrical Idle
@1.5 V
@1.8 V
@3.3 V
2.0
0.2
2.5
0.2
(for AMB spec,
Not in SPD)
DRAM Idle (0 BW)
Primary channel
Disabled
A
A
Secondary channel
Disabled
CKE low. Command and
Address lines Floated
DRAM clock active, ODT
and CKE driven low
Idd_EI Total Power
IDD_S3
W
S3 Current
VDD = 1.9V
VCC = 0V
VTT = 0V
VDD
(1.8V)
75
75
mA
Across process
variations
Across the operating
TCASE temp range
DIMM types, R/C A, B,
C, D, E, H & J
40
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
Table 4-4 contains the AMB Power Specification Parameters for the Advanced Memory
Buffer part in normal mode.
Table 4-4.
Power Values for x4 DIMMs (Sheet 1 of 3)
533 MHz
667 MHz
Power Thermal
Supply Design
Max
Current
Thermal
Design
Max
Current
Symbol
Conditions
Units
Idd_Idle_0
Idle Current, single or last
DIMM
L0 state, idle (0 BW)
Primary channel enabled,
Secondary Channel Disabled
@1.5 V 2.1
@1.8 V 0.9
@3.3 V
2.2
0.9
2.4
0.9
2.6
0.9
A
A
A
CKE high. Command and
address lines stable.
DRAM clock active.
Idd_Idle_0 Total Power
3.9
@1.5 V 2.7
@1.8 V 0.9
@3.3 V
4.4
3.1
0.9
W
A
Idd_Idle_1 Idle Current, first DIMM
3.0
0.9
3.4
0.9
L0 state, idle (0 BW)
Primary and Secondary
channels enabled
A
A
CKE high. Command and
address lines stable.
DRAM clock active.
Idd_Idle_1 Total Power
4.9
@1.5 V 2.4
@1.8 V 1.5
@3.3 V
5.5
2.8
1.5
W
A
Idd_TDP_0
Active Power, TDP BW, Single
or Last DIMM
2.6
1.6
3.0
1.6
A
L0 state
TDP Channel BW = 2.0GB/
s@533; 2.4GB/s@667;
(for AMB
spec, Not in
SPD)
A
DIMM BW = 2.0GB/s@533;
2.4GB/s@667;
67% read, 33% write.
Primary channel Enabled
Secondary channel Disabled
CKE high. Command and
Address
Idd_TDP_0 Total Power
5.9
@1.5 V 3.0
@1.8 V 1.3
@3.3 V
6.5
3.5
1.3
W
A
Idd_TDP_1
Active Power, TDP BW, First
DIMM
3.3
1.4
3.8
1.4
A
L0 state
TDP Channel BW = 2.0GB/
s@533; 2.4GB/s@667;
(for AMB
spec, Not in
SPD)
A
DIMM BW =2/3 Channel BW =
1.3GB/s@533; 1.6GB/s@667;
67% read, 33% write.
Primary channel Enabled
Secondary channel Enabled
CKE high. Command and Ad
Idd_TDP_1 Total Power
6.3
@1.5 V 3.1
@1.8 V 1.6
@3.3 V
6.9
3.6
1.6
W
A
Idd_Active_
1
Active Power
L0 state.
3.4
1.7
3.9
1.7
A
50% DRAM BW, 67% read,
33% write.
A
Primary and Secondary
channels enabled.
DRAM clock active, CKE high.
Idd_Active_1 Total Power
6.9
7.6
W
Intel® 6400/6402 Advanced Memory Buffer Datasheet
41
Electrical, Power, and Thermal
Table 4-4.
Power Values for x4 DIMMs (Sheet 2 of 3)
533 MHz
667 MHz
Power Thermal
Supply Design
Max
Current
Thermal
Design
Max
Current
Symbol
Conditions
Units
Idd_Active_
2
Active Power, data pass
through
L0 state.
50% DRAM BW to downstream @3.3 V
DIMM, 67% read, 33% write.
@1.5 V 2.9
@1.8 V 0.9
3.2
0.9
3.3
0.9
3.7
0.9
A
A
A
Primary and Secondary
channels enabled
CKE high. Command and
address lines stable.
DRAM clock active.
Idd_Active_2 Total Power
Idd_Training Training
5.5
6.1
W
A
@1.5 V
@1.8 V
@3.3 V
3.5
0.9
4.0
0.9
(for AMB
spec, Not in
SPD)
Primary and Secondary
A
channels enabled.
100% toggle on all channel
lanes
A
DRAMs idle. 0 BW.
CKE high, Command and
address lines stable.
DRAM clock active.
Idd_Training Total Power
W
A
Idd_IBIST
IBIST
@1.5 V
@1.8 V
@3.3 V
3.8
0.9
4.5
0.9
(for AMB
spec, Not in
SPD)
Over all IBIST modes
DRAM Idle (0 BW)
Primary channel Enabled
Secondary channel Enabled
A
A
CKE high. Command and
Address lines stable
DRAM clock active
Idd_IBIST Total Power
W
A
Idd_MemBI
ST
MemBIST
Over all MemBIST modes
@1.5 V
@1.8 V
@3.3 V
3.3
2.4
3.8
2.4
A
(for AMB
spec, Not in
SPD)
>50% DRAM BW (as dictated
by the AMB)
Primary channel Enabled
A
Secondary channel Enabled
CKE high. Command and
Address lines stable
DRAM clock active
Idd_MemBIST Total Power
W
42
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
Table 4-4.
Power Values for x4 DIMMs (Sheet 3 of 3)
533 MHz
Max
667 MHz
Power Thermal
Thermal
Design
Max
Current
Symbol
Idd_EI
(for AMB
spec, Not in
SPD)
Conditions
Electrical Idle
DRAM Idle (0 BW)
Primary channel Disabled
Secondary channel Disabled
Units
Supply
Design
Current
@1.5 V
@1.8 V
@3.3 V
2.0
0.2
2.5
0.2
A
A
A
CKE low. Command and
Address lines Floated
DRAM clock active, ODT and
CKE driven low
Idd_EI Total Power
W
IDD_S3
S3 Current
VDD = 1.9V
VDD
(1.8V)
75
75
mA
VCC = 0V
VTT = 0V
Across process variations
Across the operating TCASE
temp range
DIMM types, R/C A, B, C, D, E,
H & J
Notes:
1.
2.
3.
4.
Vdd : Thermal Design = 1.845 V (+2.5%) ; Max Current = 1.900 V (+5.5%)
Vcc : Thermal Design = 1.530 V (+2%) ; Max Current = 1.575 V (+5%)
Includes all DIMM DRAM organizations (SRx4, DRx4, SRx8, DRx8) and Raw Cards (A, B, C, D, E, H, J)
For x8, measured with DRx8 raw card B with 39 ohm termination for command, address, and clocks, and
47 ohm termination for CS and CKE
5.
6.
7.
For x4, measured with DRx4 raw card E with parallel 33 ohm termination for command, address, and 39
ohm termination for CS, CKE and clocks
Cards using smaller termination resistors will have higher powers. for example, x4 cards parallel 22 ohm
termination for command and address could add as much as 0.4W to the power for all states.
Total DIMM current during S3 includes AMB IDD_S3 and self-refresh current of all DRAM devices.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
43
Electrical, Power, and Thermal
4.2
FB-DIMM Electrical Timing Specifications
The FB-DIMM Channel link electrical interface is more completely described in the High
Speed Differential Point-to-Point Link at 1.5V for Fully Buffered DIMM specification.
Refer to this document for recommended operating conditions.
Table 4-5 contains the FB-DIMM electrical timing specifications.
Table 4-5.
AMB FB-DIMM Timing/Electrical
Symbol
Parameter
Units
Min
Typ
Max
Notes
tEI Propagate
tEID
EI Assertion Pass-Thru Timing
EI Deassertion Pass-Thru Timing
EI Assertion Duration
clks
clks
4
tBitLock
tEI
clks
100
1
1
1
tBitLock
tFrameLock
Bit Lock Interval
frames
frames
119
154
Frame Lock Interval
Notes:
1.
2.
Defined in FB-DIMM Architecture and Protocol Spec
Clocks defined as core clocks = 2x SCLK input
Table 4-6.
AMB FB-DIMM Latency
Date
Rate
Symbol
tC2D_AMB
Parameter
Min
Max
Units
Comments
CMD2DATA = 0x36
CMD2DATA = 0x40
533
667
533
667
533
667
533
667
533
667
18.7
16.2
20.5
17.7
0x36
0x40
0.9
22.3
19
nS
nS
nS
nS
nS
nS
nS
nS
nS
nS
tC2D_AMB
CMD2DATA
tRESAMPLE
tRESYNC
CMD2DATA = 0x40
CMD2DATA = 0x46
24.2
20.5
0x48
0x50
1.6
R/C B
R/C B
Resample Delay
1
1
2
2
0.9
1.4
Resync Delay
2.3
3.9
2
3.2
Note:
1.
tRESAMPLE is the delay from the southbound input to the southbound output, or the northbound input to
the northbound output when in resample mode, measured from the center of the data eye.
tRESYNC is the delay from the southbound input to the southbound output, or the northbound input to the
northbound output when in resync mode, measured from the center of the data eye.
2.
.
Figure 4-1. Latency Timing Diagrams
11
5
1
6
2
7
3
9
5
10 11
1
2
3
4
0
8
4
0
Receiver Input
11
6
7
9
10 11
8
Transmit Output
tRESAMPLE
tRESYNC
44
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
4.3
DDR2 DRAM Interface Electrical Specifications
Table 4-7 contains the electrical DC parameters for the AMB DDR2
Table 4-7.
Recommended Operating Conditions for DRAM Interface
Symbol
Parameter
Supply voltage
Min
Nom
Max
Unit
V
V
V
1.7
1.8
1.9
V
DD
REF
TT
Input reference voltage
Termination voltage
0.49 * V
0.50 * V
0.51 * V
DD
mV
mV
DD
DD
V
– 40
V
V
+ 40
REF
REF
REF
V
Single Ended Signals
V
V
V
V
V
V
Input voltage
0
-
-
-
-
-
-
IN
DD
DC HIGH-level input voltage
DC LOW-level input voltage
AC HIGH-level input voltage
AC LOW-level input voltage
V
V
V
/ 2 + 100
-300
V
+ 300
DD
mV
mV
mV
mV
mV
IH(dc)
IL(dc)
IH(ac)
IL(ac)
OH
DD
DD
DD
V
/ 2 - 100
DD
/ 2 + 200
-
-
V
/ 2 – 200
-
DD
Minimum Required Output Pull-up
under AC Test Load
/ 2 + 575
V
V
Maximum Required Output Pull-down
under AC Test Load
-
-
-
V
/ 2 - 575
-
mV
V
OL
DD
Output Timing Measurement
Reference Level
0.5*V
OTR
DD
I
I
Output minimum source dc current
Output minimum sink dc current
-13.8
13.8
-
-
-
-
mA
mA
OH(dc)
OL(dc)
Differential Signals
V
V
V
DC differential input voltage
AC differential input voltage
0.2
0.4
-
-
-
-
-
V
V
V
ID(dc)
ID(ac)
IX(ac)
AC differential input crossing voltage
0.5 * VDD -
0.100
0.5 * VDD +
0.100
Vr
Input timing measurement reference
level
V
IX(ac)
V
AC differential output crossing
voltage
0.5 * VDD -
0.100
-
0.5 * VDD +
0.100
V
OX(ac)
V
Output slew-rate requirement
Input leakage current (HIGH)
Input leakage current (LOW)
Input/Output Capacitance
Output Impedance
2.2
-
-
-
-
-
-
-
3.2
10
V/ns
µA
OUT (slew)
Iih
Iil
-
10
µA
C
R
2.0
13
-
2.5
20
pF
IO
OUT
C
Ohms
o
T
Package surface (case) temperature
for AMB
110
C
Notes:
1.
2.
3.
4.
5.
Values highlighted in ‘Red’ are for reference (that is, placeholder value)
No V
OUT (slew)
pin on AMB
REF
V
covers all other outputs slew rate including clock
Input voltage for all pins is limited to a maximum of 2.3 V.
VDD/2 = 1.7/2 = 850 mV; V
VOUT between VDD/2 and VDD/2 - 275 mV.
= 575 mV. (V
- VDD/2)/I
must be less than 20 Ohm for values of
OH
OUT
OUT
6.
7.
VDD/2 = 1.7/2 = 850 mV; V
between 0V and 275 mV.
IO
= 275 mV. V
/I
must be less than 20 Ohm for values of VOUT
OUT
OUT OH
C
is the Input/Output capacitance for DQ/DQS, and Output capacitance for CMD/ADDR/CK.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
45
Electrical, Power, and Thermal
4.4
DDR2 Electrical Output Timing Specifications
4.4.1
Description of DQ/DQS Alignment
The DQS output rising edge aligns with the CLK output rising edge and the DQS output
falling edge aligns with the CLK output falling edge. The DQ outputs are 1/4 cycle offset
from the DQS outputs.
DQ/DQS inputs are edge aligned and will be skewed by internal receiver DLL. Inputs
are terminated on-die by a resistive circuit during reads only.
4.4.2
Description of ADD/CMD/CNTL Outputs
ADD/CMD/CNTL outputs can be adjusted relative to CLK (see Table 4-8.) to improve
setup or hold times. The value of this delay is fixed at boot time. These outputs are
either aligned with CLK falling or with a certain timing offset before CLK falling. The
amount of offset is implementation specific (for example, can be a constant timing
offset, or a known ratio of the DRAM clock period).
4.4.3
4.4.4
Test Load Specification
DDR2 timings are specified for a 25 Ohm test load terminated to Vdd/2, measured at
the Advance Memory Buffer component package pins.
tDVA and tDVB Parameter Description
The timing parameters tDVA and tDVB indicate the time the DQ is valid after or before
DQS. tDVA is used to indicate the time that Data is Valid After. tDVA is used for DQ/
DQS write hold calculations (tDH). tDVB is used to indicate the time that Data is Valid
Before. tDVB is used for DQ/DQS write setup calculations (tDS).
Figure 4-2. tDVA and tDVB Timing Diagram
DQS/DQS
From AMB
tDVB
tDVA
DQ From
AMB
4.4.5
tjit and tjit
Parameter Description
HP
The parameter tjit is the full period jitter, and tjitHP is the half-period jitter.
46
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
Figure 4-3. tjit and tjitHP Timing Diagram
tCK/2
tjitHP
CLK/CLK
From AMB
tjit
tCK
4.4.6
tCVA, tCVB, tECVA and tECVB Parameter Description
The parameters tCVA and tCVB specify the time that command is valid after and before
CLK. tCVA stands for the time that the Command is Valid After the CLK/CLK crossing
point. tCVA is used for CA/CLK hold calculations (tIH). tCVB stands for the time that the
Command is Valid Before the CLK/CLK crossing point. tCVB is used for CA/CLK setup
calculations (tIS). Table 4-4 shows tCVA and tCVB.
tECVA and tECVB apply in early mode. For DIMMs with 36 devices, the command,
address and control signals can be shifted by 1/6 clock in early mode. Table 4-5 shows
tECVA and tECVB.
Figure 4-4. tCVA and tCVB Timing Diagram
CLK/CLK
FromAMB
tCVB
tCVA
CA From
AMB
Figure 4-5. tECVA and tECVB Timing Diagram
CLK/CLK
From AMB
tECVB
tECVA
CA From
AMB
4.4.7
tDQSCK Timing Parameter Description
tDQSCK indicated the CLK to DQS delay. This value is used for tDQSS, tDSS and tDSH
timing calculations. In order to determine these numbers accurately, package
parameters must be taken into account. This adjusts the minimum time by -110 ps and
the maximum by -70 ps.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
47
Electrical, Power, and Thermal
Figure 4-6. TDQSCK Timing Diagram
CLK (AMB)
CLK (AMB)
TDQSCK
TDQSCK
0.5xVCC
DQS (AMB)
4.4.8
DQ and CB (ECC) Setup/Hold Relationships to/from DQS
(Read Operation)
Table 4-7 shows the timing diagram for tHDamb and tSUamb. The data is launched
from the DRAM “edge aligned,” meaning that the DQ data signals switch coincident with
the DQS strobe rising and falling edges. Internal to the Advance Memory Buffer, the
DQS strobe is delayed by approximately a quarter clock, and this delayed clock is then
used to capture the DQ data. Thus, the setup time tSUamb is negative, meaning that
the data can arrive at the Advance Memory Buffer inputs after the strobe, and tHDamb
is greater than a quarter clock, so that the data will not change until after it has been
captured by the internally delayed strobe. The Advance Memory Buffer determines the
correct internal delay of strobe DQS based on a search of the data eye during the
initialization of the system. The tHDamb and tSUamb specifications are based on an
idealized data eye, where the search delays the strobe by exactly one quarter clock.
The sum of tHDamb and tSUamb is equivalent to the minimum data valid window at
the Advance Memory Buffer inputs.
Figure 4-7. DQ and CB (ECC) Setup/Hold Relationship to/from DQS Timing Diagram
DQS (AMB)
observed at pins
DQS (AMB)
observed at pins
tHDamb
tSUamb
tSUamb
DQ, CB (AMB)
observed at pins
tHDamb
DQS (AMB)
delayed internally
DQS (AMB)
delayed internally
DQS Delay
(90 deg. nom.)
48
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
4.4.9
Write Preamble Duration
The write preamble duration is the measurement from the point when DQS and DQS
start to be driven, to the crossing point of DQS and DQS. Typically, to determine when
DQS and DQS are starting to be driven, timing measurements are made at 0.5xVCC +/
- 50 mV, and 0.5xVCC +/- 100 mV, and then the measurements are linearly
extrapolated back to 0.5xVCC.
Figure 4-8. Write Preamble Duration Timing Diagram
tWPREamb
DQS
(AMB)
0.5xVCC
4.4.10
Write Postamble Duration
The write postamble duration is the measurement from the crossing point of DQS and
DQS, to the point where DQS and DQS start to go into a high impedance state.
Typically, to determine when DQS and DQS are starting to go into a high impedance
state, for DQS, timing measurements are made at Vlow + 50 mV, and Vlow + 100 mV,
and then the measurements are linearly extrapolated back to Vlow. For DQS, timing
measurements are made at Vhigh - 50 mV, and Vhigh - 100 mV, and then the
measurements are extrapolated back to Vhigh.
Figure 4-9. Write Postamble Duration Timing Diagram
tW P S T a m b
0 .5 x V C C
D Q S
(A M B )
Intel® 6400/6402 Advanced Memory Buffer Datasheet
49
Electrical, Power, and Thermal
4.4.11
Advance Memory Buffer Component Electrical Timing
Summary
Table 4-8 and Table 4-9 contain the electrical timing specifications for the Advance
Memory Buffer component DDR2 interface.
Table 4-8.
Advance Memory Buffer Component DDR2 Electrical Timing Specifications
DDR2 667
Min Max
DDR2 533
Unit
s
Symbol
Parameter
Fig #
Min
Max
System Memory Clock Timings
t
Ideal clock (CK) period
CK high time
3.0
3.75
ns
ns
ns
ps
ps
ps
CK
tCH
tCL
tjit
1.35
1.70
1.70
CK low time
1.35
CK cycle to cycle Jitter
CK half-cycle jitter
150
175
4-7
tjit
150
20
175
30
4-7
HP
TDQSCK
Clock rising edge to DQS
rising edge, or clock falling
edge to DQS falling edge --
includes -110/-70 ps for
package
-200
-210
4-10
System Memory Address/Command/Control Signal Timings (Normal)
tCVB
CMD/ADD/CNTL output valid 1260
before CLK/CLK
1615
ps
ps
4-8
4-8
tCVA
CMD/ADD/CNTL output valid 1120
after CLK/CLK -- includes
1475
-140 ps for package
System Memory Address/Command/Control Signal Timings (Early)
tECVB
tECVA
Early CMD/ADD/CNTL output 1760
valid before CLK/CLK
2240
850
4-9
4-9
Early CMD/ADD/CNTL output 620
valid after CLK/CLK --
includes -140 ps for package
System Memory Data and Strobe Signal Timings
tDVB
DQ[63:0], CB[7:0], valid
before DQS[15:0]/
575
575
1.35
750
750
ps
ps
4-6
4-6
DQS[15:0] crossing
tDVA
DQ[63:0], CB[7:0], valid
after DQS[15:0]/DQS[15:0]
crossing
tDOPW
DQ[63:0]. CB[7:0] Output
Valid Pulse Width
1.70
-700
1180
3.58
1.7
ns
ps
ps
ns
ns
tSU
DQ and CB Input Setup Time -530
to DQS Crossing
4-11
4-11
4-12
4-13
AMB
tHD
DQ and CB Input Hold Time
After DQS Crossing
970
AMB
tWPRE
tWPST
DQS Write Preamble
Duration
2.85
1.35
3.5
4.25
2.05
AMB
DQS Write Postamble
Duration
1.65
AMB
50
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Electrical, Power, and Thermal
4.4.12
Reference DDR2 Interface Package Trace Lengths
The following reference package trace lengths have been incorporated into the Advance
Memory Buffer timings in Table 4-9.
Table 4-9.
Advance Memory Buffer DDR2 Package Lengths
Signal Group
Min Length
Max Length
Units
CLK/CLK
24
4
26
20
22
16
13
mm
mm
mm
mm
mm
Command/Address
CKE, CS#
9
ODT
10
9
DQS/DQS/DQ
4.5
SMBUS Interface
Table 4-10. Recommended Operating Conditions for SMBUS Interface
Symbol
Parameter
Min
Typ
Max
Unit
Comments
3.3v +10%
V
V
V
V
Supply voltage (SMBUS)
3.0
3.3
-
3.6
0.8
V
V
DDSPD
SMBus signal input low voltage
SMBus signal input high voltage
SMBus signal output low voltage
Input Leakage per bus segment
Input Leakage per device pin
-
2.1
-
IL
-
V
V
IH
DDSPD
-
0.4
V
@I
PULLUP
OL
I
I
I
-
-
+200
+10
-
µA
µA
mA
pF
pF
LEAK-BUS
LEAK-PIN
PULLUP
-
-
Current sinking, V = 0.4V
OL
4
-
-
C
C
Capacitive load per bus segment
-
400
10
BUS
Capacitance for SMBDAT or
SMBCLK pin
-
-
I
V
Signal noise immunity from
10MHz to 100MHz
300
-
-
mV p-p
This is AC item applies to
the high-power DC
specification only
NOISE
Note: Based on High-power SMBus DC Specification
4.6
Miscellaneous I/O (1.5 Volt CMOS Driver)
Table 4-11. Recommended Operating Conditions for RESET and BFUNC Pins
Symbol
Parameter
Min
Typ
Max
Unit
Comments
V
V
DC HIGH-level input voltage
DC LOW-level input voltage
Input leakage
1.0
-
-
-
-
V
V
IH(dc)
IL(dc)
-
-
0.5
ILEAK
+ 90
µA
4.7
Thermal Diode and Analog to Digital Converter
(ADC)
A thermal diode with an analog to digital converter (ADC) is required. The thermal
sensor will be used to ensure prevention of catastrophic failure.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
51
Electrical, Power, and Thermal
An 8-bit register will store the temperature. The sensor measures from 0 to 127
degrees C measured in 0.5 degree increments in a register with values from 0 to 255.
Internal analog nodes (anode, cathode, and so forth) of this circuit will not be brought
out to package pins to keep noise at a minimum.
Refer to the Intel® 6400/6402 Advanced Memory Buffer Thermal Mechanical Design
Guide for more information on the thermal sensor.
4.7.1
Thermal Sensor Effects on the AMB’s
Functional Behavior
When enabled, the results of the thermal trip points TEMPLO and TEMPMID are
reported in FBD Status 0 responses following Sync commands.
If the temperature exceeds TEMPHI, errors are logged. If the TEMPHIENABLE bit in the
TEMPSTAT register is set, DDR shutdown occurs and FBD links go into electrical idle
mode. This over TEMPHI behavior also applies when in LAI mode. See the error chapter
for a more complete description of chip behavior when TEMPHI is exceeded.
A temperature TEMPSTAT.INCREASING bit is also generated depending on whether the
temp is greater or less than the last time the INCREASING bit was sampled. Sampling
to create INCREASING bit is controlled by writes to register UPDATED. When
temperature is above TEMPMID, this information also shows up in the
FBDS0.Thermal_Trip register field and in the Status response of FBD Sync commands
targeted to FBDS0.
§
52
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
5 Debug and Logic Analyzer Mode
5.1
Logic Analyzer Interface (LAI) Mode
This section describes the functionality of the optional Logic Analyzer Mode for the Intel
6400/6402 Advanced Memory Buffer (AMB).
The features of the logic analyzer mode (LAI mode) in the Fully Buffered DIMM will
enable select bus observability capabilities. The mode will be the basis of an LAI
assembly to provide link traffic trace capability and will support design and
manufacturing debug and validation needs for systems featuring FBD links. In this
application, the device is programmed to perform the following functions:
• Repeater pass-through operation for southbound and northbound links
• Provides enough link protocol unwinding to allow extraction of framing boundaries,
idle filtering opportunities, and pattern match triggering
• Performs logic analysis functions such as cross-triggering, match/mask, and local
event detection. These functions cannot be effectively performed using a remote
logic analyzer.
• Provides independent demuxed northbound and southbound traffic stream in LA
compatible signal levels and timing format through reuse of the existing device
DRAM I/O pins
• Provides SMB (or possibly another communications interface) access to allow
external, non-intrusive access to component LAI control functions/parameters
• The AMB is commanded to power up in LAI mode when SMA[3:2] addresses are
strapped to 2’b11 and LAI capability bit is enabled.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
53
Debug and Logic Analyzer Mode
Figure 5-1 is a conceptual depiction of the AMB used in a LAI mode application.
Figure 5-1. AMB LAI Mode Usage Diagram
LAI Interposer
Probe Assembly
Standard LA
High Density Probes
Concept Instantiation of
LAI Interposer
Using AMB
Interposed DIMM
DRAM
DIMM0
DIMM1
DIMM2
DIMM3
AMB
AMB In
LAI Mode
MCH
Showing only southbound FBD Links, but northbound follow same path in reverse.
5.1.1
LAI Mode Architecture
The diagram below illustrates the AMB as a functional block when used as a LAI. The
normal southbound and northbound links, the reference clock, and the SMB bus are
used “as is”. The channel traffic is reflected onto the DRAM interface with frame
alignment for access with a logic analyzer.
To be effective in collecting useful FBD traces, the information provided to a logic
analyzer must include not only a demuxed copy of the direct information transferred on
the links, but also several types of derived information that a logic analyzer is not
equipped to derive itself. These include specifically:
• Cross-triggering information with finer timing granularity than LA can achieve
• Simple filtering (qualified storage) opportunities recognition
• Traffic framing
54
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Figure 5-2. AMB LAI Mode Connectivity
AMB in LAI Mode
SMB
6
Reference clock
1 x2
To MCH or
next DIMM
to the North
Southbound In
Southbound Out
Northbound In
To next DIMM
to the South
10 x2
14 x2
10 x2
14 x2
Northbound Out
TRIG[10:0]
FRAME
CLK[p,n]
QUAL
4
1
Shared signals to
logic analyzer
1 x2
1
MODE
1
Shared signals to
other trace Bds
S[59:00]
N[83:00]
EV[3:0]
Southbound
and northbound
signals to
4
60
84
logic analyzer
5.1.2
5.1.3
LAI Mode Clocking
To eliminate frequency drifts, the AMB on each DIMM and the chipset in an FBD channel
will be provided with a reference clock that is from a clock source common to the FBD
channel. A clock buffer will be placed on the LAI card to take the reference clock input
and provide the required two reference clocks for the LAI AMB and the attached DIMM
AMB.
LAI Mode Pins
The DDR pins designed in the AMB can be enabled to carry signals for the logic analyzer
debug and validation of the FBD channel. The LAI mode is selected by strapping the
following input pins on a AMB which has the LAI capability bit enabled.
SA[:0] = DIMM ID = 4b’11XX
The list below highlights the pins in the AMB that are dedicated for DDR, all of which
are not required to operate at speed equal to the DDR data rate.
Address/Command pins are specially designed in the AMB to be able to drive double
data rate to support the LAI functionality.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
55
Debug and Logic Analyzer Mode
Table 5-1.
DDR Pins Shared With LAI Functionality
Use in LAI
Mode
Signal Type
Count
Speed (MHz)
Comment
DDR
DDR DQ & DQS
DDR Cmd/Addr
108
533/667
266/333
~ LAI signal
~ LAI signal
DQS must run single ended in LAI
mode
56
Most must run double speed in LAI
mode
Some may be dedicated to
bidirectional Event Bus
Clocks to DRAMs
8
533/667
analog
~ LAI signal
May run single ended in LAI mode
Not suitable for LAI signals
DDR Comp and analog
5
177
Total DDR Pins
Table 5-2.
List of Pins Required to Enable Debug With LAI Functionality
Signal Type
Southbound
Count
Speed (MHz)
Comment
S[59:0]
60
533/667
Data
Data
Northbound
N[83:0]
MODE
84
1
533/667
267/333
267/333
267/333
533/667
533/667
100
TRIG[10:0]
CLK
11
4
Two Differential pairs
QUAL
1
FRAME
1
EV[3:0]
Comp Pins
4
Bidirectional
5
Analog
Required for signal integrity
171
Total Pins
5.1.4
LAI Mode Signal Definitions
Table 5-3.
LAI Mode Added Signals (Sheet 1 of 2)
Signal Type
S[59:0]
Direction
Out
Definition
Southbound demuxed (6x10) traffic
Northbound demuxed (6x14) traffic
Link mode:
N[83:0]
MODE
Out
Out
0 = after training complete
1 = before training complete
TRIG[10:0]
Out
Triggers to LA. This provides eleven unique trigger signals to the
LA from the AMB LAI as a result of frame pattern matching, state
matching, and/or cross-triggering events from other LAIs. This
allows cooperating AMB LAIs to overcome (a) limitations of LA in
recognizing serial traffic patterns that exceed LA pattern
matching capabilities and, (b) relatively long latencies in cross-
triggering between LA modules.
56
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Table 5-3.
LAI Mode Added Signals (Sheet 2 of 2)
Signal Type
Direction
Out
Definition
CLK
Logic analyzer reference clock (differential). This provides a LA
compatible timing reference clock for capture of all signals to the
LA, with fine capture phase adjust using the native LA clock edge
offset capabilities.
QUAL
Out
Store qualifier:
1 = store
0 = do not store
FRAME
Out
I/O
Drives 1 when LAI pins are valid level. Should be connected to
pull down on LAI board to detect when LAI pins are tri-stated
and LA should ignore data.
EV[3:0]
Inter-AMB event bus for cross-triggering (wired-OR, high active,
slow).This four bit event bus allows multiple AMB (and similar)
LAIs to be programmed to inter-communicate locally detected
matching and/or filtering opportunities events (cross-triggering
and cross-qualification).
5.1.5
LAI to DDR Pin Mapping
Table 5-4 contains the LAI-to-DDR pin mapping.
Table 5-4.
List of Shared DDR/LAI Pins (Sheet 1 of 2)
DDR Pin
Count Speed Mbit/sec
LAI Mode
Comment
DQ[55:52], DQS[15],
DQS[15]
6
533/667
sbframe_data0[5:0],
[11:6]
5:0 captured on rising
edge of CLK,
11:6 captured on falling
edge of CLK
DQ[59:56], DQS[7],
DQS[7]
6
6
6
6
6
6
6
6
6
5
1
4
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
267/333
533/667
100 MHz
sbframe_data1[5:0],
[11:6]
DQ[51:48], DQS[6],
DQS[6]
sbframe_data2[5:0],
[11:6]
DQ[39:36], DQS[13],
DQS[13]
sbframe_data3[5:0],
[11:6]
DQ[47:44], DQS[14],
DQS[14]
sbframe_data4[5:0],
[11:6]
DQ[35:32], DQS[4],
DQS[4]
sbframe_data5[5:0],
[11:6]
DQ[43:40], DQS[5],
DQS[5]
sbframe_data6[5:0],
[11:6]
RASB, A[10:9)B,
DYBA[2:0]B
sbframe_data7[5:0],
[11:6]
A[6:2]B, A[0]B
sbframe_data8[5:0],
[11:6]
A[15:11],B A[8]B
sbframe_data9[5:0],
[11:6]
CKE[1:0]B, CS[1:0]B,
ODTB,
trigger[10:6]
Will only change at 1/2
freq
BA[2]A
frame
1 if transferring first half
of frame, 0 if second half
CASB, WEB, A[7]B,
A[1]B
evbus[3:0]
Inner DY bumpout rows
CASA
RASA
1
1
6
267/333
267/333
267/333
mode
qual
CKE[1:0]A, CS[1:0]A,
ODTA, WEA
trigger[5:0]
Will only change at 1/2
freq
Intel® 6400/6402 Advanced Memory Buffer Datasheet
57
Debug and Logic Analyzer Mode
Table 5-4.
List of Shared DDR/LAI Pins (Sheet 2 of 2)
DDR Pin
A[5:0]A
Count Speed Mbit/sec
LAI Mode
Comment
6
533/667
nbframe_data0[5:0],
[11:6]
5:0 captured on rising
edge of CLK,
11:6 captured on falling
edge of CLK
A[11:6]A
6
6
533/667
533/667
nbframe_data1[5:0],
[11:6]
BA[1:0]A,
A[15:12]A
nbframe_data2[5:0],
[11:6]
DQ[23:20], DQS[11],
DQS[11]
6
6
6
6
6
6
6
6
6
6
6
2
2
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
533/667
267/333 MHz
267/333 MHz
nbframe_data3[5:0],
[11:6]
DQ[31:28], DQS[12],
DQS[12]
nbframe_data4[5:0],
[11:6]
DQ[19:16], DQS[2],
DQS[2]]
nbframe_data5[5:0],
[11:6]
DQ[27:24], DQS[3],
DQS[3]
nbframe_data6[5:0],
[11:6]
DQ[15:12], DQS[10],
DQS[10]
nbframe_data7[5:0],
[11:6]
DQ[7:4], DQS[9],
DQS[9]
nbframe_data8[5:0],
[11:6]
DQ[11:8], DQS[1],
DQS[1]
nbframe_data9[5:0],
[11:6]
DQ[3:0], DQS[0],
DQS[0]
nbframe_data10[5:0],
[11:6]
CB[3:0], DQS[8],
DQS[8]
nbframe_data11[5:0],
[11:6]
CB[7:4], DQS[17],
DQS[17]
nbframe_data12[5:0],
[11:6]
DQ[63:60], DQS[16],
DQS[16]
nbframe_data13[5:0],
[11:6]
CLK[3:2]
nc
Not supported in LAI
Mode
CLK[3:2]
nc
Not supported in LAI
Mode
CLK[1:0]
2
2
267/333 MHz
267/333 MHz
LAI clock p [1:0]
LAI clock n [1:0]
CLK[1:0]#
162
No spare pins
Total DDR Pins
5.1.6
FBD to LAI Signal Mapping
The following example show how an FBD Southbound Command Frame is transferred
from FBD frame format to LA Interface early/late data.
The LAI interface delays the SB “A slot” by one clock to capture the FBD frame in the
same “ABC” slot format that is sent from the host - rather than the “BCA” (B and C slots
from host frame N-1 plus A slot from host frame N) used by the normal mode AMBs to
minimize latency on the decode of slot A commands.
58
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Table 5-5.
Typical FBD Southbound Command Frame
Bit
Transfer
\
9
8
7
6
5
4
3
2
1
0
N 0
N 1
N 2
N 3
N 4
N 5
N 6
N 7
N 8
N 9
N 10
N 11
aE0
aE1
aE7
aE6
aE5
aE4
0
aE8
F0=0
aC20
aC21
aC22
aC23
bC20
bC21
bC22
bC23
cC20
cC21
cC22
cC23
aC16
aC17
aC18
aC19
bC16
bC17
bC18
bC19
cC16
cC17
cC18
cC19
aC12
aC13
aC14
aC15
bC12
bC13
bC14
bC15
cC12
cC13
cC14
cC15
aC8
aC9
aC4
aC5
aC6
aC7
bC4
bC5
bC6
bC7
cC4
cC5
cC6
cC7
aC0
aC1
aC2
aC3
bC0
bC1
bC2
bC3
cC0
cC1
cC2
cC3
aE9
F1=0
aE2
aE10
aE13
aC10
aC11
bC8
aE3
aE11
aE12
FE21
FE20
FE19
FE18
FE17
FE16
FE15
FE14
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
bC9
0
bC10
bC11
cC8
0
0
0
cC9
0
cC10
cC11
0
Output to logic analyzer is lane by lane
early data
[lane 9][lane 1][lane0]
[FE20,FE21,….,aE0] ……… [bC5, bC4, aC7, aC6, aC5, aC4] [bC1, bC0, aC3, aC2, aC1,
aC0]
late data
[lane 9][lane 1][lane0]
[FE14,FE15,….,FE19] … … [cC7, cC6, cC5, cC4, bC7, bC6] [cC3,cC2, cC1, cC0, bC3,
bC2]
Note:
CRC codes in A cmd (aE0 - aE13) are a function of FE21:FE14 of previous frame.
5.1.7
LAI to DDR Pin Timing
The phases of data presented to the logic analyzer have some odd timing due to reuse
of some many different types of DDR I/O outputs to achieve the desired pin count. The
LA will compensate for these predictable phase offsets.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
59
Debug and Logic Analyzer Mode
Figure 5-3. LAI Signal Group Timing
CLK
LAI data
Cmd/Addr
early
data
late
data
LAI data
on DQ
early
data
late
data
LAI data
on DQS
early
data
late
data
Triggers
Cmd/Addr
trigger matched
to early/late data
Qual
qual on frame
5.1.8
LAI Features
5.1.8.1
Control and Status Registers (CSRs)
LAI mode CSRs will be accessed and programmed through SMBus when in LAI mode.
See Chapter 14, “Registers,” for complete details.
Note:
LAI registers cannot be accessed in-band over the FBD link
5.1.8.2
Pattern Matching
The LAI block can pattern match on three command values at any of three command
slots and combine the results into independent and combined local events. There are
13 total pattern matching events: a command value matches a command slot (9
events), a command value matches any slot (3 events), and all command values
appear in the frame (1 event).
This pattern matching is also used in normal mode for error injection and NB in-band
event generation.Figure 5-4 shows the LAI match and mask logic.
60
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Figure 5-4. LAI Match and Mask Logic
MM_12
AND
(full frame)
Match & Mask
Registers for
Cmnd #0
OR – match
0 in any pos
MM_11
MM_2
MMEVENT[2]
13:1 mux
Mask &
match A
Cmd slot
Combining
Results
& Reg.
A matches 0
B matches 0
C matches 0
13
13
Cmd
Qual
Logic
MM_5
MM_8
Early Southbound
Pipeline stage
Mask &
match B
Cmd slot
Combining
Results
& Reg.
MMEVENT[1
13:1 mux
Match
Events
Mask &
match C
Cmd slot
Combining
Results
& Reg.
Match & Mask
Registers for
Cmnd #1
MM_10
13
OR -match 1
in any pos
A matches 1
B matches 1
C matches 1
M&M CmdA
M&M CmdB
M&M CmdC
MM_1
MM_4
MMEVENT[0
13:1 mux
Cmd
Qual
Logic
MM_7
Match & Mask
Registers for
Cmnd #2
13
OR – match MM_9
2 in any pos
A matches 2
B matches 2
C matches 2
M&M CmdA
M&M CmdB
M&M CmdC
MM_0
MM_3
MM_6
Cmd
Qual
Logic
5.1.8.2.1
Additional Qualification on Match/Mask
Full frame and A-slot matching is enabled part way through TS0, once FBD inputs have
been aligned with the core clocking phases. Though generally, will not be used until link
has completed initialization.
Slot B and Slot C pattern matching is further qualified so that true commands can be
differentiated from data when not doing full frame matching.
For each mask and match pair 0, 1 or 2
• If Mask[39] = 1, then match and mask against any received data in Slot B and Slot
C.
• If Mask[39] = 0 AND Match[39] = 0 then only match on commands.
— Ignore a match with contents of Slot B if
Frame type is not Command or
Frame type is command and A-command is Sync or Soft Reset
— Ignore a match with contents of Slot C if
Frame type is not Command or
Frame type is command and A-command is Sync or Soft Reset or
B-command is Write Configuration Register
Intel® 6400/6402 Advanced Memory Buffer Datasheet
61
Debug and Logic Analyzer Mode
To match an FBD command that might occur in any slot including the A slot, mask out
bits [38:24] and set both Mask[39] and Match[39] to 0.
• If Mask[39] = 0 AND Match[39] = 1 then only match on memory write data.
— Match and mask against received data in slot B and slot C if
Frame type is Write Data Frame
5.1.8.3
Local Events
The mask/match features in the AMB LAI, and certain internal state and error
conditions, will be used to generate local events. Global events propagated through the
in-band debug and external event (EV) bus will also generate local events. All of the
local events can be selected by muxes as trigger sources for LAI event signals and
event bus signals. While not used in LAI mode, these events are also used in error
injection and for sourcing events in the NB status frames. For exact details see the
Configuration Registers Chapter.
An overview of the Local Events logic is shown below. The Match/Mask, Qualification
and Event Bus blocks are described in more detail in other sections.
Figure 5-5. Local Event Mux Block Diagram
Local Event Mux Block Diagram
Other
Qual logic
Qual
S
R
Q
Qual_start event
3
12
Local pattern
matching events
Qual_stop /
Inj_err event
MMEVENTSEL
Delay
Qual_flag
LAI Match and Mask Logic
LAI Qualification Logic
Local Event Muxes
Spare
Errors
Error injection control
0
31
Lai mode
30-25
Qual flag
24
18
SB IB debug events
EVBus in[3:0]
MMEVENT[2:0]
FBD link states
Null event
23-16
LAI trigger[10:0]
15-12
NB IB event control
11-9
8-1
0
0
4
Output
filter
EVBus out[3:0]
EVENTSELx,
EVBUS
1
EVBus[3:0]
4
Input filter
EVBus in[3:0]
EVBus Input and Output
Table 5-6 shows the 32 local events. Each of these local events is logged in a
configuration register and is sent to 19 32:1 muxes. The select lines for these muxes
are programmed in configuration registers. Table 5-7 shows the destination (intended
use) of the 19 selected events.
Table 5-6.
LAI Local Events (Sheet 1 of 2)
Sel
Addr
Name
Events
Description
Mask and Match
3
11:9
MMEVENT2:MMEVENT0
Slota, Slotb, Slotc, and Frame command matches - 3 events
preselected from 13 possible matches
In-band debug
EVBus events
8
4
23:16
15:12
Received on SB link in-band EV[7:0]
Received on select DDR pins Event Bus EV[3:0]
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Table 5-6.
LAI Local Events (Sheet 2 of 2)
Sel
Addr
Name
Events
Description
Initialization States
8
1:8
Disable[1], calibrate[2], training[3], testing[4], pollling[5],
config[6], l0[7], l0s or recalibrate[8]
Errors
6
30:25
•
•
•
•
•
•
SB/NB Fail Over mode [25], when unmasked:
SB CRC error[26],
Thermal overload[27],
Clock training violation (< 6 transitions in 512 UI) [28],
Unimplemented register access[29],
Other implementation specific errors[30]
For the Intel 6400/6402 Advanced Memory Buffer: event[30]
is the “OR“ of any bit in FERR[7:4] or NERR[7:4]
Qual_Flag
Spare
1
1
24
31
0
NOP
1
Null Event
32
For the Intel 6400/6402 Advanced Memory Buffer: There is
enough space for 32 events
Total Events
Table 5-7.
LAI Event Selection
Name
Events
Description
Output event/triggers
EVBus events
11
4
Sent to LA on DDR pins
Sent on DDR pins
Inject Event NB
Error Injection Trigger
Qual Events
1
Assert NB event bit - not necessarily LAI usage
Inject errors - not necessarily LAI usage
Start and stop events for qualification signal
1
2
19
Total Events
5.1.8.4
Event Bus
The AMB LAI mode enables four events signals (EV[3:0]) to be shared between the
AMB or compatible LAI devices in a system. The signals are shared through a uniquely
defined interconnect that connects all the devices to the 4-bit wide daisy chain bus. The
4 lanes are independent and carry separate events or triggers. Due to the noisy nature
of the interconnect between LAI devices, filtering is required to eliminate spurious
events from being introduced. A typical lane is shown in Figure 5-7 below.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
63
Debug and Logic Analyzer Mode
Figure 5-6. EVBus Overview
EV Bus System Topology
bus to
other LAI
Local
Events
Output
Filter
“1”ENB
EVBus
Event
Select
pin
EVBus
Local
Event
Input
Filter
Each lane in the bus can be selected by the EVTYPE parameter to be a pulse (trigger)
event or a level (qualifier) event. Timing for the input and output filters is set by the
EVT parameter which defines the Tmin in core clock cycles. Both of these parameters
reside in the EVBUS control register along with the local event select controls for each
lane in the bus.
Pulse mode timing:
Input: Inputs are digitally filtered to reduce spurious events from bus ringing. Once
a rising edge is detected a single one clock width pulse event is sent to the local
events. No further pulse events are permitted until the next rising edge that occurs
after the longer of either (2 * Tmin) or (T_source_event_actual + T min).
Output: An output high pulse of length Tmin or T_local event_actual (whichever is
longer) is sourced whenever triggered by the selected local event. This is followed
by an output low pulse of length Tmin. Further toggling by the selected local event
is ignored until this output sequence is complete.
Level mode timing:
Input: Once a rising edge is detected the local event is asserted and remains
asserted for Tmin or T_source_event_actual which ever is longer.
Output: An output high pulse of length Tmin or T_local event_actual (whichever is
longer) is sourced whenever triggered by the selected local event.
Figure 5-7 shows the event signal timing.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
Figure 5-7. Event Bus Signal Timing
Pulse EV Bus timing
Selected
Local
Event
Filtered
EVBus
Pulse Out
EVT
EVT
Received
EVBus
Signal
Filtered
EVBus
Pulse In
Local Event
Additional pulses filtered
out for period of at least
2 * EVT
Qualifier Level EV Bus timing
Selected
Local
Event
Filtered
EVBus
Pulse Out
Minimum Pulse = EVT
Received
EVBus
Signal
Filtered
EVBus
Pulse In
Local Event
Minimum Pulse = EVT
The signals will be driven or captured by four DDR I/O buffers.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
65
Debug and Logic Analyzer Mode
5.1.8.5
Qualification
The AMB in LAI mode sends a qualification signal, QUAL, on a DDR pin along with each
frame. A qualified frame contains data likely to be of interest to the user of the logic
analyzer. Conversely, an unqualified frame has been chosen to be filtered out because it
only contains idle NOP frames or has otherwise been “flagged” as not occurring
between pre-selected events. The logic analyzer can capture data when QUAL is
asserted, and ignore data when QUAL is deasserted.
Once a qualified frame is seen, the QUAL signal is asserted, and it remains asserted for
an additional programmable number of cycles, using a timer ranging from 0 to 63. This
timer is restarted if it is already running when a new qualified frame is seen.
The error injection timer will be used to push out the triggering of the QUAL_STOP
signal by N timer count of clock cycles (where N is user programmed for delay range of
0 to 63), thus increasing the length of the QUAL_FLAG interval. One QUAL_START
event will enable the assertion of QUAL_FLAG and another QUAL_STOP event will
disable assertion of QUAL_FLAG.
A frame of all NOPs is not a qualified frame. A sync frame is not a qualified frame if the
FILTER_SYNC configuration register bit is set; otherwise it is considered qualified.
Note:
The ability to determine which frames are qualified may be lost following an unmasked
CRC or Few Edges error. This is the result of the architected behavior that future
commands following the error will ignored. As a side effect, QUAL may stay high once
these errors are detected.
If the QUAL_MODE configuration register bit is set, frames must additionally occur
between QUAL_START and QUAL_STOP events to be qualified. A frame that triggers
QUAL_START may also cause the QUAL signal to assert, and a frame that triggers
QUAL_STOP will not be considered qualified. The QUAL_START and QUAL_STOP events
are programmable and are selected from the 32 local events.
Figure 5-8 is a block diagram of the qualification signal control logic.
Figure 5-8. LAI Qualification Signal Block Diagram
FILTER_SYNC
QUAL_PERIOD[5:0]
Format = cmd+wdata
Command A
Command <> SYNC
AND
input
1
0
load dec
>0
Command <> NOP
AND
OR
QUAL_MODE
QUAL
Command <> NOP
Command <> NOP
Command B
Command C
QUAL_START[4:0]
QUAL_FLAG
set
clr
Timer
0…63
local events
QUAL_STOP[4:0]
QUALSTOPDELAY[5:0]
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
5.1.9
LAI Block Diagram
Figure 5-9 is a block diagram of the LAI implementation.
The LAI block defines a frame from the host (not the AMB) point-of-view, so the slota
command is delayed by one core cycle relative to the slotb and slotc commands. The
southbound delay pipeline consists of one set of core registers for slota, and one set of
core registers for delayed slota, and slotb and slotc.
The protocol unwrapping and pattern recognition block takes the registered
southbound frame and detects and logs any local events. Events are selected in this
same cycle, registered on the core clock, and then forwarded to the DDR cluster. The
southbound frame is also registered once more and forwarded to the DDR cluster.
The northbound registers the line this data to the same clock domain as the
southbound data before it is forwarded to the DDR cluster.
Figure 5-9. Block Diagram of AMB in LAI Mode
AMB in LAI Mode
Remainder of path unmodified*
Southbound In
Reference clock
Southbound Out
S[59:00]
Retiming
Southbound
Delay
Q
Demux
Deskew
Registers
SMB
Protocol
&Pattern
CLK[p,n]
QUAL
Recognition
Q
Q
FRAME
Events
Selection,
&
EV[3:0]
Responses
TRIG[10:0]
Q
Q
MODE
Control/Status
Register
N[83:00]
Northbound
Delay
Q
Demux
Deskew
Registers
Northbound Out
Remainder of path unmodified*
Northbound In
Retiming &
Merge*
Intel® 6400/6402 Advanced Memory Buffer Datasheet
67
Debug and Logic Analyzer Mode
5.2
Normal Mode Debug Features
5.2.1
Normal Mode Debug Triggers
Southbound command matching/masking functionality may be available in normal AMB
operation. This can be used for triggering error injection or returning a signal in a
northbound status frame for debug/monitoring purposes for example.
5.2.2
Error Injection
Refer to the JEDEC publication: FB-DIMM Draft Specification: Design for Test, Design
for Validation (DFx) Specification for more information regarding Error Injection.
Selected errors of specific types may be injected internal to the AMB in response to
selected in-band events or by mask/match events from commands arriving at the AMB
. In the case of stuck lane errors, these are controlled directly via registers on the AMB
The AMB will also forward errors injected by the host into the SB link.
5.2.2.1
Types of Injected Errors
There are several types of errors that the AMB can inject in order to enable validation
and debug hardware and software mechanisms intended to deal with each error type in
operating systems.
5.2.2.1.1
Errors Injected in Northbound Command Register Read and Read Data Frames
In response to a selected local event, the AMB will inject an error in frame data after or
during calculating frame CRCs and transmitting the frame northbound. This is
necessary to test/validate/debug HW and SW mechanisms designed to detect and deal
with northbound channel soft (non-repeatable) channel transport errors.
Errors can be injected using the LFSR Idle pattern generator as a default.
5.2.2.1.2
5.2.2.1.3
Status Bits Injected in Status Block Sent Back in Response to Sync Command
In response to an FBD Sync command with R[1:0] = 2’b11, the AMB will return the
user written FBDS3 for the next status block returned in response to a Sync command.
Invalid Parity Injected in Status Block Sent Back in Response to Sync
Command
If the FBDS3.OVREN bit is set and FBDS3.USRPAR contains invalid parity for the data in
FBDS3.USRVAL, the in response to an FBD Sync command with R[1:0] = 2’b11 and,
the AMB will cause invalid parity to be passed in the next status a block returned in
response to a Sync command.
5.2.2.1.4
Force Alert
In response to a selected local event, the AMB will force the beginning of alerts
northbound. An error status bit indicating an injected alert error as the source will also
be set. This error may be created by artificially corrupting CRC on the frame whose
timing matches the error injection. This may have the same side effects as corrupting
the CRC but will have a different error status. The beginning of alerts northbound will
begin with the frame that would match read return slot for the corrupted frame.
For the Intel 6400/6402 Advanced Memory Buffer, the alert takes place 2 to 3 clocks
after the NB response for the SB frame that caused the trigger
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Debug and Logic Analyzer Mode
5.2.2.1.5
5.2.2.1.6
Selectively Force “Stuck On” Northbound Lanes
This capability is required to test ability of components and system to accomplish lane
fail-over. Note that this is the only error injection feature which is not event driven, but
rather shall be controlled directly by the STUCKL register in the AMB.
The selected lanes are “stuck” by being forced into “Electrical Idle”.
Sourcing Northbound In-Band Event
The northbound event shall be asserted in the next transmitted FBDS0 status block
following assertion of a selected local event. This approach allows any local event to be
propagated past a tracing AMB LAI monitoring the FBD channel as well as for use as an
event stimulus to the Host Interface logic.
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
69
Debug and Logic Analyzer Mode
70
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Errors
6 Errors
6.1
Types of Errors and Responses
The Intel 6400/6402 Advanced Memory Buffer (AMB) detects link errors that could lead
to data corruption. This includes CRC on commands and write data. The AMB also
prevents damage to the machine state.
6.1.1
FBD Link Errors
6.1.1.1
Link Initialization Errors
Table 6-1 shows link errors that can occur during initialization.
Table 6-1.
Link Errors in Initialization
Error
Response
Never come out of training state
Multi-lane failures - unable to
achieve bit lock on at least 9 of 10
SB lanes
Multi-lane failures - unable to
achieve bit lock on at least 12 NB
lanes
Never come out of training state
NB_Data_Merge_Disable - able to
achieve bit lock (pass thru link
data) but internal errors prevent
receiving valid link cmds or
merging data
Host sets NB_Merge_Disable bit in TS2 to cause DIMM to be in a pass-
thru mode both SB and NB - act as a blind repeater
1.
No attempt to decode commands, no response to link register RD/
WR, generate no alerts, neither generate or merge any NB traffic
SMBus access enabled
2.
Single Lane failure - SB and/or NB
Support normal initialization protocol and Fail Over mode if commanded
by host
Intel® 6400/6402 Advanced Memory Buffer Datasheet
71
Errors
6.1.1.2
Errors during Channel Operation
Table 6-2.
Link Errors in Normal Operation (Sheet 1 of 2)
Error
Response
CRC Error on SB frame
“A” Command - detected by 14-bit CRC (or
reduced 10-bit CRC in Fail Over mode)
If CMDCRC error type enabled in EMASK Register
1.
2.
3.
4.
5.
No command executed
120-bit Raw SB Frame captured in RECFBD Error Log Registers
Type of error logged in FERR/NERR registers
Error/Alert Asserted bit set in FBD Status 0 register
Ignore future commands except Soft Channel Reset until Soft Channel Reset or
Link Reset Received
Alert Frame sent continuously starting with NB frame in which returned data
pattern would be sent if aborted command had been a config read. Alert
patterns continue until Soft Channel Reset or Link Fast Reset received.
or
CRC Error on SB data or “BC” Commands
in Command Frame - detected by 22-bit
CRC (or reduced 10bit CRC in Fail Over
mode
6.
Note: Will NOT close DRAM pages or place DRAM into Self Refresh until detection
of Link Reset.
Else ignore error
Lose transition density on channel as
detected by no Sync in within 2 times the
SYNCTRAININT value (typically last 84
frames).
Note: Purpose of this error is not to
detect violation of required
If FEWEDGES error type enabled in EMASK Register
1.
2.
3.
4.
5.
6.
No command executed in expected Sync slot
120 bit Raw SB Frame captured in RECFBD Error Log Registers
Type of error logged in FERR/NERR registers
Error/Alert Asserted bit set in FBD Status 0 register
DDR Self Refresh FSM triggered to put DRAMs into Self Refresh
Ignore future commands including Soft Channel Reset until Link Reset
Received
Alert Frame sent continuously starting with NB frame in which returned data
pattern would be sent if aborted command had been a config read. Alert
patterns continue until Link Fast Reset received.
transition density (6 out of 512)
but to detect hang in the host and
put DRAM into self refresh. Any
corruption caused by lack of
transitions will be detected by
CRC violations.
7.
Else ignore error
Write Buffer Overrun
Write data received when FIFO is full
Overwriting the write buffer is a host error. The AMB does not take any action based
on an overrun. DRAM writes will proceed. What data item is written following an
overrun condition is not defined.
An overrun could be the result of channel errors, but these errors are detectable by
other means. Detection of an overrun condition is not required, but may be done by
implementation dependent means for debug.
Write Buffer Underrun:
not enough valid entries in Write FIFO to
support write data to memory
Underrunning the write buffer is a host error. The AMB does not take any action
based on an underrun. DRAM writes will proceed. What data item is written
following an underrun condition is not defined.
An underrun could be the result of channel errors, but these errors are detectable
by other means. Detection of an underrun condition is not required, but may be
done by implementation dependent means for debug.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Errors
Table 6-2.
Link Errors in Normal Operation (Sheet 2 of 2)
Error
Response
Access to unimplemented register
If UNIMPLCFG error type enabled in EMASK Register
1.
2.
3.
Drop Config Write cmds
Capture Addr in RECCFG register if not previously set
Return 0’s data if Config Read (or return -1 if Read addr to unimplemented
function - though currently expect all functions to be used)
UNIMPLCFG error type logged in FERR or NERR registers
Error/Alert Asserted bit set in FBD Status 0 register
4.
5.
Else ignore error
NOTE: The timing of the Error/Alert Asserted bit in FBD Status 0 response for an
unimplemented register is not guaranteed relative to the corresponding Sync/Status
boundaries. For example, if an unimplemented register access occurs in the frame
before a Sync frame, the Error Asserted bit in FBD Status 0 may not be asserted in
northbound Status corresponding to that Sync. But it will be asserted in a later
Status response.
Undefined command
Undefined commands with good CRC are ignored. This is not considered an error
condition, and is not logged. Treat as reserved command or Channel NOP
TID error on config writes
If the TID bit on a config write matches the value of the previous TID bit, the write
is ignored. The TID bit stored in the AMB is left unchanged in this case.
This error does not cause an alert frame, and is not logged.
The purpose of the TID bit is to allow the host to retry a config write command
following a fast reset if it does not know if it had been executed prior to an alert. If
the config write had occurred the TID bit will be the same, the retried write will be
ignored. If it had not occurred, the TID bit will be opposite, and the retried write to
will be executed.
6.1.2
DDR Errors
Table 6-3.
DDR Errors
Error
Response
Failure of software to achieve calibration
DDR voltage does not power up
This is detected through firmware during the calibration routine.
Firmware should treat the DIMM as a repeater if it is an intermediate DIMM or map
it out if it is the last DIMM in the chain
if normal FBD interface comes up, should at least act like a repeater. Does not bring
down FBD channel - like above. DDR cmds directed at DIMM will fail to return valid
responses.
6.1.3
Host Protocol Errors
AMBs are not expected to detect bad protocol from the host.
Table 6-4.
Host Protocol Errors
Error
Response
Illegal combinations of commands
AMB response to illegal command combinations is undefined
•
see Concurrent Command Delivery
Rules section of the FBD Architecture
and Protocol Specification
Commands to multiple AMBs to return
data in the same return frame.
If multiple AMBs attempt to return data in the same frame, the host will see the
data from the northern most AMB which is providing data, as it will replace any data
sent from AMBs to its south. A host controller should not produce commands which
would cause multiple AMBs to respond with data in the same frame. A special case
can occur where Alert frames are being sent by one or more AMBs while another
AMB is returning data from a command. These cases are discussed in the
Architecture and Protocol spec in the Northbound Alert Frame section.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
73
Errors
6.1.4
Other Errors
Table 6-5.
Other Errors
Error
Response
Overtemp - Temp > TEMPHI and overtemp If OVERTEMP error type enabled in EMASK Register
enabled
1.
2.
The OVERTEMP bit will be set in the FERR or NERR register as appropriate
Error/Alert Asserted bit set in FBD Status 0 register
If TEMPHIENABLE set in TEMPSTAT register also
3.
Shut down DDR channel:
•
Drive CKE low to the DRAMs and float the command, address, and data signals.
CKE, ODT, and clock continue to be driven. The clocks to the DRAMS may be
stopped after the CKE has been registered low
4.
5.
The FBD interface goes to electrical idle, with the receivers shut off to reduce
power.
The core will continue to be clocked, and the AMB will respond to SMBus
commands. This allows the host controller to determine the error condition
Note: No recovery expected, just trying to prevent Si meltdown
The AMB will remain in this state until the temperature is below TEMPHI and the
OVERTEMP bit is reset via SMBus or a hardware reset.
Else ignore error
Note: A hardware reset will place the TEMPHIENABLE bit in its default state of
disabled.
Injected alert
If INJCRC error type enabled in EMASK Register
1.
2.
3.
4.
5.
No command executed
120 bit Raw SB Frame captured in RECFBD Error Log Registers
Type of error logged in FERR/NERR registers
Error/Alert Asserted bit set in FBD Status 0 register
Ignore future commands except Soft Channel Reset until Soft Channel Reset or
Link Reset Received
6.
Alert Frame sent continuously starting with NB frame in which returned data
pattern would be sent if aborted command had been a config read. Alert
patterns continue until Soft Channel Reset or Link Fast Reset received.
Else ignore error
NOTE: this basically the same as a CRC error except that CRC is not actually
corrupted
Injected error
No REFCLK
If INJERR error type enabled in EMASK Register
1.
2.
Type of error logged in FERR/NERR registers
Error/Alert Asserted bit set in FBD Status 0 register
Else ignore error
Reset should not be released if no REFCLK present.PLL will not achieve lock, the
AMB will not come out of reset.
6.2
Error Logging
6.2.1
Error Logging Procedure
There are three basic types of errors in FBD: OverTemp, Alerts and Status Only
Errors.The first occurrence of any type of unmasked error are flagged in the FERR
register. Multiple bits can be set in this register if multiple errors occur in the same
clock period. Subsequent errors are flagged in the NERR register.
Unmasked “Alert” errors generate in-band link alert messages. All unmasked errors
also set the error bit in FBDS0 that is returned in regularly scheduled in-band status
response messages that occur following Sync commands.
There are error data logs associated with some of the errors. Once the first “Alert” error
has been flagged in the FERR or NERR (and matching SB frame data logged), the log
registers for that error remain locked until either 1) all “Alert” error bits in the FERR
and/or NERR are cleared, or 2) a power-up reset. Once the first Unimplemented
74
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Errors
Configuration Register Access error has been flagged (and matching address logged),
the log registers for that error remain locked until either 1) that bit in the FERR and/or
NERR cleared or 2) a power-up reset.
6.3
6.4
Fail Over Mode Support
The AMB supports single lane Fail Over mode as described in the FB DIMM Architecture
and Protocol Specification,. This is done under host control or through the SMBus.
Failback to Pass-Thru
In general, the AMB attempts to minimize the number of Single Points Of Failure
(SPOF) that could bring down the entire channel. Errors in any one lane can be mapped
out with Fail Over. Errors on the DDR interface can be handled by disabling the DRAM
interface and leaving the AMB in a repeater like mode. The goal is to allow the system
(following a reset or fast reset sequence) to work around the bad DIMM and keep the
DIMMs downstream in operation until there is time for system maintenance.
A AMB in an intermediate DIMM should continue to operate in pass-thru mode so that
NB and SB data are relayed to the next links in the channel with minimal functionality.
Only the following parts of the AMB need to be healthy to support this mode:
• Clock inputs and PLL circuitry to generate FBD clocks
• Minimal core logic around FBD I/O enabling and reset
— Reset generation
— Bit lock detection.
• at least N-1 FBD lanes operational in NB and SB channels
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
75
Errors
76
Intel® 6400/6402 Advanced Memory Buffer Datasheet
SMBus Interface
7 SMBus Interface
The Intel 6400/6402 Advanced Memory Buffer (AMB) has configuration registers that
provide flexibility and allow for testing and optimization of the chip. Upon system reset
(RESET#), configuration registers are reset to predetermined default states,
representing the minimum feature set required to successfully bring up a nominal
channel. It is expected that the BIOS will properly determine and program the optimal
configuration settings.
For all of these registers, the AMB supports register access mechanisms through SMBus
as well as through in-band channel commands.
7.1
System Management Access
System Management software in the platform can initiate system management access
to the configuration registers. This can be done through SMBus accesses.
The mechanism for the Server Management (SM) software to access configuration
registers is through a SMBus Specification, Rev. 2.0-compliant slave port. The AMB
contain this slave port and allow access to the configuration registers.
SMBus operations are made up of two major steps: (1) writing information to registers
within each component and (2) reading configuration registers from each component.
The following sections will describe the protocol for an SMBus master to access a AMB’s
internal configuration registers. Refer to the SMBus Specification, Rev. 2.0 for the bus
protocol, timings, and waveforms.
7.1.1
SMBus 2.0 Specification Compatibility
The principal requirement from the SMBus 2.0 specification is support of the “high
power” bus electrical specifications described in the layer 1 (Physical layer) chapter.
For the simple register access requirements of FBD, no layer 2 (Link layer) or layer 3
(Network layer) extensions provided by the 2.0 specification are used. In particular,
there is no support for Address Resolution Protocol (ARP) since FBD is using fixed
addresses. Additionally, only a subset of the network packet protocols described in the
specification are needed and these are described below.
AMB’s are required to support read and write transactions without requiring clock
stretching in order to simplify host controller requirements. For similar reasons, AMB’s
should not master SMBus transactions in normal operation.
7.1.2
Supported SMBus Commands
The AMB SMBus Rev. 2.0 slave ports support register reads and writes built out of the
following SMBus primitive commands:
The slave address for each primitive SMBus transaction are determined from the SA
pins.
• For normal FBD DIMMs:
— Slave Address[6:3] = 4’b1011
— Slave Address[2:0] = SA[2:0]
Intel® 6400/6402 Advanced Memory Buffer Datasheet
77
SMBus Interface
• For repeaters or LAI AMBs:
— Slave Address[6:3] = 4’b0011
— Slave Address[2:0] = SA[2:0]
Each SMBus transaction has an 8-bit command driven by the master. The format for
this command is illustrated in Table 7-1 below.
Table 7-1.
SMBus Command Encoding
7
6
5
4
3:2
1:0
Internal Command:
SMBus Command:
00 - Read DWord
01 - Write Byte
10 - Write Word
11 - Write DWord
00 - Byte
01 - Word
10 - Block
11 - Rsvd
Begin
End
Rsvd
PEC_en
The Begin bit indicates the first transaction of a read or write sequence.
The End bit indicates the last transaction of a read or write sequence.
The PEC_en bit enables the 8-bit PEC generation and checking logic.
The Internal Command field specifies the internal command to be issued by the SMBus
slave logic. Note that the Internal Command must remain consistent (that is, not
change) during a sequence that accesses a configuration register. Operation cannot be
guaranteed if it is not consistent when the command setup sequence is done.
The SMBus Command field specifies the SMBus command to be issued on the bus. This
field is used as an indication of the length of transfer so the slave knows when to
expect the PEC packet (if enabled).
Reserved bits should be written to zero to preserve future compatibility.
7.1.3
FBD AMB Register Access Protocols
Sequences of these basic commands will initiate internal accesses to the component’s
configuration registers.
Each configuration read or write first consists of an SMBus write sequence which
initializes the register’s address. The term sequence is used since these variables may
be written with a single block write or multiple word or byte writes. Once these
parameters are initialized, the SMBus master can initiate a read sequence (which
performs a configuration read) or a write sequence (which performs a configuration
write).
Table 7-2.
SMBus Protocol Addressing Fields
Address Field
Bits
Description
Name
Reserved
7:0
4:0
2:0
7:0
7:0
Reserved - AMB may alias all these addresses to 00h
Reserved - AMB may alias all these addresses to 00h
Function Address
Dev
Function
Reg_Num[15:8]
Reg_Num[7:0]
Reserved - AMB may alias all these addresses to 00h
Register Address within Function
78
Intel® 6400/6402 Advanced Memory Buffer Datasheet
SMBus Interface
7.1.3.1
Configuration Register Read Protocol
Configuration reads are accomplished through an SMBus write(s) and later followed by
an SMBus read. The write sequence is used to initialize the Bus Number, Device,
Function, and Register Number for the configuration access. The writing of this
information can be accomplished through any combination of the supported SMBus
write commands (Block, Word, or Byte). The Internal Command field for each write
should specify Read DWord.
After all the information is set up, the last write (End bit is set) initiates an internal
configuration read. If an error occurs during the internal access, the last write
command will receive a NACK. A status field indicates abnormal termination and
contains status information such as target abort, master abort, and time-outs. The
status field encoding is defined in the following table.
Table 7-3.
Status Field Encoding for SMBus Reads
Bit
Description
7
Reserved
6
Reserved
5
Reserved
4
Internal Target Abort
Reserved
3:1
0
Successful
Examples of configuration reads are illustrated below. All of these examples have PEC
(Packet Error Code) enabled. If the master does not support PEC, then bit 4 of the
command would be cleared and there would not be a PEC phase. For the definition of
the diagram conventions below, refer to the SMBus Specification, Rev. 2.0. For SMBus
read transactions, the last byte of data (or the PEC byte if enabled) is NACKed by the
master to indicate the end of the transaction. For diagram compactness, “Register
Number[]” is also sometimes referred to as “Reg Number” or “Reg Num”.
Figure 7-1. SMBus Configuration Read (Block Write / Block Read, PEC Enabled)
S
X011_XXX
W A
Cmd = 11010010
A
Byte Count = 4
A
Reserved
A
Device/Function
A
Reg Number[15:8]
A
Reg Number [7:0]
A
PEC
A P
S
X011_XXX
X011_XXX
W A
Cmd = 11010010
Byte Count = 5
A
A
Sr
R
A
Status
A
A
Data[31:24]
Data[7:0]
A
A
Data[23:16]
A
N P
PEC
Data[15:8]
The following example uses byte reads.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
79
SMBus Interface
Figure 7-2. SMBus Configuration Read (Write Bytes / Read Bytes, PEC Enabled)
S
S
S
S
X011_XXX
X011_XXX
X011_XXX
X011_XXX
W
W
W
W
A
A
A
A
Cmd = 10010000
Cmd = 00010000
Cmd = 00010000
Cmd = 01010000
A
A
A
A
Reserved
Device/Function
Register[15:8]
Register[7:0]
A
A
A
A
PEC
PEC
PEC
PEC
A
A
A
A
P
P
P
P
S
X011_XXX
X011_XXX
W
R
A
A
Cmd = 10010000
Status
A
A
Sr
PEC
PEC
PEC
PEC
PEC
N
N
N
N
N
P
P
P
P
P
S
X011_XXX
X011_XXX
W
R
A
A
Cmd = 00010000
Data[31:24]
A
A
Sr
S
X011_XXX
X011_XXX
W
R
A
A
Cmd = 00010000
Data[23:16]
A
A
Sr
S
X011_XXX
X011_XXX
W
R
A
A
Cmd = 00010000
Data[15:8]
A
A
Sr
S
X011_XXX
X011_XXX
W
R
A
A
Cmd = 01010000
Data[7:0]
A
A
Sr
7.1.3.2
Configuration Register Write Protocol
Configuration writes are accomplished through a series of SMBus writes. As with
configuration reads, a write sequence is first used to initialize the Bus Number, Device,
Function, and Register Number for the configuration access. The writing of this
information can be accomplished through any combination of the supported SMBus
write commands (Block, Word or Byte).
On SMBus, there is no concept of byte enables. Therefore, the Register Number written
to the slave is assumed to be aligned to the length of the Internal Command. In other
words, for a Write Byte internal command, the Register Number specifies the byte
address. For a Write DWord internal command, the two least-significant bits of the
Register Number are ignored. This is different from PCI where the byte enables are
used to indicate the byte of interest.
After all the information is set up, the SMBus master initiates one or more writes which
sets up the data to be written. The final write (End bit is set) initiates an internal
configuration write. If an error occurred, the SMBus interface NACKs the last write
operation just before the stop bit.
Examples of configuration writes are illustrated below. For the definition of the diagram
conventions below, refer to the SMBus Specification, Rev. 2.0.
Figure 7-3. SMBus Configuration Double Word Write (Block Write, PEC Enabled)
A
Data[31:24]
ByteCount =8
A
Reserved
A
Device/Function
Data[16:8]
A
Reg Number[15:8]
Data[7:0]
A
Reg Number [7:0]
PEC
S
X011_XXX
WA Cmd = 11011110
A
A
Data[23:16]
A
A
A
A P
80
Intel® 6400/6402 Advanced Memory Buffer Datasheet
SMBus Interface
Figure 7-4. SMBus Configuration Double Word Write (Write Bytes, PEC Enabled)
S
S
S
S
S
S
S
S
X011_XXX
X011_XXX
X011_XXX
X011_XXX
X011_XXX
X011_XXX
X011_XXX
X011_XXX
W
W
W
W
W
W
W
W
A
A
A
A
A
A
A
A
Cmd = 10011100
Cmd = 00011100
Cmd = 00011100
Cmd = 00011100
Cmd = 00011100
Cmd = 00011100
Cmd = 00011100
Cmd = 01011100
A
A
A
A
A
A
A
A
Reserved
Device/Function
Register[15:8]
Register[7:0]
Data[31:24]
Data[23:16]
Data[15:8]
A
A
A
A
A
A
A
A
PEC
PEC
PEC
PEC
PEC
PEC
PEC
PEC
A
A
A
A
A
A
A
A
P
P
P
P
P
P
P
P
Data[7:0]
Figure 7-5. SMBus Configuration Word Write (Block Write, PEC Disabled)
A
ByteCount =6
A
Reserved
A
Device/Function
Data[16:8]
A
Reg Number[15:8]
Data[7:0]
A
Reg Number [7:0]
S
X011_XXX
WA Cmd = 11001010
A
A
A P
Figure 7-6. SMBus Configuration Byte Write (Write Bytes, PEC Disabled)
S
S
S
S
S
X011_XXX
X011_XXX
X011_XXX
X011_XXX
X011_XXX
W
W
W
W
W
A
A
A
A
A
Cmd = 10000100
Cmd = 00000100
Cmd = 00000100
Cmd = 00000100
Cmd = 01000100
A
A
A
A
A
Reserved
Device/Function
Register[15:8]
Register[7:0]
Data[7:0]
A
A
A
A
A
P
P
P
P
P
7.1.4
SMBus Error Handling
The SMBus slave interface handles two types of errors: internal and PEC. These errors
manifest as a Not-Acknowledge (NACK) for the read command (End bit is set). If an
internal error occurs during a configuration write, the final write command receives a
NACK just before the stop bit. If the master receives a NACK, the entire configuration
transaction should be reattempted.
If the master supports packet error checking (PEC) and the PEC_en bit in the command
is set, then the PEC byte is checked in the slave interface. If the check indicates a
failure, then the slave will NACK the PEC packet.
7.1.5
SMBus Resets
7.1.5.1
SMBus Transactions During FBD Link Fast Reset
When the FBD link transitions into Electrical Idle (disable state) from an active state,
this causes a “fast” reset of all non-sticky registers in the AMB. SMB transactions
underway during a “fast” reset will not complete normally.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
81
SMBus Interface
This is not a problem since SMBus accesses are only required prior to initial link turn-on
or for diagnostic access when a link can not be initialized. It is the host’s responsibility
to monitor for SMBus transactions during a fast reset and retry these transactions when
the link is stable.
An interrupted transaction will result in the AMB as slave not properly acknowledging
the Master. This protects write transactions. However, if a read transaction has
proceeded to the point where the slave no longer acknowledges the master, read data
can be lost when the SMBus state machine is reset. If PEC is enabled, this data loss will
be detected as a PEC error.
The host restricting usage of SMBus to when the link is idle or monitoring “fast resets”
and retrying transactions that are interrupted is the safest SMBus access method.
7.1.5.2
SMBus Interface State Machine Reset
The slave interface state machine can be reset by the master in two ways:
• The master holds SCL low for 25 ms cumulative. Cumulative in this case means
that all the “low time” for SCL is counted between the Start and Stop bit. If this
totals 25 ms before reaching the Stop bit, the interface is reset.
— Timing is set up to be:
* 30 ms at DDR2-667
* 37.5 ms at DDR2-533
• The master holds SCL continuously high for 50 µs.
— Timing is set up to be:
* 60 µs at DDR2-667
* 75 µs at DDR2-533
7.1.5.3
SMBus Transactions During Hard Reset
Since the configuration registers are affected by the reset pin, SMBus masters will NOT
be able to access the internal registers while the system is reset.
§
82
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Clocking
8 Clocking
8.1
Intel 6400/6402 Advanced Memory Buffer (AMB)
Clock Domains
There are three main clock domains in the Intel 6400/6402 Advanced Memory Buffer
(AMB). The FBD (Fully-Buffered DIMM) link domain is a 12x multiple of the core clock.
The DDR data-rate domain is 2x the core clock. The core domain frequency equals the
DDR command-rate, and is a 2x multiple of the external reference clock. The ratio
between these domains remains fixed.The AMB logic in each domain is shown in
Figure 8-1.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
83
Clocking
Figure 8-1. AMB Clock Domains
10/17/03
AMB Block Diagram
SOUTH
10x2
10x2
NORTH
Southbound
Data In
Southbound
Data Out
Data M erge
2x CA DDR
Re-Tim e
1x DDR/Core
2x DDR + 2xbar
Re-synch
PLL
1x2
Reference Clock
1x Rd DDR
1x fixed/
HVM
4 phases of 6x
FBD
PISO
demux
10*12
Frame
clks and
state
State
and
control
RefClk
10*12
Reset#
Reset
Control
mux
Link Init SM
and Control
Reset
s
Init
patterns
SB Link
CSR’s
4
4
IBIST/DFX -
TX
DRAM Clock
IBIST/DFX - RX
D SET
Q
failover
SBLAI Buffer
2 deep x 120
DRAM Clock #
LAI data
CLR Q
LAI Match and
Mask
Command
Decoder &
CRC Check
DRAM
Cmd
29
29
Cmd Out
DRAM Address /
Command Copy1
D
SET Q
Thermal
Sensor
Q
CLR
DRAM Address /
Command Copy2
DDR
DDR State
Link
Controller
CSR’s
LAI data
Core Control:
NB/SB Combined Init
Reset control
CSR chain control
Data Out
DSET
Q
Internal debug control
36
deep
Q
CLR
72 + 18x2
Write
Data
FIFO
DRAM
Data / Strobe
External MEMBIST
DDRCalibration &
DDR IOBIST/DFX
Data In
Q SET
D
Q
Data CRC Ge n
CLR
& Read FIFO
Sync & Idle
Pattern
Generator
NB LAI Buffer
1 deep x 168
LAI data
IBIST/DFX -
RX
IBIST/DFX -
TX
Init Patterns
mux
Link Init SM
and Control
NB Link
CSR’s
failover
State
and
control
Frame
clks and
state
14*12
demux
14*6*2
PISO
LAI
Controller
5
5
SMBus
JTAG
SMbus
Controller
Re-synch
Re-Tim e
JTAG
Controller
Data Merge
Northbound
Data In
Northbound
Data Out
14x2
14x2
84
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Clocking
8.2
PLL Clocks
The PLL receives a reference clock at 1/2X, where X is the DDR command frequency.
The PLL generates the internal clocks shown below in Table 8-1.
Table 8-1.
PLL Clocks
Clock
Notes
DDRCA1X
This clock is unused in the AMB. It is still used for setting the alignment of the DDRCA2X clock
within the PLL.
DDRCA2X
DDR1X
Rising edge aligned to DDRCA1X. Also allows command/address bus to run at DDR data rate
in LAI mode.
Along with DDR2X and DDR2X#, used by DDRI/O cluster to generate DDR command clock,
DDR DQS output, and DDR DQ output. This is also used as core clock.
DDR2X
Rising edge aligned to DDR1X
Inverted DDR2X
DDR2X#
DDRRD1X
Used by DDRI/O cluster to advance the DDR Read FIFO read-pointer. It is also by Northbound
logic. This is driven by an independent divider and can be moved w.r.t to the core clock in 2UI
increments to align it with the DDR data availability.
HVMCLK
This is a fixed clock at the same frequency as the core clock but is driven by a independent
divider.
FBDCK (4)
Four phases of 6X clock. Provided to FBD Northbound, Southbound high-speed I/O clusters.
These signals are connected by abutment.
There are additional PLL modes used for testing and bring up. Details are in Section
8.9, “Additional Clock Modes” on page 87.
8.3
Reference Clock
A low-jitter differential reference clock (REFCLK) is routed to the host and each DIMM
from a common clock source on the system board. This reference clock uses HCSL
(High-Speed Current Steering Logic) signaling and its detailed requirements are
documented in the FB-DIMM Draft Specification: High Speed Differential P2P Link at
1.5V. The AMB uses the reference clock to generate internal buffer clocks and to
generate the clocks to the DRAMs located on each DIMM. The frequency of the
reference clocks (133 to 200 Mhz) is one half the frequency of the DRAM base clock
(267 to 400 Mhz), that is, it is one half the command-rate of the DRAM devices located
behind the AMB. For example, for DDR2 667 DRAM devices the reference clock
frequency would be 167 MHz. The reference clock is the basis for the various Core, FBD
and DDR internal clocks.
It is a requirement for the FBD channel to operate in the presence of Spread Spectrum
Clocking (SSC), which is commonly used to reduce EMI. The reference clocks for FBD
have to meet a jitter specification.
The reference clocks to the host and each DIMM are mesochronous, that is, they have
an unknown but fixed phase relationship to each other or the memory channel. This
simplifies PCB routing since no precise length matching is required. However an upper
bound for the clock length mismatch is necessary since the maximum phase difference
between the data sent out with the transmitter clock and the receiver clock needs to be
limited in the presence of SSC. It is required that all the reference clocks for a given
FBD channel originate from a single clock source, for example, a common clock
synthesizer or clock oscillator, and travel through the same jitter spectrum modifying
components (for example, PLL clock buffer) thereby ensuring that there is no frequency
mismatch or frequency drift between FBD agents.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
85
Clocking
The PLL will also operate with the REFCLK at 100 MHz during special transparent mode
testing. Since there is no high speed link operation, there can be looser requirements
for jitter and no SSC.
8.4
FBD Lane Frame Clocks
Each FBD I/O lane also sources a frame clock at core frequency that is matched to the
parallel data sourced by the lane. These are used during initialization to capture data in
training sequences and to align data across the link.
8.5
Clock Ratios
The core, DDR and FBD link clock domains are fixed in a 1:2:12 ratio. The SMBus
asynchronous subsystem need not scale. The supported clock ratios are shown in
Table 8-2.
Table 8-2.
AMB Clock Ratios
FBD Link Data
DDR Data Rate Core Frequency
Ref Clk
FBD Link : Core
Core : DDR
Rate
3.2 Gb/s
4.0 Gb/s
533 Mb/s
667 Mb/s
266 MHz
333 MHz
133 MHz
167 MHz
12 : 1
12 : 1
1 : 2
1 : 2
8.6
8.7
DDR DRAM Clock Support
The DDR command clocks (CLK[3:0], CLK[3:0])are generated by the AMB. They operate at
1X the core frequency for DDR2.
The write strobes operate at the same frequency as the CLK/CLK signals. Write data
and check bits are aligned to both the rising and falling edges of the write strobe.
The source-synchronous read strobes operate at the same rates as the write strobes.
Each read strobe will be individually aligned with its portion of the data and check-bits.
SMBus
The SMBus clock is synchronized to the core clock. Data is driven into the AMB with
respect to the serial clock signal. Data received on the data signal with respect to the
clock signal will be synchronized to the core using a metastability hardened
synchronizer guaranteeing an MTBF greater than 107 years. When inactive, the serial
clock should be deasserted (High). The serial clock frequency is 100 kHz.
8.8
Clock Pins
Table 8-3.
Clock Pins (Sheet 1 of 2)
Pin Name
Pin Description
SCK
AMB clock
SCK
AMB clock (Complement)
analog power supply for PLL
analog ground for PLL
TAP clock
VCCAPLL
VSSAPLL
TCK
86
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Clocking
Table 8-3.
Clock Pins (Sheet 2 of 2)
Pin Name
Pin Description
SCL
SMBus clock
CKE[1:0]{A,B}
CLK[3:0]
CLK[3:0]
DQS[17:0]
DQS[17:0]
DDR clock enables
DDR clocks
DDR clocks (Complements)
DDR data/check-bit strobes
DDR data/check-bit strobes (Complements)
8.9
Additional Clock Modes
8.9.1
Transparent Mode Clocking
In transparent mode, all input signals are registered in the core clock domain and all
outputs are driven from the output of registers clocked by core clock. In order to
achieve determinism on a tester in this mode, the feedback clock for the PLL is taken
from the end of the core clock tree. This makes all timing relative to the input reference
clock.
8.10
PLL Requirements
8.10.1
Jitter
The FBD link clocks are produced by a PLL that multiplies the SCLK frequency. See the
High Speed Differential Point-to-Point Link at 1.5 V for Fully Buffered DIMM
Specification and the Circuit Architecture Specifications for the DDR, FBD and PLL
custom I/Osfor more details.
8.10.2
8.10.3
PLL Bandwidth Requirements
The PLL -3dB loop bandwidth shall be between fREFCLK/18 and fREFCLK/6 with a 3dB
maximum peaking.
See the High Speed Differential Point-to-Point Link at 1.5 V for Fully Buffered DIMM
Specification and the Circuit Architecture Specifications for the DDR, FBD and PLL
custom I/Osfor more details.
External Reference
The PLL uses an external reference clock - described previously.
See the High Speed Differential Point-to-Point Link at 1.5 V for Fully Buffered DIMM
Specificationand the Circuit Architecture Specifications for the DDR, FBD and PLL
custom I/Os for more details.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
87
Clocking
8.10.4
Spread Spectrum Support
The AMB PLL will support Spread Spectrum Clocking (SSC). SSC is a frequency
modulation technique for EMI reduction. Instead of maintaining a constant frequency,
SSC modulates the clock frequency/period along a modulation profile.The AMB is
designed to support a nominal modulation frequency of 30-33 kHz with a downspread
of 0.5%.
See the High Speed Differential Point-to-Point Link at 1.5 V for Fully Buffered DIMM
Specification and the Circuit Architecture Specifications for the DDR, FBD and PLL
custom I/Os for more details.
8.10.5
8.10.6
Frequency of Operation
The PLL’s support a range of operation that exceeds the AMB’s functional range. This
allows the AMB to be tested at a higher frequency than the maximum specification to
provide test guardband. Lower frequencies are supported to allow system debug. The
PLL will also operate with the REFCLK at 100 MHz during transparent mode testing.
RESET#
The externally generated RESET# signal indicates when the core voltage is up and
reference clocks are stable. The core will use an asserted RESET# to asynchronously
put the AMB in reset, and to hold the AMB in reset. For details see the reset chapter.
External clocks dependent on PLL’s are DDR clocks and strobes, and SMBus clock.
8.10.7
Other PLL Characteristics
The PLL VCOs oscillate continually from power-up. At all other times, PLL output
dividers track the VCO, providing pulses to the clock trees. Logic that does not receive
an asynchronous reset can thus be reset “synchronously”.
A “locked” PLL will only serve to prove that the feedback loop is continuous. It will not
prove that the entire clock tree is continuous. The PLL is disabled for leakage test.
88
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Clocking
8.11
Analog Power Supply Pins
The incorporates one PLL. This PLL requires an Analog VCC and Analog Vss pad.
Therefore, there will be external LC filters for the AMB .
Figure 8-2. FBD PLL Power Supply Filter
VCC
VCCA
bump
0805
VCCA
pin
VCCA
Connected
to PLL
Package Routing
Circuitry
C1
10UF
6.3V
C2
10UF
6.3V
VSS
bump
0805
0805
Connection
in Metal 6
VSSA
Package Routing
VSSA
pin
VSSA
bump
Board
Package
Die
Separate filtered power pins are available for use by a PLL if needed.
Warning:
The filters are NOT to be connected to board Vss. The ground connection of the filters
will be routed through the package and grounded to on-die Vss.
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
89
Clocking
90
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Reset
9 Reset
This chapter describes aspects of hardware reset specific to the Intel 6400/6402
Advanced Memory Buffer (AMB).
9.1
Platform Reset Functionality
The FBD channel provides a RESET# signal to initialize all AMBs on the channel. The
generation of this signal is platform dependent, and may be asynchronous to the clock.
The platform will assert RESET# at power up. This signal may be asserted at other
times, such as a warm boot.
It is possible that platform conditions cause RESET# to be asserted at any time,
including in the middle of DRAM commands. This could occur during a warm boot.
Under these conditions, the AMB will be reset and the contents of memory are not
guaranteed. The state of the DRAMs must be guaranteed when reinitialized for proper
response.
9.1.1
Platform RESET# Requirements
• RESET# must be asserted at power up, and may also be asserted at other times
such as a warm boot. Asserting RESET# at warm boot will clear all error logging
registers.Asserting RESET# only at power up will allow error logging registers to be
maintained through a warm boot cycle.
• Asserting RESET# at warm boot will clear all error logging registers.
There is no need to delay or lockout RESET# going to the FBD channel since the AMB
will guarantee that the tDelay parameter is met. Reference Clocks must remain stable
for at least 4 clock cycles after RESET# is asserted in order to allow the AMB to satisfy
the tDelay requirement.
• RESET# must be asserted during power up, and for a minimum of 1 mS after the
FBD channel power and reference clocks SCK/SCK are stable.
• RESET# must be asserted for a minimum of 100 uS. This will only apply if RESET#
is re-asserted while power and clocks remain stable.
• After initial power on, if the reference clock frequency is changed while Reset is
asserted, reset must not be deasserted until power and reference clocks SCK/SCK
have been stable for at least 1 ms.
9.1.2
RESET# Requirements
RESET# is asynchronously applied to all storage elements. Assertion of RESET# does
not effect AMB PLL operation. Internal clocks continue to run.
Upon assertion of RESET#:
• DRAM CKE is driven low asynchronously with minimal delay (within 1 clock, asynch
path from reset to CKE).
• DRAM CLK/CLK continue to run with no short pulses generated within the tDelay
period specified in JEDEC ballot 1410.01.
• DRAM CLK/CLK may be stopped after the tDelay has been satisfied.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
91
Reset
• All internal register bits are set to their default values, including any error logging
bits that are normally not reset by the channel reset.
• The initialization FSM is put into the disable state. All internal state machines are
put in their default state.
• All southbound and northbound Tx outputs are put into electrical idle (EI) mode. All
Tx outputs stay in EI mode until the appropriate initialization state after
deassertion of RESET#.
9.1.3
Power-Up and Suspend-to-RAM Considerations
In a suspend to RAM environment the DRAMs are put into self-refresh mode, and the
FBD channel power may be removed. The DRAM power supply remains active. This
supply is used by the AMB DRAM interface I/O circuits. The AMB must keep the CKE
pins low, without glitches through this transition.
RESET# should be asserted before channel power goes away when entering S3.
DDR control and clock signals will be pulled low during initial power up. This may be
done with a voltage detection circuit. CKE must be maintained low during this time
without glitches to prevent the DRAMs from exiting self refresh mode. The RESET#
signal will remain low during the power-up sequence, for at least 1mS after power and
clocks are stable. The CKE signals must remain low until a command is received that
takes the CKE signals high. This could be an exit self refresh command, or any of the
DRAM CKE commands.
9.2
Reset Types
Types of reset:
• Hard resets occur when the RESET# signal is low. This usually occurs at power up.
• Fast resets occur when there is a reset event on the primary southbound FBD Link.
• SMBus resets affect only the SMBus interface.
9.3
Pads Controlling Reset
The AMB resets are controlled by the RESET# pad and the primary southbound FBD
link pads. The RESET# pad resets the chip at power up. When the primary southbound
FBD link pads indicate EI, a fast reset is started.
9.3.1
RESET# Pad
The low true RESET# pad is controlled by the platform which holds it low until after
power and SCK/SCK are stable. RESET# asynchronously resets most of the chip to a
safe initial state. The PLLs and TAP are not reset.When RESET# goes high, logic
running on REFCLK waits an appropriate amount of time and then resets the core. Logic
running on REFCLK is reset by RESET# directly. As the chip comes out of reset, the
Primary South FBD Link is expected to be in a reset state. As the link sequences
through the first initialization sequence after power up, the AMB will not generate any
DRAM commands other than to maintain CKE low and enable DRAM clocks at the
appropriate time.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Reset
9.3.2
Primary FBD Link
When an EI occurs on the primary southbound FBD link a fast reset is started. This
starts a handshake procedure putting the DRAMs into self-refresh mode and resetting
the AMB. Fast reset does not reset the PLL, sticky flops, and sticky configuration
registers.
9.4
Details
Reset details and sequences will be released in a future revision of this document.
9.4.1
Cold Power-Up Reset Sequence
1. 1.5 V, 1.8 V and 3.3 V power supplies comes up
• RESET# asserted low while power supplies are coming up
• CKE’s are low upon 1.8 V power up
2. BIOS queries SPD on all the FBDs on the channel to determine operating conditions
— channel frequency, compatible DIMMs, DRAM and AMB parameters
3. Clocks up and stable at required frequency
• Reference Clocks (SCK/SCK) should be stable at least 1ms before RESET#
deasserted for designs with PLL running independent of RESET#
• DRAM clocks (CLK/CLK) may be toggling at this time
4. RESET# deasserted high
• CKE’s to DRAMs remain low
5. No transactions for at least 200 us after RESET# deasserted for designs with PLL’s
tied to RESET#
• No SMBus or in-band activity during this period
• DRAM clocks should be stable at this time
6. AMB parameters critical for robust link initialization are programmed via SMBus
• Architected link registers
— LINKPARNXT: link frequency - Note: some AMBs may use this write to trigger
PLL init
— FBDSBCFGNXT: SB transmitter drive strength, de-emphasis setting and pass-
thru mode
— FBDNBCFGNXT:NB transmitter drive strength, de-emphasis setting and pass-
thru mode
— FBDBLTO:if NB lanes are to be deconfigured
• Personality Bytes from SPD needed for link initialization
— PERSBYTE[5:0]NXT:
In the AMB, these match:
— SPDPAR01NXT: various FBD IO implementation specific controls
— SPDPAR23NXT:various FBD IO implementation specific controls
— SPDPAR45NXT
— remaining Personality bytes are not required for link init and may be loaded
over the high speed FBD configuration register accesses
Intel® 6400/6402 Advanced Memory Buffer Datasheet
93
Reset
• These “Next” register values must be transferred to the matching “Current”
registers before the FBD link leaves the DISABLE state
— Updates may be done right after the NXT register is updated when link is in
electrical idle. Updates must be complete before the beginning of training.
7. FBD Link is initialized including CALIBRATION state.
8. Remaining AMB configuration is loaded over high speed FBD channel
• CMD2DATA, remaining personality bytes, other SPD parameters, DRAM
parameters, Errors enabled, and so forth.
9. FBD Link goes through fast reset (no CALIBRATION) to establish the desired
configuration
10.DRAM interface can now be established
a. MRS/EMRS setup using DCALCSR and DCALADDR
b. DRAM interface calibrated using DCALCSR
c. Optionally, MemBIST functionality can be used to test the DRAMs
d. DRAM’s can be initialized using MemBIST
11.Refresh must now be transferred to the host
• Option 1: Use fast reset on the link with DRAMs in self-refresh
— clear DSREFTC:DISSREXIT to enable fast self refresh exit when link is re-
established
— put the link in disable state which automatically puts the DRAMs in self refresh.
— Start the refresh engine on the host
— bring up the link again
— Host starts sending refresh commands as soon as L0 state reached
• Option 2: write control register to disable auto-refresh engine followed by
— Clear DAREFTC:AREFEN to turn off auto-refresh
— Host then immediately takes over sending refresh commands
12.Host now has complete control of the FBD Channel
9.4.2
S3 Restore Power-Up Reset Sequence
Follow steps 1) through 9) from cold power up sequence above. Step 2, BIOS query of
SPD may be skipped if these values are saved elsewhere. Either way the personality
bytes from the SPD are restored to their prior values in the AMB. Once this is done the
DRAM interface can be restored.
1. DRAM interface can now be restored
a. DRC, MTR, DSREFTC, and DAREFTC register restored
b. Stored S3RESTORE[15:0] are written back into each AMB
— do NOT recalibrate the DRAM interface using DCALCSR
— do NOT reinitialize the DRAMs using MemBIST
2. Refresh must now be transferred to the host as in cold power up
3. Host now has complete control of the FBD Channel and prior DRAM memory state
has been preserved.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Reset
9.4.2.1
Implementation Detail
1. The RESET# pad starts out low. This asynchronously asserts all internal resets.
2. After power comes up and REFCLK stabilizes, the PLLs start generating clocks. At
this time, the phase relations between the clocks are not guarantied to be correct.
3. RESET# rises. A synchronized version releases the reset on the logic running on
REFCLK. The chip monitors RESET# for 100 and 200 usec RESET# must remain
stable during this time. If it falls the wait starts again until a stable high occurs.
4. After a stable RESET# high is detected, the PLL is reset to bring the generated
clocks into correct alignment with themselves.
5. At this point the chip waits for the PLL to indicate reset complete. When it does, the
internal resets are deasserted for all clock domains except TCK.
9.4.3
Reset Sequence for a Fast Reset
Figure 9-1 below shows a fast reset sequence. Important steps are described below:
• The chip is running with the RESET# high and a full link initialization sequence has
been completed at least once.
• A electrical idle is detected on the primary Southbound FBD Link.
• If not the last DIMM, forward electrical idle Southbound to the next DIMM.
• Drive logic “0’s” on Northbound transmitters.
• The AMB completes the fast reset handshake (see below).
• Reset is asserted for all non-sticky registers.
• The values in the next fields are transferred to the Current fields.
• The PLL remains in lock but the clock outputs are reset, causing them to realign.
• IF not the last DIMM, the AMB waits for an electrical idle to appear on the
secondary Northbound FBD link.
• Forward electrical idle Northbound
• The chip is released from reset.
• Freezing sticky configuration registers through reset
9.4.4
Fast Reset Handshake
When a reset event is detected on the primary Southbound FBD link, the AMB does the
following:
• Immediately stops accepting new DRAM commands from the link.
• Halts all on-chip algorithms, including DRAM cal and MemBIST.
• Waits 200 ns for any in-process DRAM commands to complete.
• Asserts CKE high.
• Waits 200 ns for DRAM self-refresh exit to complete.
• Sends a DRAM precharge all to all ranks.
• Waits 30 ns for precharge all to complete.
• Sends DRAM self-refresh entry commands to all ranks
.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
95
Reset
9.4.5
Timing Diagrams
Figure 9-1. Cold Power-Up Reset
AMB Cold Power-Up Reset Sequence
Inputs to AMB
1.8 V supply
1.5, 3.3 V supplies
Ref clk
Stable
At least 2 msec
RESET#
At least 200 usec
SMBus
FBD link
Quiet
Pgm phys link regs
Disabled
Link init and cal AMB config EI
Link init
Bring up DRAM ifc
Outputs from AMB
CKE
DRAM clk
Stable
Nxt Æ Cur updated
by this time
Inputs: value irrelevant.
Outputs: value unknown
Figure 9-2. AMB Fast Reset Sequence
AMB Fast Reset Sequence
(DISSREXIT not Set)
Inputs to AMB
Power supplies and
Ref clk stable
RESET# high
Nxt Æ Cur updated
by this time
TS1
TS2
TS3
TS2
L0
L0
EI
TS0
L0
Primary SB FBD
TS1
TS3
Secondary NB FBD
EI
TS0
L0
0's
Outputs from AMB
TS1
TS2
TS3
Secondary SB FBD
Primary NB FBD
L0
EI
TS0
L0
TS1
TS2
TS3
EI
TS0
L0
L0
0's
Precharge All
& AutoRefresh
on-going
SRF Entry
SRF Exit
SRF Exit
DRAM Commands
CKE
DRAM clks
Stable
May change
Stable
Internal Signals
Non-Sticky Reset
0001
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Reset
9.5
I/O Initialization
9.5.1
FBD Channel Initialization
Channel initialization states and uses of fast reset are described in the FB-DIMM
Architecture and Protocol Specification.
9.5.2
DDR
Analog compensation commences at power-up. It’s completed by “RESET#”
deassertion. After the FBD link reaches L0 state, setting the DRC.CKEN configuration
bit enables CKE.The DDR interface is now ready for calibration.
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
97
Reset
98
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Transparent Mode
10 Transparent Mode
Figure 10-1 shows the typical architecture of a DRAM with a 4 bit wide data path. The
memory array operates at 100 to 200 MHz. With a pre-fetch of 4, there are 4 bits of
data on each array access, allowing us to clock data in or out at 400 MHz. This 4 to 1
multiplexing and de-multiplexing is performed in the input register or output
multiplexer.
Figure 10-1. DRAM Architecture
10.1
Transparent Mode
Refer to the JEDEC publication: FB-DIMM Draft Specification: Design for Test, Design
for Validation (DFx) Specification for information regarding transparent mode.
Transparent mode is designed to allow access to the DRAM behind the AMB. In this
mode high speed pins are converted into low speed pins and mapped to DRAM pins.
The objective is to allow the use of existing test equipment and manufacturing
processes. The tester must be capable of operation at 200 MHz. Transparent mode
offers potential improvements in test capacity over traditional DIMMs. In this mode,
FBD requires only 60 active pins to test the DIMM.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
99
Transparent Mode
Data from the tester is 16 bits wide at 200 MHz (single data rate). The data rate is
doubled and the width halved on the way to the DRAM (by clocking out 8 bits of data on
the rising edge of the clock and the remaining 8 bits on the falling edge).
The tester will drive data to be written to the DRAM on a write pass and data to be
compared on a read. DRAM data and the expected data from the tester is compared in
the AMB. If the actual and expected data differ the pass/fail outputs will indicate which
DRAM failed.
10.1.1
Block Diagram
The data paths for transparent mode will bypass all link logic and normal DRAM control
logic. The DDR interfaces are used intact. Figure 10-2 is a block diagram of the Intel
6400/6402 Advanced Memory Buffer (AMB) in transparent mode.
Figure 10-2. Block Diagram for the AMB in transparent mode
SET
SET
CLR
D
D
Q
Q
D
Q
Q
DRAM CMD/ADD
TCMD/TADD
CLR
SET
Shift Register
Q
Q
TDRV
Controlled by AMB CL, AL
or hard coded for WL=3
ENB
SET
CLR
D
Q
Q
CLR
SET
Multiplexer
D
Q
Q
TDQ
S1
D
16
144
CLR
S2
ENB
SET
CLR
D
Q
Q
C
ENB
DFTDATA
DRAMWR
DRAM DQ
DRAM DQS
Multiplexer
SET
CLR
Q
Q
D
Status
D
S1
DDR IO Read
Data FIFO
SET
CLR
Q
D
16
S2
Q
ENB
C
ENDOUT, DRAMRD
Read Pointer
Shift Register
Controlled by AMB CL, AL, CMD2DATA
or hard coded to RL=4 and CMD2DATA=4
SET
CLR
D
Q
Q
TCMP
ENB
10.1.2
Transparent Mode Signal Definitions
When the transparent mode is enabled. The FBD (Fully-Buffered DIMM) differential
input pins designed in the AMB part become two single ended inputs. In transparent
mode the FBD input pins require 0 to 500 mV swing (half of the normal differential
input voltage). Input slew rates should be approximately 5 V/ns. This parameter is not
critical, but it must be fast enough to be recognized by the AMB receiver. The DDR pins
will operate with normal DDR2 timings and levels.
The AMB clock input pins will be used for transparent mode as well as normal mode.
This also allows use of most of the existing on-chip clock distribution network.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Transparent Mode
Table 10-1. Additional Signals in Transparent Mode
Transparent
Mode Signal
Name
Pin Count
Frequency
Direction
Definition
TCKE[1:0]
TCS#[1:0]
TODT
2
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
In
In
In
In
In
In
In
In
In
In
In
In
Out
Controls CKE[1:0]{A,B}
2
1
Controls both ODT[1:0]{A,B}
Controls WE{A,B}
TRAS#
1
TCAS#
1
TWE#
1
TBA[2:0]
TA[14:0]
TDRV
3
15
1
Tester signal to drive data on writes
Tester signal to compare on reads
Early data to each byte
TCMP
1
TDQ[15:8]
TDQ[7:0]
8
8
Late data to each byte
TPF[8:0] or
TDQO[15:0]
9 or 16
Used for pass/fail (8:0) or direct access (15:0)
Sum of receivers
Sum of drivers
44
16
10.1.3
Transparent Mode to FBD Pin Mapping
The FBD pin mapping is shown in Table 10-2.
Table 10-2. Mapping of FBD Pins in Transparent Mode
Transparent Mode Signal
Name
FBD Pin Name
Count
Speed
Comment
SN[0], SN[0]
2
200 MHz
TCKE[1:0]
TCS#[1:0]
TODT
SN[1], SN[1]
SN[2],
2
1
1
1
1
3
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
SN[2]
TRAS#
SN[3],
TCAS#
SN[3]
TWE#
SN[4], SN[4]
SN[5]
TBA[2:0]
SN[13:6], SN[13:6]
PS[8]
16
1
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
200 MHz
TA[15:0]
TDRV
PS[8]
1
TCMP
PS[7:0]
8
TDQ[15:8]
TDQ[7:0]
TPF[8:0]
Early data
PS[7:0]
8
Late data
SS[8:0]
9
Pass/Fail mode
(TRANSCFG.ENDOUT =0)
PN[13:7],
SS[8:0]
16
200 MHz
TDQO[15:0]
Data output mode
(TRANSCFG.ENDOUT =1)
Total Pins
Intel® 6400/6402 Advanced Memory Buffer Datasheet
101
Transparent Mode
10.2
Transparent Mode Timing
10.2.1
Clock Frequency and Core Timing
The DDR2 DRAM clock frequency is 200 to 400 MHz but core timings require several
clocks (or nS) to complete.
For example on DDR2 667:
• tCL, tRP and tRCD are 4 clocks or 12 ns
• tRC is 57 ns
• tRRD is 7.5 ns
DDR2 transactions are burst-oriented, reading or writing 4 or 8 words of data across 4
or 8 clock edges. Assuming a 4 bit burst, a x8 DRAM will transfer 32 bits on successive
edges of 2 DRAM clock cycles. On the tester side of the interface the same 32 bits of
data is transferred, 16 bits at a time, over two DRAM cycles.
10.2.2
Edge Placement Accuracy
Command, address and data edges should be reasonably close to the appropriate clock
edge but with some margin of error. DRAM setup and hold times are 400 to 600 pS,
while the half cycle time is at least 1250 pS. As long as the data is within 625 pS of the
clock edge it will not violate setup or hold. Since there will be other error terms (DIMM
trace length matching, jitter, and so forth) it is recommended the tester be accurate to
±300 pS.
During Transparent mode testing, the core clock is tied to the input reference clock by
selecting a special mode in the PLL. Normally, the PLL uses an internal feedback loop
for maintaining lock. In this special mode, the end of the core clock tree is fed back as
the feedback clock to the PLL. This makes driving and receiving data at the pins of the
chip deterministic with respect to the reference clock. This feedback mode for the PLL
can be selected automatically in Transparent Mode.
10.2.3
Transparent Mode Timing
Normally, transparent mode will use DDR2-400 timing even if the DRAM is rated for
faster operation. Optionally an AMB may support operation at frequencies higher than
200 MHz.
To set up transparent mode the appropriate AMB registers should be set to AL=0, CL=4
and CMD2DATA=4. Some AMBs may default to these values, in which case
programming has no effect. These values establish an internal timing relationship as
illustrated in the following figures. Optionally other register values may be supported
for special test cases.
Actual placement of DRAM read/write or other commands is dependent on the incoming
signals, not the AMB register values. Figure shows an example of a write, read, write
sequence using incoming signals that correspond to WL=4 and RL=5. The timing
relationships in red (normal font) are fixed relationships (established by the AMB
register settings above). These edges will move together. The relationships in green
(italic font) are the DRAM timings, which are under control of the tester.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Transparent Mode
Timing may be changed on the fly (for example, in the middle of a test pattern) by
changing the placement of edges from the tester. DRAM mode registers can be
programmed on the fly as needed by including (E)MRS commands in the tester data
stream. There is no need to change AMB settings during a test. The only exception is
that DRAM BL may be changed on the fly but the data logging logic may get confused if
DRAM BL does not match the BL expected by the data logger. All other DRAM settings
such as AL and CL may be changed at any time.
Figure 10-1. Transparent Mode Timing
10.2.3.1
10.2.3.2
Write Timing
Figure 10-2 illustrates write timing with the tester set to WL=3, 4, and 5. There is a
constant offset of three cycles from TDRV to TDQ and one cycle from TDQ to DRAM DQ.
The DRAM mode registers must, of course, be set to the appropriate timing to
recognize the read. For BL=8 the TDRV pulse will be 4 clocks wide rather than 2.
Extended Write Timing
The TDRV pulse may be extended indefinitely in cases where it is necessary to apply
constant data to the DRAM pins. As long as TDRV remains asserted the AMB will
continuously propagate data from the tester TDQ inputs through to the DRAM DQ pins
(delayed by 1 cycle) as indicated below.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
103
Transparent Mode
Figure 10-2. Transparent Mode Write Timing
10.2.3.3
Read Timing
Figure 10-3 shows read timing with the tester set to RL=3 and RL=5. Due to
complexities in the handling of read data in an AMB there is a latency of several cycles
from the TDRV pulse to TDQ and test status outputs. Specifically there is a constant
latency of four cycles plus the programmed CMD2DATA value from TDRV to TDQ (8
cycles total using the AMB settings above) and one cycle from TDQ to DRAM DQ. An
AMB may support shorter latencies but this is not required.
TCMP is latched on the rising edge of core clock. This initiates the read inside the AMB.
In most cases the AMB will latch DRAM read data slightly before TDQ data is needed.
The reason is most AMBs will load DDR data into a queue in the DRAM domain and
unload the data on a core clock edge. TDQ is typically not needed until the DRAM data
is in the core. The comparison of actual and expected data and propagation back to the
tester will occur on the next core clock edge.
The timings below are for BL=4. When testing BL=8 the TCMP pulse should be 3 clocks
wide rather than 1. Tester DQ data, DRAM data and the status outputs will be extended
appropriately to cover the burst length.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Transparent Mode
Figure 10-3. Transparent Mode Read Timing
Figure 10-4. BL=8 Read Timing
Intel® 6400/6402 Advanced Memory Buffer Datasheet
105
Transparent Mode
10.2.4
Error Reporting
By default the status pins will be the xor of actual data from the DRAM and expected
data from the tester. The AMB also stores 144 bits of DQ data. If the LGFBITS control
bit is cleared the 144 bits of data will be actual data read from the DRAM. Otherwise
the result of the data compare is stored. In either case the tester must still provide
expected data for the AMB to properly set the status pins.
Normally the test will stop when an error occurs. It is the responsibility of the tester or
test program to track errors, read error registers and stop or continue as appropriate.
This may require multiple iterations of the same test to execute, collect data and re-
start the test.
10.2.4.1
Multiple Failures
There are some implications if multiple failures occur in the same DRAM burst. Three
control register bits determine how these failures should be captured. If the log first fail
(lgffail) bit is zero (default) the AMB will record only the last failure in a burst. When
the bit is set the AMB will record the first failure at the burst position matching the
burst position (bstpos) setting. If the bit is set and an error is logged, no further
logging will occur until the bit is cleared.
a) If a failure is detected only in one half of the burst (first and second or third and
fourth data words), the error pins will indicate which DRAM or DRAMs failed. The error
register will indicate which data lines failed and in which data words.
b) If a failure is detected in both halves of the burst (data word 1 or 2 and words 3 or
4), data from the second failure would overwrite data from the first failure. By default
this is prevented by the log fail bit. The error pins will continue to operate correctly. If it
is desired to collect data from a specific portion of the burst the burst position bits can
be used to select an appropriate burst position to record. For a 4 bit burst it is possible
to select data from the first or second half of the burst. For an 8 bit burst there are four
positions to choose from. These mappings are illustrated in the following figure.
Table 10-3. Mapping of Burst Position Bits to Error Capture
Log First Fail
Burst Position
BL=4
Bit0
0
Bit1
Bit0
x
1
2
3
4
x
0
0
144 bits*
144 bits
or 144 bits*
1
0
1
1
144 bits
Log First Fail
Burst Position
BL=8
Bit0
0
Bit1
x
Bit0
x
1
2
3
4
5
6
7
8
144 bits*
144 bits
or 144 bits*
or 144 bits*
or 144 bits*
1
0
0
1
1
1
0
1
144 bits
1
1
0
1
144 bits
144 bits
* The last failure will be saved in whatever burst position it occurs.
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Transparent Mode
10.2.4.2
Direct Access - Testing of Individual DRAMs
In certain cases it is desirable to test one or two DRAMs. Transparent mode allows
direct access to a single x8 or two x4 DRAMs. In this mode 8 DDR DQ pins are
demultiplexed onto 16 SDR status pins, providing16 bit input data path (on TDQ) and a
16 bit output data path on the status pins.
The transparent mode configuration register has one bit (ENDOUT) to enable this
mode. On reads, the DRAMRD bits will select the bytes of DRAM data to be presented
on the status pins. On writes the DRAMWR bits select a DRAM to receive data from the
TDQ bus. A separate register holds 8 bits of default data to be applied to non-selected
DRAMs in the early/even cycles and another 8 bits for late/odd cycles. The mapping of
these bits to DQ selection is illustrated in the following table.
Table 10-4. Selection of 8 bit Data Paths When ENDOUT is Set
Early Data
DQ Byte
Late Data
DQ Byte
DRAM RD/WR
DQ
0xF (DRAM WR only)
All Bytes
8
7
6
5
4
3
2
1
0
71:64
63:56
55:48
47:40
39:32
31:24
23:16
15:8
8
7
6
5
4
3
2
1
0
17
16
15
14
13
12
11
10
9
7:0
DRAMWR is the byte of data bus selected to receive transparent write data, and byte of
data bus to be compared against transparent read data. DRAMWR allows a setting of
0xF (all ones) which sends the TDQ input data to all DQ bytes. DRAMRD is the byte of
data bus selected to be output on transparent data/status pins when ENDOUT bit is set.
10.2.5
Transparent Mode IO Specifications
Listed below are the specifcations for transparent mode input and output pins.
Table 10-5. Transparent Mode FB-DIMM Interface Signaling Specifications (Sheet 1 of 2)
Minimum
Maximum
500
Units
I/O voltage swing
0
2
mV
Input slew rate
V/ns
ps
Input to refclk (rising or falling edges) setup time
3000
1000
-1000
200
Input to refclk (rising or falling edges) hold time
ps
Status output valid to refclk time
+1000
300
ps
Vref
mV
mV
mV
mV
Vil (DC)
Vil (AC)
Vih (DC)
-300
-300
300
200
150
900
Intel® 6400/6402 Advanced Memory Buffer Datasheet
107
Transparent Mode
Table 10-5. Transparent Mode FB-DIMM Interface Signaling Specifications (Sheet 2 of 2)
Minimum
350
Maximum
900
Units
Vih (AC)
Voh
mV
mV
mV
mA
mA
400
Vol
100
Ioh
8
Iol
12
Note:
1. Ioh: current into a 50-ohm external load to ground, with on-die transmitter
termination enabled
2. Iol: current into a 50-ohm external load to 1.5 V supply rail, with on-die
transmitter termination enabled
10.2.6
IO Implementation Guidelines
10.2.6.1
Dedicated Receivers
Simple one-stage receivers for the transparent mode have been added in parallel to the
existing high-speed sampling receivers. The latter can be turned off during transparent
mode, as well as the DRC and the phase interpolator, to save power and avoid noise.
An internal VREF set to 0.25 V will be used, so the tester signals should oscillate
between 0 and 0.5 V. The transparent mode RX should be turned off during normal
mode, so as to save power/avoid noise.
10.2.6.2
Common Clock Scheme
To avoid costly implementations using strobes and FIFOs, a common clock scheme is
followed, implemented in the core, where the data capture flops reside. Since
transparent mode data signals from the tester are all in phase with the 100 MHz
system clock, the clock used for the capture flops has to be aligned with the external
system clock (or slightly delayed, to account for the propagation delay difference
between data receivers and clock receiver).
Aligning core clock and external clock can be done using the HVM mode circuitry
included in the PLL. The HVM clock tree will have to feed the capture flops, and one of
its leaves has to be fed back to the PLL, in order to achieve adequate synchronization.
10.2.6.3
Tester Interface Clock and Data Routing
The following uncertainties have to be factored in:
• Tester board (TIU) trace mismatches
• Package trace mismatches
• FBD low speed RX propagation delay variations due to PVT
• Set up and hold of capture flops (typically <350 ps depending on process, voltage
and temperature)
• Clock synchronization mismatch, core clock PLL and tree jitter (approximately
±200 pS)
At 200 MHz, there is a 5 ns data window. The potential FBD low speed receiver
variation is approximately 300 ps propagation variation over process, voltage and
temperature. Package and tester interface mismatches are not expected to exceed
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Transparent Mode
200 ps. Flop setup variation should also be less than 200 pS. After removing 400 ps for
clock uncertainties leaves 3.9 ns margin. While this is plenty of margin, some amount
of trace matching should be done on the tester interface to minimize skew.
10.2.6.4
Outgoing Control Signals
Only the TX+ pin should connect to the tester. The data on TX- can be discarded (it will
toggle at the same rate as TX+).
Terminating TX+ on the tester should be a given, as every tester offers this capability.
Terminating TX- could be done on the tester, by having a TIU (tester board) with a
route and a tester connection allocated for it. It may be cheaper to just have a 50 ohm
resistor tied to ground on the TIU itself, from the TX- pins.
To avoid the crossing clock domains from core clock to FBD fast clocks, the transparent
mode data flows directly through the Analog Front-end Unit of the TX.
10.2.6.5
Usage Models
Host Side Usage
10.2.6.5.1
TX: The transmitters are set the same as in normal operation (bias on, enable
termination, and so forth.).
RX: RX+ and RX- signals will be independent. Incoming data will free-flow through the
I/O (no flops). The routing distance from transparent_rxout pins should be the same
for all capture flops. All these flops should be clocked by the dedicated HVM clock.
10.2.6.5.2
Tester Side Usage
The tester interface should have trace-matched data signals, to avoid skews > 1 ns.
The tester should have 50 ohm terminations to ground for all TX pins in use (on-tester
termination can be used where applicable). The tester should enable 50 ohm
terminations to ground for all the signals sent to RX pins. This will guarantee
reasonable signal integrity.
10.3
Transparent Mode Control and Status Registers
In transparent mode, CSRs will be accessed and programmed through SMBus. See
Section 14.3.5, ‚ “Hardware Configuration Registers,” for register descriptions.
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Transparent Mode
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11 DDR MemBIST
11.1
MemBIST Overview
The Intel 6400/6402 Advanced Memory Buffer (AMB) supports memory built-in self
test (MemBIST) for memory initialization during system boot up and for testing the
installed memory. During DIMM manufacturing, MemBIST may be used to apply tests
at speed to test the AMB-to-DRAM interface. Table 11-1 below lists the features
provided by MemBIST.
At the system level, MemBIST may be executed on multiple DIMMs simultaneously.
This could be used to speed memory test during system boot.
During DIMM manufacturing, MemBIST offers a fast method to detect FBD assembly-
related defects, interface defects and the majority of memory-core-related defects.
This testing may be done through commands initiated across the FBD channel (in-band
test initiation) or through SMBus or JTAG commands (out-of-band test initiation),
making MemBIST compatible with motherboards, low cost ATE, or standalone
equipment such as continuity testers. To perform in-band testing on a motherboard,
the motherboard must contain an FBD-based memory subsystem.
MemBIST is primarily intended to test the AMB-to-DRAM interface and not the DRAM
core. It is expected that transparent mode will be used to test the core logic in DRAMs
already installed on DIMMs. For this reason, MemBIST includes primarily those
features needed for interface testing. MemBIST does not include all features needed
for DRAM core testing. Traditional system test methods are expected to be used for
operating system or application-based testing of the memory subsystem. This may
include existing memory stress tests, applications or other tests selected by the DIMM
manufacturer.
DDR interface testing requires stress of the AMB DDR I/O circuitry and the DDR I/O-to-
core path in the DRAM. The test needs to be able to detect static faults (such as stuck
signals) as well as dynamic faults (for example, slow timing paths) in the logic.
Testing this logic requires:
• Delivering patterns at full speed (667 MT/S).
• Incrementing and decrementing addresses. The address decoders are best tested
with marching or other non-linear patterns.
• Alternating data patterns (single rotating bits, checkerboards) to detect slow nodes
or capacitive coupling in the data path.
• Using standard interface timing (nominal clock cycle time, setup, hold, pre and
post-amble).
• Verifying ODT operation at speed
To accomplish the required testing, MemBIST has a number of modes of operation and
data formats which can be chosen to meet the specific need. In addition, MemBIST
supports a variety of DRAM timings and densities.
A fundamental feature of the MemBIST architecture is that, unlike transparent mode,
which simply replicates 8 bits of data across the DQ bus, MemBIST can control
individual bits in the 72 bit DQ bus. In addition, MemBIST can apply test patterns at a
rate as high as the DRAM address rate. To accomplish this, the MemBIST architecture
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DDR MemBIST
provides two 72 bit words, or 144 bits of test data for each DRAM clock cycle. The data
is supplied to the DRAMs on “early” and “late” phases of the DDR clock cycle. Early data
is provided on the rising edge of CK. Late data is provided one half cycle later on the
falling edge of CK. DRAM compare data is treated in a similar manner with appropriate
clock alignment.
11.2
MemBIST Feature Summary
Table 11-1 lists the features of MemBIST in summary form. Each feature is explained
in subsequent sections. The registers used to control these features are detailed in the
MemBIST register section.
Table 11-1. MemBIST Feature Summary (Sheet 1 of 2)
Feature
Feature Description
Memory Address Control
Address pattern in tests
User defined start and end physical address
Fast X, Fast Y, Fast XY, XZY address modes
Choice of incrementing or decrementing addresses
Dynamic address inversion (DAI) inverts alternate addresses
Up to 16
X (row) address bits
Y (column) address bits
Z (bank) address bits
Up to 13 (limited by MTR:numcol to A[13:11,9:0])
Up to 3
Data Patterns
Static data patterns
fixed nibble data patterns (0, 3, 5, 6, 9, A, C, F)
144-bit user-defined data pattern
288-bit user-defined data pattern
Dynamic data patterns
32-bit user-defined circular shifted data pattern
Random data pattern derived from user-specified 32-bit seed using
an LFSR (CRC32)
Data pattern inversion
Any data pattern can be inverted before being applied
Programmable DRAM Timing Control
DDR2 DRAM timing
Burst Length
Set in AMB registers
4 or 8
Refresh control
DDR2 refresh intervals programmable in AMB registers
BIST Engine Control
Fundamental commands
Write, read, read with data compare, write + read with data compare
all registers and settings accessible using FBD, JTAG, or SMBus
x4 or x8
Access method
DRAM data width
DRAM initialization and mode settings Set by AMB registers
Execution speed
Execution control
A programmable number of deselect commands may be inserted
after DRAM accesses to slow down the speed of execution
Halt on error or run to completion of test
Test abort during the test
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Table 11-1. MemBIST Feature Summary (Sheet 2 of 2)
Feature
Feature Description
Failure data access
Failure data logged and accessible using FBD, JTAG or SMBus
Logging may be delayed to capture later failures
Algorithms Provided
Algorithms operate over a specified address range with a fixed data pattern of 0xA only
Notation for algorithm definitions:
^ = increasing address from start to end
v = decreasing address from end to start
W / R = Write / Read and check
D / I = Data / Inverted Data
number = sequence of events
(x, y) = for each address, first x is applied, then y, before continuing to next address
Scan
^ (WD ); ^(RD ); ^ (WI ); ^ (RI )
1 2 3 4
Init
^ (WD )
1
Mats+
MarchC–
^(WD ); ^(RD , WI ); v(RI , WD );
1 2 3 4 5
^(WD ); ^(RD , WI ); ^(RI , WD );
1
2
3
4
5
v(RD , WI ); v(RI , WD ); v(RD );
6
7
8
9
10
Read and check
Error Logging
Error logging
^(RD );
1
Pass / fail indicator
Log up to 5 failing addresses
Record up to 4 sets of 144-bit failure data
144-bit failure data bit location accumulator marking bit failures
through entire test
11.3
MemBIST Operation
11.3.1
Fundamental Operations
The MemBIST logic provides a number of operational modes which can be combined in
various ways to provide a large number of useful combinations. For example, there is a
mode in which it is possible to select address incrementing first by column and then by
row, or the opposite of this. There is also a mode to dynamically invert every other
address, which toggles all address lines to opposite states. These two independent
modes can be combined to test a bank by toggling row address lines to opposite states
or by toggling column address lines to opposite states. Limits on combinations are
mentioned where they exist.
MemBIST also provides a number of complete operations which it can perform.
MemBIST operations can be characterized as a task which MemBIST carries out
automatically after being programmed for the task. The operation begins when
MBCSR:start is set by the user and ends when MemBIST clears this same bit.
MemBIST operations include built-in algorithms and fundamental commands.
MemBIST built-in algorithms consist of complete testing schemes which are
implemented in MemBIST and which carry out complete tests for meeting specific
testing objectives. They accomplish their testing completely under automatic control
once the operation is started.
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In addition, MemBIST has 4 fundamental commands which can be utilized directly by
the user. They are write, read, read with data compare, and write followed by read
with data compare. They are also used by the MemBIST built-in algorithms. Some
MemBIST algorithms also utilize additional fundamental commands that are not
available to users. As a result, users cannot duplicate all algorithm functionality by
sequentially running individual MemBIST commands.
11.3.2
Memory Addressing
A memory test is characterized by a starting address, an ending address and a
direction. The address generation logic has counters for row, column and bank
addresses. MemBIST does not change the rank bit during execution. Each rank on a
DIMM must be tested by a separate execution of MemBIST.
Addresses in MemBIST are logical addresses, meaning they follow the order of the
DRAM external address pins. The actual arrangement of bits in the array (the physical
address) will differ from the logical address. Therefore, an addressing scheme or data
pattern may not be applied to the array exactly as one might think. For example,
accesses to logically adjacent cells will not necessarily access physically adjacent cells.
For general purpose testing such as that intended for MemBIST this is not an issue. In-
depth array testing is best done on a portion of the array where the logical to physical
mapping is known, or in transparent mode where one has full control of address and
data sequencing.
11.3.2.1
Address Definition
All addresses in MemBIST have three components: a row address, a column address
and a bank address. The user communicates these values to MemBIST through 32-bit
registers. Column address 0 is not stored since the DRAMs are 72 bits wide and the
MemBIST engine has an internal 144 bit architecture. Column address 10 is used for
auto-precharge (always low in MemBIST) so it is also not specified in the address
registers.
User-defined start and end addresses are constrained to contain a column address
modulo the burst length. For instance, at BL=4, assume a memory access starts at
column 0. The next access would start at column 4, the next at column 8 and so on
(assuming Fast Y address sequencing). The address register bits reflect these
constraints. BL=4 allows specification of column bits 14..2, while BL=8 allows
specification of column bits 15..3.
Table 11-2. Memory Address Definition, BL=4
Address register bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
15 14 13 12 11 10 14 13 12 11
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
2
1
1
0
0
9
8
7
6
5
4
3
2
1
0
R
9
Row
Column
Bank
Note:
Address register bit 15 “R” = Reserved for future use
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Table 11-3. Memory Address Definition, BL=8
Address register bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
15 14 13 12 11 10 15 14 13 12 11
9
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
0
0
9
8
7
6
5
4
3
2
1
0
R
Row
Column
Bank
Note:
Address register bit 15 “R” = Reserved for future use
11.3.2.2
Address Generation
The address generation logic and controlling register bits allow a variety of methods to
traverse the address space of the DRAM. These are described in the next sections.
In these explanations, the symbol X refers to the row address. Row address lines are
also called word lines. The symbol Y refers to the column address. Column address
lines are also called bit lines. The symbol Z refers to the bank address. The MemBIST
start address consists of a triple of row, bank, and column address (Xstart, Zstart, Ystart
)
or (Xs, Zs, Ys) for brevity. Likewise, the end address consists of the triple (Xend, Zend
,
Yend) or (Xe, Ze, Ye). The row, bank or column symbols may also be used individually to
refer to a value without being included in the address triple to which it belongs.
11.3.2.2.1
Address Sequencing Options
MemBIST provides several options to select the address space for MemBIST operation
and for sequencing through the address space chosen. Table 11-4 below shows how the
MemBIST addresses are generated based on various parameters that affect address
generation. Detailed explanations of the entries are found in later sections.
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Table 11-4. MemBIST Addressing Behavior
Address Type (MBSCR:atype)
Address
Sequencing
(MBCSR:fast)
Range (specified in
MB_START_ADDR
Full (uses range of 0 to MTR
limit)
Single (specified in MBADDR)
a
and MB_END_ADDR )
b
Counter order XZY
Counter order XZY
X, Y, Z increment 0 to MTR limit
X, Y, Z decrement MTR limit to 0
Single burst to address specified
in MBADDR
MBCSR:fast ignored
3
c
d
X, Y increment start to end
3
X, Y decrement end to start
Z increments Z to Z if Z < Z
e
s
e
s
Z decrements Z to Z if Z < Z
e
e
s
s
Following is for Intel 6400/6402
Advanced Memory Buffer only
and not required by the FBD
DFx Spec
XZY
Z fixed at Z if Z = Z
e
s
s
Z increments Z to MTR limit,
s
wraps to 0, then to Z if Z >
e
s
Z . Z to Z is skipped.
e
e
s
•
Z decrements Z to 0,
e
wraps to MTR limit, then to
Zs if Z > Z . Z to Z is
s
e
e
s
skipped.
Counter order XY
Counter order XY
X, Y increment start to end
X, Y decrement end to start
X, Y increment 0 to MTR limit
X, Y decrement MTR limit to 0
Z fixed at 0
Fast Y
Fast X
Z fixed at Z Z is ignored.
s.
e
Counter order YX
X, Y increment start to end
X, Y decrement end to start
Counter order YX
X, Y increment 0 to MTR limit
X, Y decrement MTR limit to 0
Z fixed at 0
Z fixed at Z Z is ignored
s.
e
X and Y count simultaneously
X, Y increment start to end
X, Y decrement end to start
X and Y count simultaneously
X, Y increment 0 to MTR limit
X, Y decrement MTR limit to 0
Z fixed at 0
Fast XY
Z fixed at Z Z is ignored
s.
e
Notes:
a.
It is required that X < X , Y < Y and Z < Z X , Z , Y and X , Z , Y are the values in MB_START_ADDR and
s e s e s e. s s s e e e
MB_END_ADDR respectively
b.
c.
d.
Counter order is counter MSB to LSB in the order given.
Increment or decrement is selected using MBCSR:adir
MTR limit is the value shown in MTR for this address and refers to the top of this address range.
11.3.2.3
Address Space
The address space for MemBIST is selected using the MBCSR:atype field. The choices
include a single physical address specified in the MBADDR register, a range of
addresses as specified using the MB_START_ADDR and MB_END_ADDR registers, and
the full address space of the DRAMs as specified in the MTR register. The range and full
address spaces are depicted in the next figure, Figure 11-1.
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Figure 11-1. Range and Full Address Spaces
One Bank
Limit of address space as set by number of X and Y address lines
Address space as set by values in MTR register
Address space as set by start and end values in
MB_START_ADDR and MB_END_ADDR registers
E
S
Increasing X
0
0
Increasing Y
0001
As the figure above illustrates, when the values of the MB_START_ADDR (marked S)
and MB_END_ADDR (marked E) registers are used to set the address space for a
MemBIST operation, the values in these registers must bear the correct relationship to
each other. The start address sets the lower bound for the test address space in both
the X and Y directions, and the end address sets the upper bound in both the X and Y
directions. For a start and end address to define a usable address space, it is required
that Xs < Xe, and Ys < Ye. In addition, when an address sequencing mode is chosen in
which the bank field in MB_END_ADDR is significant, it is also required that Zs < Ze. (If
a single physical address is to be tested, MBADDR, not MB_START_ADDR and
MB_END_ADDR, is used.)
In every case in which an address endpoint is specified using a register value,
MemBIST includes the address endpoint in the operation. For example, if an address
range is specified using the MB_START_ADDR and MB_END_ADDR registers, the
locations specified in these registers are included as part of the address range. The
MemBIST operation will be performed on both of the locations specified in these
registers.
11.3.2.3.1 Order and Direction of Address Sequencing
The order of sequencing through the test address space is chosen using the
MBCSR:fast field. The options are Fast Y (with fixed bank), Fast X (with fixed bank),
Fast XY (with fixed bank) and XZY. The terms Fast X, Fast Y, Fast XY and XZY refer to
the order in which addresses are incremented or decremented during MemBIST
execution. This order is given in Table 11-4 above as “counter order.” Counter order of
XZY, for example, indicates that the Y counter is counted most rapidly. When counter Y
over or underflows due to reaching the programmed limit of its count, the overflow or
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DDR MemBIST
underflow is applied to the next, or Z, counter. When counter Z reaches its limit, its
overflow or underflow is applied to counter X. A counter that overflows or underflows
resets to its initial starting value and continues counting from that value.
When using XZY addressing, MemBIST accesses the banks specified by
MB_START_ADDR and MB_END_ADDR (with range addressing) or bank 0 through the
MTR limit (with full addressing).
When using XZY addressing, MemBIST accesses multiple banks.
• With range addressing (MBCSR:atype = 0x2), the banks accessed are in the
inclusive range specified by MB_START_ADDR:ba and MB_END_ADDR:ba.
• With full addressing (MBCSR:atype = 0x3), the bank address is bank 0 through the
MTR limit.
When using Fast X, Fast Y or Fast XY addressing, MemBIST will traverse a single bank.
• With range addressing (MBCSR:atype = 0x2), the bank is specified by
MB_START_ADDR:ba. MB_END_ADDR:ba is ignored.
• With full addressing (MBCSR:atype = 0x3), the bank address is always 0.
The direction of sequencing through the test address space is chosen using the
MBCSR:adir field. In this field, either incrementing addresses or decrementing
addresses may be selected. The beginning and ending addresses for the counters
depend upon the choice of addressing type programmed in MBCSR:atype. With range
addressing, the counter limits are specified in MB_START_ADDR and in
MB_END_ADDR. With full addressing, the counter limits are 0 and the MTR limit for
each counter. Special cases which exist for the bank address are specified in
Table 11-4.
11.3.2.4
Details and Examples
11.3.2.4.1
Fast Y
Figure 11-2 below depicts how Fast Y with incrementing addresses cycles through a
range of addresses specified by MB_START_ADDR and MB_END_ADDR. In this
execution mode, Z, or bank address, is held constant (except in the case of dynamic
address inversion mode, DAI, mentioned later). The order in which the locations are
accessed is shown in the boxes representing the memory locations. Note that the Y (or
column) address counter counts from Ys to Ye before incrementing the X (or row)
address counter and beginning again at Ys. This process continues until both the X and
Y address counters reach their end values simultaneously. This ending condition
results in the address range being covered once. The name “Fast Y” is descriptive of
this testing order in which the Y address range changes faster than the X address
range.
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Figure 11-2. Fast Y Address Sequencing
One Bank
Address space as set by values in MTR register
Address space as set by start and end values in
MB_START_ADDR and MB_END_ADDR registers
E
13
7
14
8
15
9
16
10
4
17
11
5
18
12
6
S
2
3
1
Increasing X
0
0
Increasing Y
0001
Fast Y address sequencing, increasing
address, specified address range
11.3.2.4.2
Fast X
Figure 11-3 below depicts how Fast X with decrementing addresses cycles through a
range of addresses specified by MB_START_ADDR and MB_END_ADDR. In this
execution mode, Z, or bank address, is held constant (except in the case of dynamic
address inversion mode, DAI, mentioned later). Note that the X address counter
counts down from Xe to Xs before decrementing the Y address counter and beginning
again at Xe. This process continues until both the X and Y address counters reach their
end Xs and Ys values simultaneously. This ending condition results in the address range
being covered once. The name “Fast X” is descriptive of this testing order in which the
X address range changes faster than the Y address range.
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DDR MemBIST
Figure 11-3. Fast X Address Sequencing
One Bank
Address space as set by values in MTR register
Address space as set by start and end values in
MB_START_ADDR and MB_END_ADDR registers
E
16
17
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
S
18
Increasing X
0
0
Increasing Y
0001
Fast X address sequencing, decreasing
address, specified address range
11.3.2.4.3
Fast XY
In Fast XY execution, both the X and Y address counters are changed by one count at
the same time. Each of these counters begins at its starting address and increments to
its ending address (or decrements from ending to starting address if so programmed)
and then reloads on the next count to its initial value. As a result, test execution
accesses the RAM locations in diagonal rows across the RAM. Execution stops when
both the X and Y address counters reach their end values simultaneously.
In the special case when there are the same number of rows and columns in the
address space, only the locations on the diagonal (whose relative row and column
positions are equal) will be tested. In the general case in which the specified address
range results in different numbers of rows and columns, not all locations may be
accessed. Which locations are accessed in this case depends upon the X to Y ratio of
the address space specified for the test. See Figure 11-4 below for several examples.
Because the starting and ending addresses are always located at opposite corners of
the address space, the end address is always eventually reached, and the MemBIST
operation always completes.
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Figure 11-4. Fast XY Address Sequencing Examples
Fast XY Examples
BL = 4, incrementing addresses
Y (Columns)
Y (Columns)
X
X
0
4
8
C
0
4
8
C
10
(Rows)
(Rows)
S
S
0
1
2
3
0
1
2
3
---
---
---
17
13
9
5
1
1
---
---
---
2
---
3
---
---
6
2
7
18
3
14
19
4
10
15
---
---
11
16
E
4
E
20
---
12
8
Y (Columns)
X
0
4
8
C
(Rows)
S
0
1
---
3
---
1
E
4
---
2
---
Numbers inside of cells indicate order of access.
--- inside a cell indicates that cell is not accessed.
0001
11.3.2.4.4
XZY Addressing
In XZY (range) address sequencing the MSB-to-LSB ordering of the address counters is
Row, Bank, Column, although this is not the order of the fields in the registers used for
address specification for MemBIST. As a result of this ordering of the counters, first the
columns in one row in the starting bank will be accessed, followed by those on the
same row in the second bank, and so on until that row in all banks has been accessed.
Then the columns in the next row in the first bank will be selected and the process
continued.
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11.3.2.4.5
Dynamic Address Inversion (DAI):
Dynamic address inversion (DAI) is provided to maximize the switching of address lines
during testing. When dynamic address inversion is enabled, the address counters
increment or decrement as usual, but every other address driven to the DRAMs is the
logical inverse of the previous address used. The least significant address bit is not
inverted since it already toggles at the address rate.
All address lines (X, Y and Z) are inverted by DAI, creating a ping-pong access pattern.
This occurs in all address sequencing modes. This behavior might lead to accesses in
unexpected portions of the address space. For example, DAI inverts the bank address
lines even in Fast X, Fast Y and Fast XY modes, which normally have fixed bank
addresses. As a result, every other access is to a different bank than the fixed bank
selected by the addressing mode (either MB_START_ADDR:ba field or bank 0 for range
or full addressing respectively). Between each access, the old bank must be closed and
the new bank must be activated. In another example, with XZY address sequencing
and range addressing, it is normal to think of accesses as being restricted to the
address range specified in MB_START_ADDR and MB_END_ADDR. But with DAI
enabled, the non-inverted accesses will be within the specified range, but the inverted
accesses could possibly fall outside of the specified address range.
DAI can be used with any address sequencing mode. It can also be used with either
incrementing or decrementing addresses. Table 11-5 gives an example of both address
incrementing and address decrementing in DAI mode. This example is of XZY address
sequencing with range addressing and shows only low-order bank and column address
lines. Shaded rows are non-inverted, non-shaded rows show inverted addresses.
Table 11-5. Dynamic Address Inversion, XZY Address Sequencing and Range Addressing
Normal
Column
DAI, incrementing address
Bank Column
DAI, decrementing address
Bank Column
Bank
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
01
01
Etc.
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
0
0
0
0
0
0
1
1
1
1
0
0
0
0
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
00
11
00
11
00
11
00
11
00
11
00
11
00
11
00
11
01
10
Etc.
0
1
0
1
0
1
0
1
1
0
1
0
1
0
1
0
0
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
00
11
00
11
00
11
00
11
00
11
00
11
00
11
00
11
11
00
Etc.
1
0
1
0
1
0
1
0
0
1
0
1
0
1
0
1
1
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
0
1
1
0
1
0
0
1
0
1
1
0
1
0
0
1
0
1
0
0
1
0
1
1
0
1
0
0
1
0
1
1
0
122
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR MemBIST
11.3.2.4.6
Address Inversion for Vtt Balancing
FB-DIMMs use a separate termination (Vtt) power supply for command/address
termination. Keep in mind the AMB has two copies of the CA bus. In normal operation
the AMB attempts to balance the number of high and low address lines by inverting one
of the address ports. Inverting one copy of the addresses reduces Vtt power
consumption. This operation is invisible to the controller and DRAM, as this is simply a
static inversion of address lines.
By default this behavior is enabled for all memory accesses including during MemBIST
operation. Most memory test patterns assume a particular address sequence. Vtt
balancing might not be desirable in these cases. The AMB provides a control bit
(DRC.BALDIS) to turn off Vtt balancing if desired. If the bit is set, no balancing will take
place. If adjacent address inversion is disabled Vtt power may increase substantially,
placing additional load on the system power supply.
11.3.3
Memory Data Formatting
During MemBIST operation, 144-bit data is used to write to memory and to check data
read from memory. The data register MBDATA allows definition of a 144-bit data
pattern. The 144-bit data will be written in two consecutive 72-bit locations within a
memory burst. When operating with a burst length of 4 (BL4), early data is written to
the first and third locations in the burst and late data to the second and fourth
locations. An 8-word burst (BL8) is treated in similar manner, with early data written to
odd-numbered locations and late data to even locations.
11.3.3.1
Static Data Formats
MemBIST provides a number of static data patterns which can be selected using bits in
MBCSR. A static data pattern is one in which the data remains the same throughout
the MemBIST operation. One such static data format is the fixed data pattern. The
fixed data patterns are concatenated together multiple times to make up the number of
bits required supply data to the DRAMs. In addition to these fixed patterns, the
MBDATA registers can be used to supply 144 bits of user-defined data. The data from
this static pattern is also concatenated together multiple times to make up the required
number of bits for MemBIST use.
Finally, there are certain cases, such as initializing ECC bits in system memory, that
require unique data in each data word. This requirement is met by using all 288 bits of
the data register MBDATA for user-defined data. This usage of the data register for
user-defined data occupies bits which normally are used for failure information.
Because the registers normally used for failure information are occupied with the data
pattern, when 288-bit user-defined data is used, no checking is performed.
11.3.3.2
Dynamic Data Formats
In addition to the static data formats, MemBIST has the ability to provide dynamically
changing data patterns. Dynamic data changes each time that a new address is
accessed. These supply shifted data and pseudo-random data.
Note:
The following description of circular shift and LFSR random data generation describes
the Intel 6400/6402 Advanced Memory Buffer implementation. This does not match the
FBD DFx description of these functions. Resolution of these differences will be decided
based on potential changes to Intel 6400/6402 Advanced Memory Buffer.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
123
DDR MemBIST
The simplified block diagram of Figure 11-5 below depicts the relationship between the
LFSR seed register MBLFSRSED, the MBDATA[9, 7:4] registers, and the data sent on
the CB and DQ chip pins when MemBIST executes a write command in the circular shift
or in the LFSR data modes. The LFSR seed register is the source of the data written to
the CD and DQ chip pins (and thus to the DRAMs) in both of these modes. When
MemBIST executes a read command, the data generation is the same, but the data is
not sent on the CB and DQ pins. Instead, it is used for comparison against the data
received from the DRAMs on the corresponding pins.
Figure 11-5. MemBIST Circular Shift and LFSR Data Block Diagram
MemBIST Circular Shift and LFSR Data Block Diagram
MBLFSRSED[31:0]
32
1
0
32
CRC-32
32
1
0
MBDATA9[31:0]
[30:0]
[31:0]
[15:8]
[7:0]
[31]
[31]
[31]
[31]
[31]
late_DQ_wr_data[71:64]
early_DQ_wr_data[71:64]
DDR Logic
cb[7:0]
load_lfsrseed
lfsr_mode
[0]
[0]
[0]
[0]
[31:1]
MBDATA7[31:0]
[30:0]
[31:0]
[31:0]
[31:0]
late_DQ_wr_data[63:32]
late_DQ_wr_data[31:0]
early_DQ_wr_data[63:32]
early_DQ_wr_data[31:0]
[31:1]
1
0
MBDATA6[31:0]
[30:0]
load_circseed
DDR Logic
dq[63:0]
[31:1]
MBDATA5[31:0]
[30:0]
[31:1]
MBDATA4[31:0]
[30:0]
[31:0]
MBCSR: invert
[0]
[31:1]
32
0002
In circular shift data mode, the 0 input of the mux at the far right is selected, since this
is not LFSR mode. At the beginning of MemBIST execution in this mode, the value of
the LFSR seed register is loaded into MBDATA9 by asserting the load_circseed signal
shown. Registers MBDATA[7:4] are all cleared to 0 at this time, so that their previous
contents are lost.
Each time that MemBIST execution requires data to be written to the DRAMs, 144 bits
are taken from the 160 bits comprising MBDATA[9,7:4], as shown in the figure. The
144 bits are either inverted or not before being sent to the DDR logic to be written to
the DRAMs, depending upon the state of the MBCSR:invert bit. After using the data,
the MBDATA[9,7:4] registers are clocked once, shifting the data around within these
registers to form new data to be used by MemBIST the next time that data is required.
For example, when MemBIST starts and MBCSR:invert is 0, the value from the LFSR
seed register will be loaded into MBDATA9, and MBDATA[7:4] will be cleared, so that
the first data available for MemBIST to write to the CB and DQ pins will consist of
MBDATA9[7:0] sent on the early cycle on the CB pins, MBDATA9[15:8] on the late cycle
on the CB pins, and 0s sent on all of the DQ pins on both the early and late cycles.
Once this data has been used, the MBDATA[9,7:4] registers are clocked. The data path
between the MBDATA registers is wired so that the data undergoes a left circular shift
when passing to the next register. Bits [30:0] become bits [31:1] in the receiving
register, and bit [31] becomes bit [0] in the receiving register. For example,
0x8000_0001 in MBDATA9 becomes 0x0000_0003 upon being loaded into MBDATA7.
124
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR MemBIST
In LFSR data mode, a similar procedure is followed, with the exception that the
lfsr_mode signal causes the mux on the far right of the figure to select the output of
the CRC-32 block to provide the input to register MBDATA9. At the beginning of
MemBIST execution, load_lfsrseed asserts once to use the value in the LFSR seed
register as the initial input to the CRC-32 block. On subsequent register loads, the
current value in MBDATA9 is used as the input to the CRC-32 block. Each time that
MBDATA9 is loaded with a new data value from the CRC-32 block, each of MBDATA[7:4]
also load new values from their inputs.
Before the first 144 bits of data are used by MemBIST in LFSR mode, 5 register loads
occur. This fills all bits in MBDATA[9,7:4] with random data values before the first data
is written to the DRAMs.
Table 11-6 below shows an excerpt from an example run of MemBIST executing with
MBCSR:dtype = 2, circular shift data. The table illustrates the relationship between the
LFSR seed register MBLFSRSED, the BMDATA[9, 7:4] registers, and the data sent on
the CB and DQ chip pins when executing in the circular shift mode with MBCSR:invert =
0. The table also illustrates how the circular shift occurs in the MBDATA registers. This
further illustrates the process explained and shown above.
Table 11-6. Example of Circular Data Shifting
Mbdata9
xxL[71:64
]E[71:64]
Mbdata7
L[63:32]
Mbdata6
L[31:0]
Mbdata5
E[63:32]
Mbdata4
E[31:0]
Early
CB
Late
CB
#
Early DQ
Late DQ
1
2
0000_0001
0
0
0
0
0
0
0
0
01
0
0
0
0
0
0
0000_0002
0000_0002
_0000_0000
3
4
5
6
0
0
0
0
0
0000_0004
0
0
0
0
0
0
0
0
0
0000_0000
_0000_0004
0
0
0
0
0000_0008
0
0000_0008
_0000_0000
0
0
0
0
0
0
0000_0010
0
0
0000_0000
_0000_0010
0000_0020
20
0
In the example shown, MBLFSRSED contains 0x0000_0001 when MemBIST execution
starts. MBCSR contains 0x8022_0a90. Line 1 shows the data from MBLFSRSED loaded
into MBDATA9, and shows how 144 bits of the data from MBDATA[9,7:4] are sent on
the CB and DQ pins when required by MemBIST. Line 2 shows the result of the circular
shift of MBDATA9 into MBDATA7, as explained previously. Line 2 also shows how this
second set of 144 bits of data will appear on the CB and DQ pins when it is used by
MemBIST. The table shows how the original data from MBLFSRSED is transferred from
register to register each time that data is required by MemBIST execution, with a one-
bit left circular shift occurring at each register transfer. Line 6 shows the data from
MBDATA4 arriving at MBDATA9, again with a circular shift left.
Table 11-7 below shows an excerpt from an example run of MemBIST executing with
MBCSR:dtype = 3, LFSR data. The table illustrates the relationship between the LFSR
seed register MBLFSRSED, the MBDATA[9, 7:4] registers, and the data sent on the CB
and DQ chip pins when executing in the LFSR data mode. The table also illustrates how
the circular shift occurs in the MBDATA registers during LFSR data mode with
MBCSR:invert = 0. This further illustrates the process shown in the figure above.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
125
DDR MemBIST
Table 11-7. Example of LFSR Random Data
Mbdata9
xxL[71:64
]E[71:64]
Mbdata7
L[63:32]
Mbdata6
L[31:0]
Mbdata5
E[63:32]
Mbdata4
E[31:0]
Early
CB
Late
CB
#
Early DQ
Late DQ
1
2
3
4
5
27fe_3b3d
0
0
0
0
0
0
0
0
0
0
4e2e_350c 4ffc_767a
C9a8_9bae 9c5c_6a18 9ff8_ecf4
97ca_9c36 9351_375d 38b8_d431 3ff1_d9e9
662f_8edd 2f95_386d 26a2_6ebb 7171_a862 7fe3_b3d2
4031_1dd0 cc5f_1dba 5f2a_70da 4d44_dd76 e2e3_50c4
dd
d0
8e
1d
7171_a862
_7fe3_b3d2
2f95_386d
_26a2_6ebb
6
4d44_dd76
cc5f_1dba
_ e2e3_50c4
_5f2a_70da
In the example shown, MBLFSRSED contains 0x93d7_8768 when MemBIST execution
starts. MBCSR contains 0x8011_0b90. Lines 1 through 5 show filling of
MBDATA[9,7:4] with random data generated by the CRC-32 block. For each line, newly
generated random data is loaded into MBDATA9, and MBDATA[7:4] are loaded with
data which is the result of a circular left shift from the register above it. Line 5 shows
how 144 bits of the data from MBDATA[9,7:4] is sent on the CB and DQ pins when
required by MemBIST. Line 6 shows the result of the circular shift of the contents of
each MBDATA register into the next MBDATA register. Line 6 also shows how this
second set of 144 bits of data will appear on the CB and DQ pins when it is used by
MemBIST. The table shows how the random data from MBDATA9 is transferred from
register to register each time that data is required by MemBIST execution, with a one-
bit left circular shift occurring at each register transfer.
11.3.4
Algorithmic Testing
MemBIST provides several of the more common algorithmic tests. Several of these are
directed at basic operation such as initializing memory or verifying proper connectivity
of the AMB and DRAM on a DIMM. In addition there are a few tests that are intended to
perform testing of the AMB address generators and DRAM internal address decoders,
multiplexers and related logic that is not otherwise testable at speed.
The algorithm engine takes control of the MemBIST engine to carry out the algorithm
steps. It does this by writing to some of the control bits in MBCSR. As a result, those
control bits used by the algorithm engine are not available for setting by the user.
However, the remaining control bits may be utilized by the user to control the
algorithm. The MemBIST controls which may be selected by the user when using one
of the built-in algorithms are:
• Address sequencing (Fast X, Fast Y, Fast XY, and XZY)
• Rank selection
• Halt or continue on error
When an algorithm is used, the data used for the test is always the fixed pattern 0xA.
No other pattern may be chosen. The address space for the algorithm is always the
address range specified by MB_START_ADDR and MB_END_ADDR. If testing of the full
address range of the DRAM is required, then the MB_START_ADDR and MB_END_ADDR
registers must be set to this address range.
126
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR MemBIST
When using the built-in algorithms, the initial command for the algorithm must be
entered into MBCSR:cmd. For all algorithms except data retention read, the initial
command to enter is write (0x1). For the data retention read algorithm, the initial
command to enter is read and check (0x3).
Because the algorithm engine takes control of the MemBIST engine to carry out the
algorithm steps, a guess about the algorithm step during which the first failure
occurred can be formulated by examining the various MemBIST control registers after
MemBIST halts on error. After the operation halts, the control register values will
generally still reflect their settings when the algorithm step detected the failure.
The algorithms provided by MemBIST are specified in the following sections. The
algorithms are specified using the following notation:
^ = increasing addressing. Addresses will be counted up, starting at 0 or the user-
defined start address as appropriate.
v = decreasing addressing. Addresses will be counted down, starting at the end of the
array or from the user-defined end address, as appropriate.
w or r = Write or Read with checking of the data against the expected data.
D or I = Data or Inverted Data
number = sequence of events
( ) = back to back operations. Example: (wD, rD) will read and then write the same cell
before moving to the next cell.
11.3.4.1
Initialization Tests
Init: ^ (wD)1
This is a simple memory initialization algorithm. Data is written
to the array with incrementing addressing.
Read and check: ^(rD)1This test is used to verify memory contents. One use of this is
data retention testing. Init may be used to write known data in
the array. The tester or system can then alter an environmental
condition, or simply wait for some period of time, and then read
the array to see if the data changed.
Scan: ^(wD)1; ^(rD)2; ^ (wI)3; ^ (rI)4
The scan test writes data to the array then reads the data back.
The second half of the test writes inverted data and reads it
back. Scan is a 4N pattern, meaning test time will be 4
traversals, times the size of the array (rows * columns * banks,
also known as ‘N’) times the average time for a read or write
operation.
11.3.4.2
Memory Stress Tests
Mats+: ^(wD)1; ^(rD2, wI3); v(rI4, wD5)
The Mats+ algorithm initializes the array to a known data
background and steps through with a read-write-inverted-data
sequence. The algorithm is performed with both incrementing
and decrementing addressing. Mats+ will detect stuck at faults
and basic address decoder faults. The algorithm is order 5N.
MarchC-: ^(wD)1; ^(rD2, wI3); ^(rI4, wD5); v(rD6, wI7); v(rI8, wD9); v(rD)10
The MarchC- algorithm initializes the array to a known data
background and steps through the array in both count-up and
count-down addressing with a read-write sequence. MarchC-
tests the array decoders and basic neighboring faults. As might
Intel® 6400/6402 Advanced Memory Buffer Datasheet
127
DDR MemBIST
be determined from the sequence numbering this is a 10N
pattern.
11.3.5
Error Reporting and Control
Information about failures detected by MemBIST is reported in a variety of ways.
These are summarized here and detailed in the following sections. MBCSR:pf set
during a MemBIST operation indicates that a failure was detected. MBDATA can log the
addresses of up to 5 failures. When the MemBIST operation is utilizing a fixed data
pattern selected using MBCSR:dtype = 0x0, MBDATA also contains a failure data bit
location accumulator, which logs any data bit that has seen a failure during the
operation. With other dtypes, the failure data bit location accumulator may replace the
address logs. MB_ERR_DATA logs the first four 144-bit data words which MemBIST
detects as containing an error after the Memory Test Failure Address Pointer Register
(MBFADDRPTR) has counted down to zero. MBFADDRPTR makes it possible to extract
the failure data information for all repeatable failures which occur during execution of a
MemBIST operation.
How the available logs in are filled depends partly upon the MemBIST configuration and
partly upon how the errors detected by MemBIST occur. For example, when MemBIST
is set to halt on error and a failure is detected, MemBIST does not advance to the next
address. However, due to the architecture of the memory system, there may be more
than one error to log from the single address that was being checked when the failure
was detected. At burst length of 4, for each address there are four 72-bit bus-widths of
data to be checked. Data is logged in 144-bit quantities. If a bit in the DRAM bus was
stuck, this might result in an error being detected in each of the four 72-bit bus-widths
of data. Even though MemBIST is set to halt on error, this would result in two 144-bit
data error logs, each with a corresponding failure address log. Operating at BL=8 could
result in up to four 144-bit data error logs being written with their corresponding
address logs.
When MemBIST is not set to halt on error, logs will fill as errors occur. The logs may
contain information from several unrelated failing addresses. The first four failures to
be detected will cause the first four 144-bit failure data chunks to be logged along with
their corresponding addresses. The address of the fifth error to occur will also be
logged, although there is no location available to log the failure data. The sixth and
succeeding errors will not be logged. During execution of a MemBIST operation,
MemBIST will not overwrite a log entry that has already been filled during that
operation to record a more recent failure.
11.3.5.1
Control Register Pass/Fail Bit and Halt On Error
The MemBIST pass/fail bit, MBCSR:pf, is always cleared when MemBIST execution
starts. If a failure is ever detected, this bit is always set immediately. If MBCSR:halt
(halt on detection of read-compare error) is set, and MBCSR:pf is then set due to
detection of an error, MemBIST execution always completes the accesses to the current
address and then halts without proceeding to the next address. No other MemBIST
controls, including a non-zero value in MBFADDRPTR, modifies the setting of the failure
bit or the halting on failure detection as described.
11.3.5.2
Failure Address Logging
The addresses of the first 5 detected failures can be logged by MemBIST. The address
logs (located in MBDATA) are always cleared, and the logging pointer is always reset to
start logging with the first log, each time that MemBIST starts execution of a new
operation.
128
Intel® 6400/6402 Advanced Memory Buffer Datasheet
DDR MemBIST
Failure addresses are logged in a slightly different format than the format which is used
when specifying start and end addresses. To compress the failure address into 32 bits,
bits that are always zero are not stored in the log. These unstored bits include
AutoPrecharge Column address [10] and the least significant bits assumed by burst
length. In BL=4 operation, column bit 1 in the log is replaced by a bit which
distinguishes whether the error was detected in the first 144-bit data chunk (the bit is
0) or in the second chunk (the bit is 1). In like manner, for BL=8 operation, column
bits 2:1 are replaced by two bits to identify the data chunk containing the error. The
bits used for BL=8 are shaded in Table 11-8 below. See Section 14.5.2.3.1, “MBDATA
Failure Address Mapping” for more information.
Table 11-8. Address Log to Bank, Row and Column Bit Correspondence
Address Log Register Bit
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
9
8
9
7
8
6
7
5
6
4
5
3
4
2
3
1
2
0
1
2
1
0
15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
14 13 12 11
Bank
Row
Column
11.3.5.3
Failure Data Bit Location Accumulator
MemBIST provides a (sometimes optional) 144-bit failure data bit location accumulator,
maintained in the MBDATA registers. Each bit tracks a data bit during MemBIST
operation. This accumulator is automatically zeroed each time that MemBIST starts
execution of a new operation.
An accumulator bit set to 1 indicates that the corresponding data bit failed to have the
expected value at least once during the operation. This accumulator is used primarily
for recording detected failed data lines to facilitate DRAM replacement during DIMM
manufacturing.
Table 11-9 below shows the correspondence between the DRAM data bus bits and the
160 bits in the MBDATA registers used to store the failure data bit location accumulator.
Table 11-9. Failure Data Bit Location Accumulator to MBDATA Bit Correspondence
MBDATA[8]
MBDATA[3]
MBDATA[2]
MBDATA[1]
MBDATA[0]
31
24
23
16
15
71
8
7
0
31
63
0
31
31
0
31
63
0
31
31
0
Unused
64
71
64
32
0
32
0
Late data
Early data
Late data
Late data
Early data
Early data
11.3.5.4
Failure Data Logging
Failure data is logged in the MB_ERR_DATA registers. These data logging registers are
not cleared when MemBIST starts execution of a new operation, although the
corresponding address logs in the MBDATA registers are cleared. The user desiring to
discard failure data logs from a previous operation must write zeros to these registers
before starting the next operation. During execution of a subsequent operation, when
the first failure is detected, both an address and a data log are written, beginning with
the first error log entry. Any existing data in the data logging registers used for this log
entry is overwritten. The data in the other data logging registers is not affected.
Table 11-10 shows the correspondence between the failure number, the address log for
this error, and the data log for this error. Which register is used to log the address of
the failure depends upon settings in MBCSR:dtype and MBCSR:algo. If MBCSR:algo is
non-zero, then an algorithm is selected, and fixed data is used. Address logging will
occur according to the “Fixed data pattern” entries in Table 11-10.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
129
DDR MemBIST
If MBCSR:algo = 0x0 (no algorithm), then MBCSR:dtype determines the failure address
error logging registers. For dtype = 0x0 (fixed), address logging will occur according
the to “Fixed data pattern” entries in Table 11-10. For dtype other than 0x0 (that is,
circular, random, or user data), if MBCSR:mbdata = 1, then the “Other data pattern”
entries show the address logging registers. For these dtypes, if MBCSR:mbdata = 0
(accumulator), no failure address logging is available.
Table 11-10.Failure to Logging Register Correspondence
Failure
number
Address logged in
Data logged in
1
Fixed data pattern: MBDATA4
Other data pattern: MBDATA0
MB_ERR_DATA0[4:0]
2
3
Fixed data pattern: MBDATA5
Other data pattern: MBDATA1
MB_ERR_DATA1[4:0]
MB_ERR_DATA2[4:0]
MB_ERR_DATA3[4:0]
Not logged
Fixed data pattern: MBDATA6
Other data pattern: MBDATA2
4
Fixed data pattern: MBDATA7
Other data pattern: MBDATA3
5
Fixed data pattern: MBDATA9
Other data pattern: MBDATA8
6 +
Not logged
Not logged
11.3.5.5
Multiple Failures
MemBIST may detect many more failures than there are available registers in which to
log them. For some test purposes, the information captured by the failure data bit
location accumulator may be sufficient. However, in other situations, capturing all of
the failure data and failure addresses may be significant. As long as the failures are
repeatable, MemBIST provides a mechanism to extract the failure information about all
failures which MemBIST detects during execution of each MemBIST operation.
Repeatable failures are ones which occur each time that a test is run.
MemBIST uses the MBFADDRPTR register to discard logs for certain errors, allowing
other errors to be logged instead. (However, this register has no effect on setting bits
in the failure data bit location accumulator.) The error logging described in the
previous section actually occurs on the first through fifth errors after the
MBFADDRPTR register equals zero. Since this register defaults to zero, this is the
normal logging behavior. However, if storing of logs for later errors is desired, the
MBFADDRPTR register should simply be set to the number of earlier logs which are to
be discarded.
For example, suppose that MemBIST has been executed, and 5 logs were stored in the
failure address logs. Full information was available for the first four (because both
address and data logs exist). To collect both the failure address and data for the fifth
failure, set MBFADDRPTR to 0x4 and rerun MemBIST. Each of the first 4 logs will be
discarded, and will decrement MBFADDRPTR until it reaches 0. The fifth log will be
stored, as it is the first to occur after MBFADDRPTR reached 0.
This will work no matter what the position of the error is within the burst. Referencing
the above example, if the fourth error is within a burst, and the fifth error is within the
same burst but not in the same 144-bit chunk containing the fourth error, the fourth
error will not be logged and the fifth error will be logged.
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To use this feature, MemBIST must be set to continue on error by clearing MBCSR:halt.
Otherwise MemBIST will halt on detecting the first failure and later failures will not be
detected or logged. Neither setting of the failure bit, nor halting on failure detection is
affected by a non-zero value in MBFADDRPTR.
The general procedure for using this feature is to run MemBIST, read and record the
address and data failure information from the logs, and then add the number of failure
logs received to the value in MBFADDRPTR to cause the failure information already
captured to be ignored on the next pass. This process is repeated until MemBIST
completes with zeros in the address logs. This indicates that no further errors were
detected beyond those already logged. (Watch the case of decrementing addressing
ending at address 0. A failure at address 0 with failure data of zero is possible.)
To generate a complete data log of all failures, use the following procedure:
1. Define starting and ending addresses, address modes and data patterns, set
MBFADDRPTR to zero, set halt on error to 0 (don’t halt on error).
2. Start MemBIST and check the result. If pass, exit. If fail, continue.
3. Read out the failing addresses and data. If the address and data logs are zero (and
the address space covered by this pass of MemBIST does not include address 0),
exit, as all failures have been seen. Otherwise, continue. (If the address space
covered by this pass of MemBIST does include address 0, and it is ambiguous
whether or not address 0 has failed, the ambiguity can be resolved by retesting
only address 0.)
4. Add the number of complete logs (for which both address and data were read)
obtained during this pass to the value in MBFADDRPTR so that these failures will
not be seen again on the next pass of MemBIST.
5. Go to step 2
11.3.6
11.3.7
DRAM Throttling
MemBIST can generate high DRAM bandwidth and consequently, high power
consumption and thermal stress. Although this is manageable in a dedicated test
environment, a system’s power and cooling capacity may be exceeded. For this reason
MemBIST allows insertion of deselect cycles on every address change. The deselects
will be inserted after each read or write command. This allows slowing down BIST
execution if necessary to stay within a given power or cooling envelope.
Refresh Control
In normal operation, refresh commands are issued by the host rather than by the AMB.
However, during MemBIST, when commands to the DRAM originate from the AMB,
refresh must be provided by MemBIST. The refresh and MemBIST state machines are
implemented as separate state machines, allowing refresh when MemBIST is not
active. The refresh interval is programmable by setting a 15 bit refresh counter. For
example, at the maximum address frequency of 400 Mhz (250 pS), 3120 clocks are
needed to achieve the nominal refresh interval of 7.8 µS. The maximum interval in this
case will be 81.9 µS. The default refresh value should be usable in most circumstances.
The refresh interval may be programmed to other values to meet special needs.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
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DDR MemBIST
Table 11-11.Refresh Programming
spec (uS)
clk period (uS)
count
tREFI (15 bits)
min
spec
max
0
0.0025
1
7.8
0.0025
0.0025
3120
32768
81.9
11.3.8
DRAM Initialization
As in other operating modes, MemBIST requires the DRAM be initialized prior to the
start of any operation. DRAM initialization is accomplished by starting the initialization
engine (using the DCALCSR register). This may be done in band or out of band.
11.4
MemBIST Memory Test Examples
In general, using MemBIST will involve the following five steps:
1. Define DRAM characteristics. Set up AMB registers for normal DRAM operation.
This includes programming the MTR register to match the geometry of the DRAMs
on the DIMM. In addition, program the DRT register to match the DDR2 timing of
the DRAMs installed on the DIMM. MemBIST uses settings from MTR and DRT to
match its operation to the characteristics of the DRAMs being tested. Change the
default refresh interval if it does not meet the test objectives. Perform any other
normal initialization.
2. Define the test address space. Define the starting and ending physical Row/
Column/Bank address range which MemBIST is to test in registers MBADDR,
MB_START_ADDR, and MB_END_ADDR as required. Which of these registers is
used depends upon which address range is selected in MBCSR:atype and whether
or not an algorithm is selected.
3. Enter required user test data. Define any required user test data for this test,
using registers MBDATA[9:0] and MBLFSRSED as appropriate. Which of these
registers is used depends upon the setting of MBCSR:dtype, MBCSR:algo, and
MBCSR:enable288.
4. Set test parameters and start MemBIST. Write MBCSR with MBCSR:start set
and other bits set as required to select the desired MemBIST operation.
5. Evaluate the result. The test result is available through MBCSR:pf. Depending
upon which settings were specified in MBCSR, error information is contained in the
MBDATA[9:0]and MB_ERRDATA[4:0] registers.
The next sections provide specific examples of MemBIST execution for selected test
cases.
11.4.1
Write a Fixed Pattern to a Range of DRAM Addresses
The following points describe the programming required to write a fixed data pattern to
all of the addresses within a selected address range, and to optionally check this data,
using MemBIST.
1. Set up registers for normal DRAM operation.
2. Program MB_START_ADDR and MB_END_ADDR registers to the desired address
range to be tested.
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3. No user data is required, as fixed data (selected in MBCSR) will be used for this
test. Therefore, the MBDATA[9:0] and MBLFSRSED registers are not written.
4. Program MBCSR.
These fields are required for the specified test:
— Program DTYPE (bits [9:8]) to 00 to select fixed data pattern.
— Program ATYPE (bits [7:6]) to 10 to use the address range already defined in
the MB_START_ADDR and MB_END_ADDR registers.
— Select either Rank 0 or Rank 1 by programming CS (bits [21:20]).
— MBDATA (bit 14) and ENABLE288 (bit 15) are not relevant when fixed data has
been selected. INVERT (bit 19) is unnecessary for fixed data, since the data
choices include inverses for all fixed data patterns. Rewrite these fields with
their default values.
The values for these fields can be selected to choose options for use during
MemBIST operation:
— Program ABAR (bit 13) to select DAI if desired.
— Either program CMD (bits [5:4]) to be “01” (write only without data
comparison) or “11” (write followed by read with data comparison).
— Program FAST (bits [11:10]) to select Fast X, Fast Y, Fast XY, or XZY
(column->bank->row) address sequencing.
— Program ADIR (bit 12) to select whether addresses should increment or
decrement.
— Program FIXED (bits [18:16]) to specify which fixed data pattern to apply.
Set these control values to start the MemBIST engine.
— Set ALGO (bits 26:24) to 0 to prevent the algorithm engine from overwriting
bits it controls in MBCSR.
— Set ABORT (bit 28) to 0.
— Clear PF (bit 30). Hardware will set this bit if a failure is detected.
— If desired to halt whenever there is an error, set HALT (bit 29).
— Set START (bit 31) to 1 to start MemBIST execution.
5. Check the MemBIST results, and if checking was enabled, observe failure data or
address through MBDATA registers and MB_ERR_DATA registers:
— Check MBCSR:start. 0 means MemBIST has completed. Check MBCSR:PF. 1
means a failure has occurred.
— Failure data bit location accumulator will be stored in MBDATA[8, 3:0].
— Up to 5 failure addresses will be placed in MBDATA[9, 7:4]
— Failure data will be stored in MB_ERR_DATA[3:0][4:0] registers.
11.4.2
Write Random Data to a Range of DRAM Addresses and
Check
This describes writing randomly generated data to a range of DRAM addresses and
checking this data.
1. Set up registers for normal DRAM operation.
2. Program MB_START_ADDR and MB_END_ADDR registers to the desired address
range to be tested.
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DDR MemBIST
3. Random data is created by the LFSR using the seed value in MBLFSRSED. Either a
value can be written, or the default value can be used. MBDATA[9:0] is unused and
is therefore not written.
4. Program MBCSR.
These fields are required for the specified test:
— Program DTYPE (bits [9:8]) to 11 to select LFSR-generated random data.
— Program CMD (bits [5:4]) to be 11 (write followed by read with data
comparison).
— Program ATYPE (bits [7:6]) to 10 to use the address range already defined in
the MB_START_ADDR and MB_END_ADDR registers.
— Select either Rank 0 or Rank 1 by programming CS (bits [21:20]).
— ENABLE288 (bit 15) is not relevant when random LFSR data has been selected.
INVERT (bit 19) is unnecessary for random data. Rewrite these fields with their
default values.
The values for these fields can be selected to choose options for use during
MemBIST operation:
— Program ABAR (bit 13) to select DAI if desired.
— Program FAST (bits [11:10]) to select Fast X, Fast Y, Fast XY, or XZY (column-
>bank->row) address sequencing.
— Program ADIR (bit 12) to select whether addresses should increment or
decrement.
— MBDATA (bit 14) is set to select failure address logging or failure data bit
location accumulator logging in MBDATA.
Set these control values to start the MemBIST engine.
— Set ALGO (bits 26:24) to 0 to prevent the algorithm engine from overwriting
bits it controls in MBCSR.
— Set ABORT (bit 28) to 0.
— Clear PF (bit 30). Hardware will set this bit if a failure is detected.
— If desired to halt whenever there is an error, set HALT (bit 29).
— Set START (bit 31) to 1 to start MemBIST execution.
5. Check the MemBIST results, and if a failure occurred, observe failure data or
address through MBDATA registers and MB_ERR_DATA registers:
— Check MBCSR:start. 0 means MemBIST has completed. Check MBCSR:PF. 1
means a failure has occurred.
— Depending upon the value chosen for MBCSR:mbdata, either up to 5 failure
addresses or the failure data bit location accumulator will be stored in
MBDATA[8, 3:0].
— Failure data will be stored in MB_ERR_DATA[3:0][4:0] registers.
11.4.3
Write Leaping 0s to the Full DRAM Address Range and
Check
This describes writing leaping 0s to all locations in the DRAM on the DIMM and checking
this data. Leaping 0s are like walking 0s except that rather than moving from bit to
adjacent bit, the single 0 in a field of 1s moves from one bit to another bit far removed
from it. Of every 160 writes to the DRAMs, 144 will have a 0 on some bit, and 16 will
have no 0s on any bit. Refer to the tables and block diagram above to see how this
works.
1. Set up registers for normal DRAM operation.
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2. This example illustrates the use of MBCSR:atype = 11, so MB_START_ADDR and
MB_END_ADDR are not programmed. However, these registers could alternatively
be set to 0 and the maximum address in the DIMM respectively, and MBCRS:atype
set to 10, to accomplish the same effect.
3. To get a field of 1s for the leaping 0 to traverse, data to the DRAMs must be
inverted. This is because MBDATA[9, 7:4] are set to zeros at the start of MemBIST
execution. That also means that the data programmed into MBLFSRSED must be
inverted. So MBLFSRSED is set to 0x0000_0001. When inverted, this will give a
single 0 in a field of 1s. Registers MBDATA[8, 3:0] are unused and are therefore
not written.
4. Program MBCSR.
These fields are required for the specified test:
— Program DTYPE (bits [9:8]) to 10 to select circular shifted data.
— Program CMD (bits [5:4]) to be 11 (write followed by read with data
comparison).
— Program ATYPE (bits [7:6]) to 11 to use the full address range of the DIMMs as
already defined in the MTR register.
— Select either Rank 0 or Rank 1 by programming CS (bits [21:20]).
— INVERT (bit 19) must be set to 1 to create the field of 1s from the 0s in
MBDATA[9, 7:4].
— ENABLE288 (bit 15) is not relevant when circular shifted data has been
selected. Rewrite this field with its default value of 0.
The values for these fields can be selected to choose options for use during
MemBIST operation:
— Program ABAR (bit 13) to select DAI if desired.
— Program FAST (bits [11:10]) to select Fast X, Fast Y, Fast XY, or XZY (column-
>bank->row) address sequencing.
— Program ADIR (bit 12) to select whether addresses should increment or
decrement.
— MBDATA (bit 14) is set to select failure address logging or failure data bit
location accumulator logging in MBDATA.
Set these control values to start the MemBIST engine.
— Set ALGO (bits 26:24) to 0 to prevent the algorithm engine from overwriting
bits it controls in MBCSR.
— Set ABORT (bit 28) to 0.
— Clear PF (bit 30). Hardware will set this bit if a failure is detected.
— If desired to halt whenever there is an error, set HALT (bit 29).
— Set START (bit 31) to 1 to start MemBIST execution.
5. Check the MemBIST results, and if a failure occurred, observe failure data or
address through MBDATA registers and MB_ERR_DATA registers:
— Check MBCSR:start. 0 means MemBIST has completed. Check MBCSR:PF. 1
means a failure has occurred.
— Depending upon the value chosen for MBCSR:mbdata, either up to 5 failure
addresses or the failure data bit location accumulator will be stored in
MBDATA[8, 3:0].
— Failure data will be stored in the MB_ERR_DATA[3:0][4:0] registers.
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DDR MemBIST
11.4.4
Write 144-bit User-defined Pattern to a Range of
Addresses and Check
This describes writing user-defined data to a range of DRAM addresses and checking
this data.
1. Set up registers for normal DRAM operation.
2. Program MB_START_ADDR and MB_END_ADDR registers to the desired address
range to be tested.
3. 144 bits of user-defined data is written to MBDATA[9, 7:4]. MBDATA[8, 3:0] and
MBLFSRSED are unused and are therefore not written.
4. Program MBCSR.
These fields are required for the specified test:
— Program DTYPE (bits [9:8]) to 01 to select user-defined data.
— ENABLE288 (bit 15) is left 0 to select 144 bit user-defined data.
— Program CMD (bits [5:4]) to be 11 (write followed by read with data
comparison).
— Program ATYPE (bits [7:6]) to 10 to use the address range already defined in
the MB_START_ADDR and MB_END_ADDR registers.
— Select either Rank 0 or Rank 1 by programming CS (bits [21:20]).
— INVERT (bit 19) is unnecessary for user-defined data, as the user can set the
bits to the values desired directly. Set this field to 0.
The values for these fields can be selected to choose options for use during
MemBIST operation:
— Program ABAR (bit 13) to select DAI if desired.
— Program FAST (bits [11:10]) to select Fast X, Fast Y, Fast XY, or XZY (column-
>bank->row) address sequencing.
— Program ADIR (bit 12) to select whether addresses should increment or
decrement.
— MBDATA (bit 14) is set to select failure address logging or failure data bit
location accumulator logging in MBDATA[8, 3:0].
Set these control values to start the MemBIST engine.
— Set ALGO (bits 26:24) to 0 to prevent the algorithm engine from overwriting
bits it controls in MBCSR.
— Set ABORT (bit 28) to 0.
— Clear PF (bit 30). Hardware will set this bit if a failure is detected.
— If desired to halt whenever there is an error, set HALT (bit 29).
— Set START (bit 31) to 1 to start MemBIST execution.
5. Check the MemBIST results, and if a failure occurred, observe failure data or
address through MBDATA registers and MB_ERR_DATA registers:
— Check MBCSR:start. 0 means MemBIST has completed. Check MBCSR:PF. 1
means a failure has occurred.
— Depending upon the value chosen for MBCSR:mbdata, either up to 5 failure
addresses or the failure data bit location accumulator will be stored in
MBDATA[8, 3:0].
— Failure data will be stored in MB_ERR_DATA[3:0][4:0] registers.
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DDR MemBIST
11.4.5
Test a Range of DRAM Addresses With March C- Algorithm
The following points describe the programming required to test all of the addresses
within a selected address range using the March C- algorithm provided by MemBIST.
1. Set up registers for normal DRAM operation.
2. Program MB_START_ADDR and MB_END_ADDR registers to the desired address
range to be tested. If the full address of the DIMM is to be tested, it must be
programmed here.
3. No user data is required, as all built-in testing algorithms use the fixed data pattern
0xA (regardless of the pattern selected by MBCSR:fixed). Therefore, the
MBDATA[9:0] and MBLFSRSED registers are not written.
4. Program MBCSR.
These fields are required for the specified test:
— Set ALGO (bits 26:24) to 110 to select the built-in March C- testing algorithm.
— Program CMD (bits [5:4]) to be 01 (write only without data comparison), as
this is required for the March C- algorithm.
The values for these fields can be selected to choose options for use during
MemBIST operation:
— Select either Rank 0 or Rank 1 by programming CS (bits [21:20]).
— Program FAST (bits [11:10]) to select Fast X, Fast Y, Fast XY, or XZY
(column->bank->row) address sequencing.
These bits are taken over by the algorithm engine to execute the algorithm. Set
them to their default values.
— FIXED (bits [18:16]).
— ADIR (bit 12).
— ABAR (bit 13).
— DTYPE (bits [9:8]).
— ATYPE (bits [7:6]).
— ENABLE288 (bit 15)
— INVERT (bit 19).
— MBDATA (bit 14). This bit is irrelevant because algorithms always use fixed
data, so both failure data bit lane accumulator and failure addresses are logged
in MBDATA.
Set these control values to start the MemBIST engine.
— Set ABORT (bit 28) to 0.
— Clear PF (bit 30). Hardware will set this bit if a failure is detected.
— If desired to halt whenever there is an error, set HALT (bit 29).
— Set START (bit 31) to 1 to start MemBIST execution.
5. Check the MemBIST results, and if checking was enabled, observe failure data or
address through MBDATA registers and MB_ERR_DATA registers:
— Check MBCSR:start. 0 means MemBIST has completed. Check MBCSR:PF. 1
means a failure has occurred.
— Failure data bit location accumulator will be stored in MBDATA[8, 3:0]. Up to 5
failure addresses will be placed in MBDATA[9, 7:4]. Use the “Fixed Data
Pattern” mapping for these registers.
— Failure data will be stored in MB_ERR_DATA[3:0][4:0] registers.
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DDR MemBIST
11.5
MemBIST Implementation
11.5.1
MemBIST Block Diagram
Figure 11-6. MemBIST Block Diagram
GB MemBist Internal block diagram
mb_raddr/mb_caddr/mb_baddr/mb_cs
mcre2mcmb_cntl_req
mbist_cmd_l[2:0]
mbaddr[31:0]
mtr
mcsr2mcmb_rst_req
mbcsr[31:0]
mbcsr[31:0]
drt/drc
start_addr/end_addr
Command
raddr/caddr/baddr
raddr/caddr/baddr
Control
readcmd
Address
Generator
cs
mbcavail
mbstart
writecmd
tstinit
CS
FSM
readcmd
writecmd
Cycle
Tracker
read_idle
write_idle
dataput
dcget
MemBist
Flow
Control
Dataput
Generator
* Refresh logic is implemented outside
of MCMB block.
rdstart/wrstart
tstcompare
Embedded
Algorithm
Data
Tracker
tstdone
wrpattern
data_reset
mbdata[319:0]
mbcsr[31:0]
late_write_data[71:0]
early_write_data[71:0]
early_read_data[71:0]
late_read_data[71:0]
Rev 3.0 05/22/04
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DDR MemBIST
11.5.2
MB Flow Control State Machine
Figure 11-7. MBFSM Diagram
core_rst_l =0
MemBist MBFSM
IDLE
mbstart &
(wronly |
wrrdcmp)
RD_DONE
Always
rdidle & ~rd2wr
or
lfsrdata
WR_START
wridle & rd2wr
cget &
lastaddr &
rd2wr
WR_SEED
RD_WAIT
RD_WRAVL
~ lfsrdata
cget & lastaddr & ~rdw2wr
Always
lfsrseed_done
WR_NXTAD
wronly
RD_AVAIL
cget & rd2wr
RD_NXTWR
cget & ~lastaddr
Always
cget &
~lastaddr &
rd2wr
Always
cget &
~lastaddr &
~rd2wr
WR_AVAIL
cget & lastaddr
WR_WAIT
RD_NXTAD
lfsrseed_done
~ lfsrdata
RD_SEED
writeidle
lfsrdata
WR_DONE
~wronly
RD_START
This FSM controls the MemBIST flow and generates read/write commands for
MemBIST.
• When MBCSR bit[31] is programmed to begin execution, the MemBIST FSM will
transition out of the IDLE state to either WR_START or RD_START, depending upon
the MemBIST command programmed in MBCSR:cmd.
• In WR_START state, FSM will look at the decoding of DATA type selection. If LFSR
data type generation is selected, FSM will go to WR_SEED state. If not, FSM will
directly go to WR_NXTAD state.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
139
DDR MemBIST
• In WR_SEED state, MemBIST will create 5 crc32 data sets and load into MBDATA4/
5/6/7/9 from the initial seed register MBLFSRSED. When 5 sets of random data are
loaded into MBDATA, the FSM will transition out of this state to WR_NXTAD state.
• In the WR_NXTAD state, the next address for the operation is calculated and the
address issued. The FSM then transitions to the WR_AVAIL state immediately.
• The FSM will alternate between WR_NXTAD and WR_AVAIL until all writes are
issued. In the WR_AVAIL state, a write command will be issued. Once the previous
cycle’s DRAM timing requirements are met (indicated by cget true), the FSM leaves
the WR_AVAIL state. If the write command issued was not to the last address, the
FSM will transition to WR_NXTAD. If this was the last address, the FSM will go to
WR_WAIT state.
• In the WR_WAIT state, the FSM will wait for the timing for the last write to be met,
and then will transition to the WR_DONE state.
• If this is a write only operation, then the FSM will go back to the IDLE state. If this
is a write with read comparison test, the FSM will go to the RD_START state.
• In RD_START state, FSM will look at the decoding of DATA type selection. If LFSR
data type generation is selected, FSM will go to RD_SEED state. If not, FSM will
directly go to RD_NXTAD state.
• In RD_SEED state, MemBIST will create 5 crc32 data sets and load into MBDATA4/
5/6/7/9 from the initial seed register MBLFSRSED. When 5 sets of random data is
set and loaded into MBDATA, FSM will transit out of this state to RD_NXTAD state.
• In the RD_NXTAD state, the next address for the operation is calculated and the
address issued. The FSM transitions to the RD_AVAIL state immediately.
• The FSM will alternate between RD_NXTAD and RD_AVAIL until all reads are issued.
In the RD_AVAIL state, a read command will be issued. Once the previous cycle’s
DRAM timing requirements are met (indicated by cget true), the FSM leaves the
RD_AVAIL state. If the read command issued was not to the last address, the FSM
will transition to RD_NXTAD. If this was the last address, the FSM will go to
RD_WAIT state. If this is a back to back read/write operation, the FSM will transit
from the RD_AVAIL state to the RD_NXTWR state.
• In the RD_NXTWR state, the address for the write command will be issued (which
is the same as the read address previously used). The FSM then transitions to the
RD_WRAVL state immediately.
• From the RD_WRAVL state, if this is the last address, the FSM will go to the
RD_WAIT state after meeting the DRAM timing requirements. If this is not the last
address, the FSM will go back to the RD_NXTAD state again after meeting the
DRAM timing requirements.
• In the RD_WAIT state, the FSM will wait for the timing requirements for the last
read or write to be met, and then transition to the RD_DONE state.
• From the RD_DONE state the FSM will always go to the IDLE state.
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11.5.3
CS Finite State Machine
Figure 11-8. CS State Machine
MemBist CSFSM
Self-Refresh
core_rst_l =0
Sref_request
IDLE
ACT
Aref_request
Auto-
Refresh
Activating
Go_idle
RCD_met
samepage &
timing_met
RDWT
~samepage &
timing_met
Precharge
Intel® 6400/6402 Advanced Memory Buffer Datasheet
141
DDR MemBIST
11.5.3.1
MemBIST CSFSM
This FSM creates DRAM commands for MemBIST.
• When read or write command is available and tRP/tRC timing are met, MemBIST
CSFSM will transit out of IDLE state to ACT state.
• In ACT state, FSM will wait for tRCD timing parameter qualified and go to RDWT
state.
• If the next coming read or write command is in same page and DRAM timing is
qualified, FSM will be looping in this state. If the next command is not in the same
page or there is an auto-refresh/self-refresh request, FSM will go to PRECHARGE
state.
• In PRECHARGE state, FSM always go back to IDLE state.
• In IDLE state, if there is a self refresh or an auto refresh request, FSM will wait for
self refresh logic accept signal or auto refresh accept signal.
§
142
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
12 Ballout and Package
Information
12.1
Ballout
The following section presents preliminary ballout information for the Intel 6400/6402
Advanced Memory Buffer (AMB). This ballout is subject to change and is to be used for
informational purposes only.
12.2
655-Ball FBGA 0.8mm Pitch Pin Configuration
Figure 12-1. Pinout Configuration
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29
A
B
C
D
E
F
G
H
J
K
L
M
N
P
R
T
U
V
W
Y
AA
AB
AC
Intel® 6400/6402 Advanced Memory Buffer Datasheet
143
Ballout and Package Information
12.3
Pin Assignments for the Advanced Memory Buffer
(AMB)
Table 12-1. 655-Ball FBGA 0.8 mm Pitch - Left Side
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
V
V
V
V
TESTLO
V
V
DD
A
B
DQ26
DQ12
DQS10 DQ13
DQS1 DQ10
SS
DD
DD
DD
DD
DD
TESTLO
V
V
V
V
V
V
SS
DQS3 DQS3
DQ14 DQS10
DQ11 DQS1
DDRC
DDRC
DD
SS
SS
SS
DDRC
DQS8
V
V
V
V
V
C
DQS2 DQ18
DQ4
DQS9
DQ15
DQ7
DQ9
DQ8
DQS17
SS
SS
SS
SS
SS
V
V
V
V
V
D
E
DQ19 DQS2
DQ16
DQ29
DQ24
DQS9
DQ6
DQ3
DQ1
DQS0
DQS8
CB1
SS
SS
SS
SS
DD
V
V
V
V
V
DQ21
DQ17
DQ23
DQ25
DQ27
DQ5
DQ0
DQ2
CB2
CB3
SS
SS
SS
SS
SS
TESTLO TEST
V
V
V
V
V
F
DQ20
DQ31
NC
DQS0
NC
CB0
RFU
SS
SS
SS
SS
DD
BFUNC
V
G
DQS11 DQS11
NC
NC
DQS12 DQS12
NC
NC
RFU
RFU
SS
V
V
V
V
V
V
H
J
DQ22
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
DQ28
BA1A
DQ30
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
SS
SS
SS
DD
SS
DD
V
V
V
V
V
V
CLK2
CLK0
CKE1A
RASA
SS
SS
DD
SS
DD
SS
V
V
V
V
V
K
L
CLK2
CLK0
WEA
SS
SS
CC
SS
CC
V
V
V
V
V
V
A0A
CKE0A
SS
SS
CC
SS
CC
SS
V
V
V
V
V
M
ODT0A RFU
CASA
BA2A
A10A
SS
SS
CC
SS
CC
V
CC
V
V
V
V
N
P
CS1A
A6A
CS0A
NC
NC
NC
NC
NC
NC
BA0A
A1A
NC
NC
NC
NC
NC
NC
SS
SS
CC
SS
V
CC
V
V
V
V
V
A2A
A3A
SS
SS
SS
CC
V
V
V
V
V
V
R
T
A8A
A13A
PN0
PN1
PN2
PN3
PN4
NC
NC
NC
NC
NC
NC
NC
A11A
A5A
A7A
NC
NC
NC
NC
NC
NC
NC
NC
NC
SS
SS
CC
SS
CC
SS
V
V
V
V
A4A
PN0
PN1
PN2
PN3
A9A
SS
SS
CC
SS
CC
V
V
V
U
NC
NC
A15A
A14A
A12A
RFU
CCFBD
SS
SS
a
a
V
V
V
V
V
V
V
V
V
V
SN0
SN1
SN2
SN0
SN1
SN2
RFU
RFU
SS
CCFBD
SN3
SS
CCFBD
SS
CCFBD
SN7
SS
SS
SS
V
W
Y
SN4
SN4
SN5
SN5
SN13
SN13
SN12
SN12
SN6
SN6
SN8
SN8
SN9
SN9
SN10
SN10
SS
V
SN3
SN7
SS
V
V
V
V
V
V
V
V
V
V
V
V
V
AA
AB
PN4
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
a
V
V
V
CCAPLL
RESET
PN5
PN5
PN13
PN13
PN12
PN12
PN6
PN6
PN7
PN7
PN8
PN8
PN9
PN10
PN10
PN11
PN11
RFU
SS
SSAPLL
PLLTST
O
a
V
AC
PN9 FBDRES
RFU
SS
These pin positions are reserved for forward clocks to be used in future AMB implementations.
144
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
Table 12-2. 655-Ball FBGA 0.8 mm Pitch - Right Side
16
17
18
19
20
21
22
23
24
25
26
27
28
29
V
V
V
V
V
DD
A
B
C
D
E
TEST
TEST
DQ52
DQS15
DQS15
DQ49
DQS6
DQS6
DQ48
DQ38
DD
DD
DD
DD
DD
V
V
V
V
V
SS
DDRC
DDRC
DQ53
DQ55
DQ50
DQS7
DQS13 DQS13
SS
SS
SS
V
V
V
V
V
DD
DQS17
CB6
DQ54
DQ51
DQ59
DQ56
DQ36
DQ46 DQS14
SS
SS
SS
SS
V
V
V
V
SS
CB7
CB5
DQS16
DQ63
DQ61
DQS7
DQ58
DQ44
DQ33
DQS14 DQ47
SS
SS
SS
V
V
V
V
V
SS
DQS16
DQ62
DQ57
TEST
DQ39
DQ37
DQ45
DQS5
DQ41
SS
SS
SS
SS
TEST
V
V
V
V
V
F
CB4
DQ60
NC
DQ35
NC
DQ43
DQS5
DD
SS
SS
SS
SS
TEST
LO
V
G
RFU
RFU
NC
NC
DQS4
DQS4
DQ34
NC
NC
DQ40
DQ42
SS
V
V
V
V
V
H
J
NC
NC
NC
NC
NC
NC
NC
NC
NC
DQ32
RFU
NC
NC
NC
NC
NC
NC
NC
NC
NC
SS
DD
SS
SS
SS
V
V
V
V
V
RASB
CLK3
CLK1
DD
SS
DD
SS
SS
V
V
V
V
K
ODT0B CS1B
CLK3
CLK1
SS
CC
SS
SS
V
V
V
CC
SS
V
V
V
L
NC
NC
NC
CASB
WEB
NC
NC
NC
CC
SS
SS
V
V
V
V
V
M
N
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
NC
CS0B
A0B
BA1B
NC
NC
NC
NC
NC
NC
CKE0B
BA0B
SS
CC
SS
SS
SS
V
V
V
A2B
A4B
BA2B
CC
SS
CC
CC
SS
V
V
V
V
V
P
A1B
NC
NC
NC
CKE1B
SS
SS
CC
SS
SS
V
V
V
V
V
V
R
A6B
A11B
A8B
A10B
NC
NC
NC
A3B
A7B
PS8
PS7
PS6
PS5
PS9
CC
SS
SS
SS
V
V
V
T
A9B
NC
NC
NC
A5B
PS8
PS7
PS6
PS5
SS
CC
SS
SS
V
V
CCFBD
U
RFU
A15B
A14B
A13B
SS6
SA0
A12 B
SS7
SS7
SCL
SA2
SS8
SS8
SDA
SA1
SS
a
a
V
V
V
V
V
V
V
RFU
RFU
CCFBD
SS
CCFBD
SS
CCFBD
SS
V
V
W
Y
SS0
SS0
SS1
SS2
SS2
SS3
SS3
SS4
SS4
SS9
SS9
SS5
SS5
SS
SS
V
V
SS1
SS6
SS
SS
V
V
V
V
V
V
V
V
V
V
V
V
AA
PS9
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
SS
TESTLO
_AB20
a
V
V
V
V
AB
SN11
SN11
SCK
SCK
PS0
PS0
PS1
PS1
PS2
PS2
PS3
PS3
PS4
PS4
RFU
SS
SS
DDSPD
SS
TEST
LO_AC2
0
a
V
V
AC
RFU
RFU
SS
SS
These pin positions are reserved for forward clocks to be used in future AMB implementations.
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 1 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
A3
A4
A5
A6
A7
A8
A9
VSS
B15
B16
B17
B18
B19
B20
B21
VSS
C25
C26
C27
C28
C29
D1
DQ56
VSS
DQ26
DQ12
VDD
VDD
TESTLO
DQ46
DQS14
VDD
DDRC_B18
VSS
DQS10
DQ13
VDD
DQS15
DQ53
DQ19
DQS2
D2
Intel® 6400/6402 Advanced Memory Buffer Datasheet
145
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 2 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
A10
A11
A12
A13
A14
A15
A16
A17
A18
A19
A20
A21
A22
A23
A24
A25
A26
A27
B2
DDQS1
DQ10
VDD
B22
B23
B24
B25
B26
B27
B28
C1
VSS
D3
VSS
DQS6
DQ50
VSS
D4
DQ16
DQ24
VSS
D5
TESTLO
VDD
D6
DQS13
DQS13
VSS
D7
DQS9
DQ7
VDD
D8
VDD
D9
VSS
TEST
VDD
VSS
D10
D11
D12
D13
D14
D15
D16
D17
D18
D19
D20
D21
D22
D23
D24
D25
D26
D27
D28
D29
E1
DQ3
C2
DQS2
DQ18
VSS
DQS0
VSS
DQ52
DQS15
VDD
C3
C4
DQS8
DQS8
VDD
CB6
C5
DQ4
DQ49
DQS6
VDD
C6
DQS9
VSS
C7
C8
DQ15
DQ9
CB7
DQ48
DQ38
VDD
C9
VSS
C10
C11
C12
C13
C14
C15
C16
C17
C18
C19
C20
C21
C22
C23
C24
F14
F15
F16
F17
F18
F19
F20
F21
F22
F23
F24
VSS
DQS16
DQ63
VSS
DQ8
VDD
DDRC_C12
VSS
B3
DQS3
DQS3
VSS
DQ59
DQS7
VSS
B4
DDRC_C14
DQS17
DQS17
VSS
B5
B6
DQ14
DQS10
VSS
DQ36
DQ44
VSS
B7
B8
DDRC_C18
DQ54
VSS
B9
DQ11
DQS1
VSS
DQS14
DQ47
DQ21
VSS
B10
B11
B12
B13
B14
E5
DQ55
DQ51
VSS
DDRC_B12
TESTLO
VDD
E2
E3
DQ17
DQ29
DQS4
VSS
DQS7
CB0
E4
VSS
G23
G24
G25
G26
G27
G28
G29
H1
E6
DQ25
DQ6
CB3
E7
CB4
NC
E8
VSS
VDD
NC
E9
DQ5
DQ62
DQ60
VSS
NC
E10
E11
E12
E13
E14
E15
DQ1
DQS5
DQ40
DQ22
VSS
VSS
DQ0
TEST
CB1
TEST
H2
VSS
VSS
H3
NC
CB2
DQ37
H4
NC
146
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 3 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
E16
E17
E18
E19
E20
E21
E22
E23
E24
E25
E26
E27
E28
E29
F1
VSS
F25
F26
F27
F28
F29
G1
DQ35
VSS
DQS5
DQ43
VSS
DQS11
DQS11
NC
H5
NC
CB5
H6
DQ28
DQ30
VSS
NC
DQS16
VSS
H7
H8
DQ61
DQ57
VSS
H9
H10
H11
H12
H13
H14
H15
H16
H17
H18
H19
H20
H21
H22
H23
H24
H25
H26
H27
H28
H29
J1
NC
G2
NC
DQ58
DQ39
VSS
G3
VSS
VDD
VSS
VDD
VSS
VDD
VSS
NC
G4
NC
G5
NC
DQ33
DQ45
VSS
G6
VSS
DQS12
DQS12
NC
G7
G8
DQ41
VSS
G9
G10
G11
G12
G13
G14
G15
G16
G17
G18
G19
G20
G21
G22
K12
K13
K14
K15
K16
K17
K18
K19
K20
K21
K22
K23
K24
K25
K26
NC
F2
DQ20
DQ23
VSS
NC
NC
F3
BFUNC
RFU
RFU
RFU
TESTLO
RFU
RFU
NC
NC
F4
VSS
DQ34
DQ32
NC
F5
DQ31
DQ27
VSS
F6
F7
F8
TESTLO
TEST
VSS
NC
F9
NC
F10
F11
F12
F13
J3
VSS
DQ42
VSS
CLK2
NC
DQS0 -> DQS0
DQ2
VDD
NC
NC
NC
DQS4
VSS
VCC
VSS
VCC
VSS
VCC
VSS
NC
J2
L21
L22
L23
L24
L25
L26
L27
L28
L29
M1
J4
NC
VSS
CASB
WEB
NC
J5
NC
J6
BA1A
VSS
J7
J8
CKE1A
NC
NC
J9
NC
J10
J11
J12
J13
J14
J15
J16
J17
NC
VSS
CLK1
ODT0A
RFU
NC
NC
NC
VDD
VSS
NC
ODT0B
CS1B
VSS
NC
M2
VDD
VSS
M3
M4
NC
VDD
VSS
M5
NC
NC
M6
CASA
Intel® 6400/6402 Advanced Memory Buffer Datasheet
147
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 4 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
J18
J19
J20
J21
J22
J23
J24
J25
J26
J27
J28
J29
K1
VDD
NC
K27
K28
K29
L1
NC
M7
VSS
BA2A
NC
CLK1
CLK3
CLK0
VSS
NC
M8
NC
M9
NC
M10
M11
M12
M13
M14
M15
M16
M17
M18
M19
M20
M21
M22
M23
M24
M25
M26
M27
M28
M29
R19
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
T1
NC
RASB
VSS
RFU
NC
L2
NC
L3
VSS
VCC
VSS
VCC
VSS
VCC
VSS
NC
L4
NC
L5
NC
NC
L6
A0A
CKE0A
VSS
NC
NC
L7
CLK3
VSS
CLK2
CLK0
NC
L8
L9
L10
L11
L12
L13
L14
L15
L16
L17
L18
L19
L20
P10
P11
P12
P13
P14
P15
P16
P17
P18
P19
P20
P21
P22
P23
P24
P25
P26
P27
P28
NC
K2
NC
NC
K3
VCC
VSS
VCC
VSS
VCC
VSS
VCC
NC
NC
K4
NC
CS0B
VSS
BA1B
NC
K5
NC
K6
VSS
WEA
RASA
NC
K7
K8
NC
K9
NC
K10
K11
N1
NC
CKE0B
VSS
NC
NC
NC
CS1A
CS0A
NC
NC
N2
NC
NC
N3
VSS
VCC
VSS
VCC
VSS
VCC
VSS
NC
NC
N4
NC
A6B
VSS
A10B
NC
N5
NC
N6
VSS
BA0A
A10A
NC
N7
N8
NC
N9
NC
N10
N11
N12
N13
N14
N15
N16
N17
N18
N19
NC
A3B
VSS
A4A
A13A
NC
NC
NC
VCC
VSS
VCC
VSS
VCC
VSS
VCC
NC
NC
VSS
A4B
A1B
NC
T2
T3
T4
NC
T5
NC
NC
T6
VSS
A9A
A7A
NC
T7
VSS
T8
148
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 5 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
N20
N21
N22
N23
N24
N25
N26
N27
N28
N29
P1
NC
P29
R1
CKE1B
VSS
A8A
NC
T9
NC
NC
T10
T11
T12
T13
T14
T15
T16
T17
T18
T19
T20
T21
T22
T23
T24
T25
T26
T27
W17
W18
W19
W20
W21
W22
W23
W24
W25
W26
W27
W28
W29
Y1
NC
A0B
A2B
VSS
NC
R2
NC
R3
VSS
VCC
VSS
VCC
VSS
VCC
VSS
NC
R4
NC
R5
NC
NC
R6
A11A
VSS
A5A
NC
NC
R7
BA0B
BA2B
A6A
VSS
NC
R8
R9
R10
R11
R12
R13
R14
R15
R16
R17
R18
V8
NC
P2
NC
NC
P3
VCC
VSS
VCC
VSS
VCC
VSS
VCC
VCCFBD
VSS
NC
P4
NC
A11B
A9B
VSS
NC
P5
NC
P6
A2A
A1A
A3A
NC
P7
P8
NC
P9
NC
T28
T29
U1
A7B
A5B
PN0
PN0
NC
SS0
V9
SS1 -> SS1
SS2
a
V10
V11
V12
V13
V14
V15
V16
V17
V18
V19
V20
V21
V22
V23
V24
V25
V26
V27
V28
V29
W1
RFU
a
U2
RFU
SS3
U3
VCCFBD
VSS
SS4
U4
NC
SS9
U5
NC
VSS
SS5
U6
A15A
A14A
A12A
NC
VSS
SS6
U7
VCCFBD
VSS
SS7
U8
SS8
U9
VCCFBD
VSS
VSS
U10
U11
U12
U13
U14
U15
U16
U17
U18
U19
U20
U21
NC
PS6
NC
VCCFBD
PS6
a
RFU
VCCFBD
VSS
VSS
VSS
VCCFBD
RFU
NC
RFU
PN3
a
RFU
Y2
PN3
VSS
A13B
A12B
SA2
SA1
PS7
Y3
VSS
Y4
SN2
SN2
SN3
SN4
SN5
SN13
SN12
Y5
Y6
Y7
Y8
NC
PS7
Y9
NC
PN2
Y10
Intel® 6400/6402 Advanced Memory Buffer Datasheet
149
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 6 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
U22
U23
U24
U25
U26
U27
U28
U29
V1
A8B
W2
PN2
VSS
SN1
SN1
SN3
SN4
SN5
SN13
SN12
SN6
SN7
SN8
SN9
SN10
VSS
Y11
Y12
Y13
Y14
Y15
Y16
Y17
Y18
Y19
Y20
Y21
Y22
Y23
Y24
Y25
SN6
SN7
SN8
SN9
SN10
VSS
SS0
SS1
SS2
SS3
SS4
SS9
SS5
SS6
SS7
A15B
A14B
SA0
W3
W4
W5
SCL
W6
SDA
PS8
W7
W8
PS8
W9
PN1
W10
W11
W12
W13
W14
W15
W16
V2
PN1
V3
VSS
SN0
SN0
VCCFBD
VSS
V4
V5
V6
V7
These pin positions are reserved for forward clocks to be used in future AMB implementations.
Y26
SS8
VSS
PS5
PS5
VSS
PN4
PN4
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
VSS
AB7
PN12
PN6
AC19
AC20
AC21
AC22
AC23
AC24
AC25
AC26
AC27
SCK
Y27
AB8
TESTLO_AC20
Y28
AB9
PN7
PS0
PS1
PS2
PS3
PS4
Y29
AB10
AB11
AB12
AB13
AB14
AB15
AB16
AB17
AB18
AB19
AB20
AB21
AB22
AB23
AB24
AB25
AB26
AB27
AB28
AC3
PN8
AA1
PN9
AA2
VSSAPLL
VCCAPLL
PN10
PN11
VSS
AA3
a
AA4
RFU
AA5
VSS
AA6
AA7
SN11
VSS
AA8
AA9
SCK
AA10
AA11
AA12
AA13
AA14
AA15
AA16
AA17
AA18
AA19
AA20
AA21
AA22
TESTLO_AB20
PS0
PS1
PS2
PS3
PS4
a
RFU
VDDSPD
VSS
VSS
AC4
PN5
AC5
PN13
a
AC6
RFU
150
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
Table 12-3. Advanced Memory Buffer Signals By Ball Number (Sheet 7 of 7)
Ball No.
Signal
Ball No.
Signal
Ball No.
Signal
AA23
AA24
AA25
AA26
AA27
AA28
AA29
AB2
VSS
VSS
VSS
VSS
PS9
AC7
PN12
PN6
AC8
AC9
PN7
AC10
AC11
AC12
AC13
AC14
AC15
AC16
AC17
AC18
PN8
PN9
PS9
FBDRES
PLLTSTO
PN10
PN11
RFU
VSS
VSS
RESET
PN5
PN13
AB3
AB4
AB5
SN11
VSS
a
AB6
RFU
These pin positions are reserved for forward clocks to be used in future AMB implementations.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
151
Ballout and Package Information
12.4
Package Information
Figure 12-2. Bottom View
152
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Ballout and Package Information
Figure 12-3. Top View
T
Intel® 6400/6402 Advanced Memory Buffer Datasheet
153
Ballout and Package Information
Figure 12-4. Package Stackup
T
§
154
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Signal Lists
13 Signal Lists
13.1
Conventions
The terms assertion and de-assertion are used extensively when describing signals, to
avoid confusion when working with a mix of active-high and active-low signals. The
term assert, or assertion, indicates that the signal is active, independent of whether the
active level is represented by a high or low voltage. The term de-assert, or de-
assertion, indicates that the signal is inactive.
Signal names may or may not have a “#” at appended to them. The “#” symbol at the
end of a signal name indicates that the active, or asserted state occurs when the signal
is at a low voltage level. When “#” is not present after the signal name the signal is
asserted when at the high voltage level.
Differential pairs use the “#” to indicate the “negative” signal in the pair. The “positive”
signal in When discussing data values used inside the component, the logical value is
used; that is, a data value described as “1101b” would appear as “1101b” on an active-
high bus, and as “0010b” on an active-low bus. When discussing the assertion of a
value on the actual signal, the physical value is used; that is, asserting an active-low
signal produces a “0” value on the signal.
Typical frequencies of operation for the fastest operating modes are indicated. Test
guardbands are not included. No frequency is mentioned for asynchronous or analog
signals.
Some signals or groups of signals have multiple versions. These signal groups may
represent distinct but similar ports or interfaces, or may represent identical copies of
the signal used to reduce loading effects. Table 13-1 shows the conventions used in this
document.
Curly-bracketed non-trailing numerical indices, for example, “{X/Y}”, represent
replications of major buses. Square-bracketed numerical indices, , “[n:m]” represent
functionally similar but logically distinct bus signals; each signal provides an
independent control, and may or may not be asserted at the same time as the other
signals in the grouping. In contrast, trailing curly-bracketed numerical indices, for
example, “{x/y}” typically represent identical duplicates of a signal; such duplicates
are provided for electrical reasons.
Table 13-1. Signal Naming Conventions
Convention
Expands to
RR{0/1/2}XX
RR[2:0]
Expands to: RR0XX, RR1XX, and RR2XX. This denotes
similar signals on replicated buses.
Expands to: RR[2], RR[1], and RR[0]. This denotes a
bus.
RR{0/1/2}
Expands to: RR2, RR1, and RR0. This denotes electrical
duplicates.
RR# or RR[2:0]# Denotes an active low signal or bus.
Table 13-2 lists the reference terminology used for signal types.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
155
Signal Lists
Table 13-2. Buffer Signal Types
Buffer
Direction
Description
I
Input signal
O
Output signal
Analog
A
I/O
Bidirectional (input/output) signal
13.2
Intel 6400/6402 Advanced Memory Buffer (AMB)
Pin Description List
Table 13-3 describes the Intel 6400/6402 Advanced Memory Buffer (AMB)
packagepins.
Table 13-3. Pin Description (Sheet 1 of 2)
Signal
Type
Description
Channel Interface
PN[13:0]
O
Northbound Output Data: High speed serial signal. Read path from AMB toward host on
primary side of the DIMM connector.
PN[13:0]
SN[13:0]
O
I
Northbound Output Data Complement
Northbound Input Data: High speed serial signal. Read path from the previous AMB toward
this AMB on secondary side of the DIMM connector.
SN[13:0]
PS[9:0]
I
I
Northbound Input Data Complement
Southbound Input Data: High speed serial signal. Write path from host toward AMB on
primary side of the DIMM connector.
PS[9:0]
SS[9:0]
I
Southbound Input Data Complement
O
Southbound Output Data: High speed serial signal. Write path from this AMB toward next
AMB on secondary side of the DIMM connector. These output buffers are disabled for the last
AMB on the channel.
SS[9:0]
FBDRES
O
A
Southbound Output Data Complement
External precision resistor connected to VCC. On-die termination calibrated against this
resistor.
DRAM Interface
CB[7:0]
I/O
I/O
I/O
I/O
O
Check bits
DQ[63:0]
Data
DQS[17:0]
DQS[17:0]
Data Strobe: DDR2 data and check-bit strobe.
Data Strobe Complement: DDR2 data and check-bit strobe complements.
Address: Used for providing multiplexed row and column address to SDRAM.
A0A-A15A,
A0B-A15B
BA0A-BA2A,
BA0B-BA2B
O
Bank Active: Used to select the bank within a rank.
RASA, RASB
CASA, CASB
WEA, WEB
O
O
O
O
Row Address Strobe: Used with CS, CAS, and WE to specify the SDRAM command.
Column Address Strobe: Used with CS, RAS, and WE to specify the SDRAM command.
Write Enable: Used with CS, CAS, and RAS to specify the SDRAM command.
CS0A-CS1A,
CS0B-CS1B
Chip Select: Used with CAS, RAS, and WE to specify the SDRAM command. These signals are
used for selecting one of two SDRAM ranks. CS0 is used to select the first rank and CS1 is
used to select the second rank.
CKE0A-CKE1A,
CKE0B-CKE1B
O
Clock Enable: DIMM command register enable.
156
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Signal Lists
Table 13-3. Pin Description (Sheet 2 of 2)
Signal
Type
Description
ODT0A, ODT0B
CLK[3:0]
O
O
DIMM On-Die-Termination: Dynamic ODT enables for each DIMM on the channel.
Clock: Clocks to DRAMs. CLK0 and CLK1 are always used. CLK2 and CLK3 are optional and
may be disabled when not required.
CLK[3:0]
O
Clock Complement: Clocks to DRAMs.
DDR Compensation
DDRC_C14
DDRC_B18
DDRC_C18
DDRC_B12
DDRC_C12
Clocking
A
A
A
A
A
DDR Compensation Common: Common return (ground) pin for DDRC_B18 and DDRC_C18
DDR Compensation Ball Resistor connected to Compensation Common above
DDR Compensation Ball Resistor connected to Compensation Common above
DDR Compensation Ball Resistor connected to VSS
DDR Compensation Ball Resistor connected to VDD
SCK
I
I
AMB Clock: This is one of the two differential reference clock inputs to the Phase Locked Loop
in the AMB core. Phase Locked Loops in the AMB will shift this to all frequencies required by
the core, DDR channels, and FBD Channel.
SCK
AMB Clock Complement: This is the other differential reference clock input to the Phase
Locked Loop in the AMB core. Phase Locked Loops in the AMB will shift this to all frequencies
required by the core, DDR channels, and FBD Channel.
VCCAPLL
A
A
VCC: PLL Analog Voltage for the core PLL (See Chapter 8, Clocking)
VSS: PLL Analog Voltage for the core PLL (See Chapter 8, Clocking)
VSSAPLL
System Management
SCL
I/O
I/O
SMBus Clock
SDA
SMBus Address/Data
DIMM Select ID
SA[2:0]
Reset
RESET#
Power Good Reset
Miscellaneous Test
TEST (6 pins)
TESTLO (3 pins)
TESTLO_AB20
NC
A
Pin for debug and test. Must be floated on DIMM.
Pin for debug and test. Must be tied to Ground on DIMM
A
Pin for debug and test. Connected to two resistors. One resistor is connected to VCCFBD,
the other resistor is connected to VSS.
TESTLO_AC20
A
Pin for debug and test. Connected to two resistors. One resistor is connected to VCCFBD,
the other resistor is connected to VSS.
Power Supplies
VCC (2pins)
VCCFBD (8 pins)
VDD (24 pins)
VSS (156 pins)
VDDSPD
A
A
A
A
A
1.5V nominal supply for core logic
1.5V nominal supply for FBD high speed I/O
1.8V nominal supply for DDR I/O
Ground
3.3V nominal supply for SMB receivers and ESD diodes
Other Pins
BFUNC
I
Buffer Function Bit: When BFUNC = 0, AMB is used as a regular buffer on FB-DIMM. When
BFUNC = 1, AMB is used as either a repeater or a buffer for LAI function. On FB-DIMM, BFUNC
is tied to Ground
“a”
RFU (18 pins)
NC
Reserved for Future Use. Must be floated on DIMM. RFU pins denoted by
for forwarded clocks in future AMB implementations.
are reserved
Other No Connect Pins
NC (129 pins)
NC
No Connect pins
Intel® 6400/6402 Advanced Memory Buffer Datasheet
157
Signal Lists
Table 13-4 lists the signal types and pin counts.
Table 13-4. Pin Count
Signal
Pin Count
Channel Interface
DRAM Interface
DDR Compensation
Clocking
97
170
5
5
System Management
Reset
5
1
Miscellaneous Test
Power Supplies
Other Pins
11
213
19
526
129
655
Sub-total
Other No Connect Pins
Total
§
158
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14 Registers
14.1
Access Mechanisms
The Intel 6400/6402 Advanced Memory Buffer (AMB) component supports PCI
configuration space access as defined in the PCI Local Bus Specification, Rev.2.2. The
internal registers of the AMB can be accessed in byte (8-bit), word (16-bit), or double
word (32-bit) quantities. All multi-byte numeric fields use “little-endian” ordering (that
is, lower addresses contain the least significant parts of the field). As a memory buffer
(not a PCI device or bridge) the AMB is not fully compliant with this mechanism with
respect to the standard registers (those with offsets 0-3Fh).
The AMB will not be mapped into the host system's PCI Plug and Play hierarchy, but is
accessed through a method that is host controller implementation specific.
Problems will occur if the host system maps the registers into the PCI PnP hierarchy.
Configuration accesses are transported on the FBD link as configuration read and write
commands, which mimic the corresponding PCI commands. The AMB responds to any
device encoded in an FBD command. The AMB responds only to SM Bus requests that
match the NodeID. The “Device:” mentioned in the heading of each configuration
register table does not designate the PCI device; it designates the SM Bus node.
14.1.1
14.1.2
Conflict Resolution and Usage Model Limitations
AMB accepts configuration register reads and writes through the FBD link and through
SMBus transactions. In Logic Analyzer Interface (LAI) mode, registers are not
accessible through the in-band FBD link configuration read/write commands.
Registers do not incur read side-effects.
FBD Data on Configuration Read Returns
FBD read return data from the AMB is described in the FB-DIMM Architecture and
Protocol Specification. Configuration reads are sent in northbound data frames. Only
the bottom four bytes of this data are defined for a configuration access. The rest of the
bytes in the read return are undefined. Legal CRCs are generated for these undefined
inbound bytes.
14.1.3
Non-Existent Register Bits
To comply with the PCI specification, accesses to non-existent registers and bits will be
treated as follows:
Table 14-1. Access to “Non-existent” Register Bits
Access to
Writes
Have no effect
Have no effect
Reads
AMB returns -1
Registers in unimplemented functions
Registers not listed
AMB returns all zeroes
Software must read-modify-
write to preserve the value
AMB returns implementation
specific values
Reserved bits in registers
Intel® 6400/6402 Advanced Memory Buffer Datasheet
159
Registers
14.1.4
Register Attribute Definition
Table 14-2. Register Attributes Definitions
Attribute
Read Only
Abbreviation
RO
Description
This bit is set by the hardware. Software can only read the bit. Writes to
the register have no effect.
Write Only
Read/Write
WO
The bit is not implemented as a bit. The write causes some hardware
event to take place. Read returns all zeroes.
RW
The bit can be read or written by software.
Read/Write /
Clear
RWC
The bit can be either read or cleared by software. In order to clear a bit,
the software must write a one to it. Writing a zero to an RWC bit will have
no effect. Hardware will set this bit.
Read/Write /
Set
RWS
The bit can be either read or set by software. In order to set this RWS bit,
the software must write a one to it. Writing a zero to an RWS bit will have
no effect. Hardware will clear this bit.
Read/Write
Lock
RWL
The bit can be read and written by software. Hardware or a configuration
bit can lock this bit and prevent it from being updated.
Read/Write
Once
RWO
The bit can be read by software. It can also be written by software but the
hardware prevents writing/setting it more than once without a prior
“effective” reset. This protection applies on a byte-by-byte basis. For
example, if a two-bit RWO field straddles a byte boundary and only one
byte is written, then the written bit cannot be rewritten (unless reset).
However, the unwritten bit can still be written once. This is a special form
of RWL
Read/Restricted RRW
Write
The bit field can be read by software. Only a restricted set of values can
be written through a configuration write in-band from the host. Illegal
values will be aborted and dropped.
Sticky
All of the above
The bit is “sticky” or unchanged by a link reset. These bits can only be
defaulted by a power-up reset.
with “ST”
appended to the
end
Reserved
RV
This bit is reserved for future expansion and must not be written. The PCI
Local Bus Specification, Revision 2.2 requires that reserved bits must be
preserved. Any software that modifies a register that contains a reserved
bit is responsible for reading the register, modifying the desired bits, and
writing back the result.
160
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.1.5
Binary Number Notation
When references are made to binary numbers, the following notation is used:
n’bXX
n - number of digits
b - indicates binary
XX - binary value
For example, 2’b01 is two binary digital of value “01”.
14.1.6
Function Mapping
The following functions are described in this chapter:
0) PCI Standard Header Identification Registers
1) FBD Link Registers
2) Implementation Specific FBD Registers
3) DDR and Miscellaneous Registers
4) Implementation Specific DDR Initialization and Calibration Registers
5) DFX Registers
6) Bring-up and Debug Registers
Table 14-3. Function Mapping Legend
Fill
Description
RegName
Required Architected Register”RegName” in these bytes
Reserved Register for future architecture in these bytes
Reserved
RegName
Optional Architected Register”RegName” in these bytes
•
No Implementation Specific Registers usage
recommended
Unused Register location available for Implementation
Specific use
Intel® 6400/6402 Advanced Memory Buffer Datasheet
161
Registers
Table 14-4. Function 0: PCI Standard Header Identification Registers
DID
VID
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
44h
48h
4Ch
50h
54h
58h
5Ch
60h
64h
68h
6Ch
70h
74h
78h
7Ch
80h
84h
88h
8Ch
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
C4h
C8h
CCh
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
FCh
CCR
HDR
RID
RESERVED
162
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-5. Function 1: FBD Link Registers
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
80h
84h
88h
8Ch
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
CBC
EMASK
FERR
NERR
RECCFG
RECFBD1
RECFBD3
RECFBD0
RECFBD2
RECFBD5
RECFBD4
RECFBD7
RECFBD6
RECFBD9
RECFBD8
SPDPAR23NXT
SPDPAR67NXT
SPDPAR01NXT
SPDPAR45NXT
SPDPAR89NXT
SPDPAR1011NXT
SPDPAR
13NXT
SPDPAR
12NXT
FBDS3
FBDS2
FBDS1
FBDS0
40h
44h
48h
4Ch
SPDPAR23CUR
SPDPAR67CUR
SPDPAR1011CUR
SPDPAR01CUR
SPDPAR45CUR
SPDPAR89CUR
C0h
C4h
C8h
CCh
SPDPAR
13CUR
SPDPAR
12CUR
LINKPARCUR
LINKPARNXT
FBDNBC
FGCUR
FBDSBC
FGCUR
50h
54h
D0h
D4h
FBDNBC
FGNXT
FBDSBC
FGNXT
58h
5Ch
60h
64h
D8h
DCh
E0h
E4h
E8h
MODES
FEATURES
FBDLIS
FBDLOCKTO
FBDHAC
68h C2DINCRC
UR
C2DINCR
NXT
CMD2DAT CMD2DA
ACUR TANXT
FBDLS
6Ch
ECh
F0h
RECALDU 70h
R
74h
F4h
F8h
SYNCTR 78h
AININT
NBCALSTATUS
SBCALSTATUS
7Ch
FCh
Intel® 6400/6402 Advanced Memory Buffer Datasheet
163
Registers
Table 14-6. Function 2: Implementation Specific FBD Registers
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
44h
48h
4Ch
50h
54h
58h
5Ch
60h
64h
68h
6Ch
70h
74h
78h
7Ch
80h
84h
88h
8Ch
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
C4h
C8h
CCh
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
FCh
164
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-7. Function 3: DDR and Miscellaneous Registers
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
44h
48h
4Ch
50h
54h
58h
5Ch
60h
64h
68h
6Ch
70h
74h
78h
7Ch
UPDATED
TEMPHI
TEMPMID
TEMP
TEMPLO
80h
84h
88h
8Ch
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
C4h
C8h
CCh
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
FCh
TEMPSTAT
MB_START_ADDR
MB_END_ADDR
MB_LFSR
MBFADDRPTR
MB_ERR_DATA00
MB_ERR_DATA01
MB_ERR_DATA02
MB_ERR_DATA03
MBCSR
MB_ERR_DATA04
MBADDR
MBDATA0
MBDATA1
MBDATA2
MBDATA3
MBDATA4
MBDATA5
MBDATA6
MBDATA7
MBDATA8
MBDATA9
DAREFTC
MTR
DSREFTC
DRT
DRC
Intel® 6400/6402 Advanced Memory Buffer Datasheet
165
Registers
Table 14-8. Function 4: Implementation Specific DDR Initialization and Calibration
Registers
DCALDATA5
9
DCALDATA5
8
DCALDATA5
7
DCALDATA5
00h
04h
08h
0Ch
80h
84h
88h
8Ch
6
DCALDATA6
3
DCALDATA6
2
DCALDATA6
1
DCALDATA6
0
DCALDATA6
7
DCALDATA6
6
DCALDATA6
5
DCALDATA6
4
DCALDATA7
1
DCALDATA7
0
DCALDATA6
9
DCALDATA6
8
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
DDBISTLM
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
RCVENAC
DSRETC
DQSFAIL1
DRRTC00
DRRTC01
DQSOFCS00
DQSOFCS01
DQSOFCS10
DQSOFCS11
DCALCSR
DQSOFC DQSOFC
S12 S02
DRRTC0
2
DCALADDR
44h
48h
DRAMDLLC
WPTRTC0
C4h
C8h
DCALDATA DCALDATA DCALDATA DCALDATA
3
2
1
0
DCALDATA DCALDATA DCALDATA DCALDATA 4Ch
WPTRT
C1
CCh
7
6
5
4
DCALDATA DCALDATA DCALDATA DCALDATA
11 10
50h
54h
58h
DDQSCVDP0
DDQSCVDP1
DDQSCADP0
DDQSCADP1
DRRTC00
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
FCh
9
8
DCALDATA DCALDATA DCALDATA DCALDATA
15 14 13 12
DCALDATA DCALDATA DCALDATA DCALDATA
19 18 17 16
DCALDATA DCALDATA DCALDATA DCALDATA 5Ch
23 22 21 20
DCALDATA DCALDATA DCALDATA DCALDATA
27 26 25 24
60h
64h
68h
6Ch
70h
74h
78h
7Ch
DCALDATA DCALDATA DCALDATA DCALDATA
31
30
29
28
DCALDAT
A35
DCALDAT
A34
DCALDAT
A33
DCALDAT
A32
FIVESREG
AAAAREG
DCALDAT
A39
DCALDAT
A38
DCALDAT
A37
DCALDAT
A36
DCALDAT
A43
DCALDAT
A42
DCALDAT
A41
DCALDAT
A40
DIOMON
ODTZTC
DCALDAT
A47
DCALDAT
A46
DCALDAT
A45
DCALDAT
A44
DCALDAT
A51
DCALDAT
A50
DCALDAT
A49
DCALDAT
A48
DRAMISCTL
DCALDAT
A55
DCALDAT
A54
DCALDAT
A53
DCALDAT
A52
DDR2O
DTC
166
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-9. Function 5: DFX Registers
RESERVED
RESERVED
RESERVED
RESERVED
00h
04h
08h
0Ch
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
44h
48h
4Ch
50h
54h
58h
5Ch
60h
64h
68h
6Ch
70h
74h
78h
7Ch
80h
84h
88h
8Ch
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
C4h
C8h
CCh
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
FCh
LAI
TRANSCFG
SBMATCHU
SBMATCHL0
SBMATCHL1
SBMATCHL2
SBMASKU
TRANDERR1
TRANDERR3
TRANDERR5
TRANDERR7
TRANDERR0
TRANDERR2
TRANDERR4
TRANDERR6
TRANDERR8
SBMASKL0
SBMASKL1
SBMASKL2
MMEVENTSEL
EVENTSEL0
EVENTSEL1
EVENTSEL2
EVENT
EVBUS
STUCKL
EICNTL
Intel® 6400/6402 Advanced Memory Buffer Datasheet
167
Registers
Table 14-10.Function 6: Bring-up and Debug Registers
Register Bit Location
RESERVED
04h
10h
14h
18h
1Ch
20h
24h
28h
2Ch
30h
34h
38h
3Ch
40h
44h
48h
4Ch
50h
54h
58h
5Ch
60h
64h
68h
6Ch
70h
74h
78h
SBFIBPGCTL
SBFIBRXMSK
84h
90h
94h
98h
9Ch
A0h
A4h
A8h
ACh
B0h
B4h
B8h
BCh
C0h
C4h
C8h
CCh
D0h
D4h
D8h
DCh
E0h
E4h
E8h
ECh
F0h
F4h
F8h
SBFIBTXSHFT
SBFIBRXSHFT
SBFIBRXLNERR
SBFIBPATTBUF2
SBFIBPATTBUF2EN
SBFIBINIT
SBIBISTMISC
NBFIBPORTCTL
NBFIBPGCTL
NBFIBPATTBUF1
NBFIBTXMSK
NBFIBRXMSK
NBFIBTXSHFT
NBFIBRXSHFT
NBFIBRXLNERR
NBFIBPATTBUF2
NBFIBPATTBUF2EN
NBFIBINIT
NBIBISTMISC
168
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.2
PCI Standard Header Identification Registers
(Function 0)
14.2.1
VID: Vendor Identification Register
This register identifies Intel as the manufacturer of the AMB.
Device:
Function:
Offset:
NodeID
0
00h
Bit
Attr
Default
Description
15:0
RO
8086h
Vendor Identification Number
The value assigned to Intel.
14.2.2
DID: Device Identification Register
These registers combined with the vendor identification register uniquely identifies the
AMB Devices.
Device:
Function:
Offset:
NodeID
0
02h
Bit
Attr
RO
Default
Description
15:0
A620h
Device Identification Number
Identifies each function of the AMB
14.2.3
RID: Revision Identification Register
This register contains the revision number of the AMB.
Device:
Function:
Offset:
NodeID
0
08h
Bit
Attr
RO
Default
10h
Description
Revision Identification Number: RID
7:0
“00h” = A0 stepping
“01h” = A1 stepping
“02h” = A2 stepping
“10h” = B0 stepping
Intel® 6400/6402 Advanced Memory Buffer Datasheet
169
Registers
14.2.4
CCR: Class Code Register
This register contains the Class Code for the AMB, specifying the device function.
Device:
Function:
Offset:
NodeID
0
09h
Bit
Attr
Default
Description
23:16
RO
RO
RO
05h
00h
00h
Base Class.
This field indicates the general device category. For the AMB, this field is hardwired
to 05h, indicating it is a “memory controller”.
15:8
7:0
Sub-Class.
This field qualifies the Base Class, providing a more detailed specification of the
device function. For the AMB, this field is hardwired to 00h, indicating it is a “RAM”.
Register-Level Programming Interface.
This field identifies a specific programming interface (if any), that device
independent software can use to interact with the device. There are no such
interfaces defined for “memory controllers”.
14.2.5
HDR: Header Type Register
This register identifies the header layout of the configuration space.
Device:
Function:
Offset:
NodeID
0
0Eh
Bit
Attr
Default
Description
7
RO
RO
1
Multi-function Device.
Selects whether this is a multi-function device, that may have alternative
configuration layouts. The AMB has more than the 256 bytes of configuration
registers allotted to a single function. Therefore, the AMB is defined to be a
multifunction device, and this bit is hardwired to 1.
6:0
00h
Configuration Layout.
This field identifies the format of the 10h through 3Fh space. The AMB uses header
type “00”: these bits are hardwired to 00h.
14.3
FBD Link Registers (Function 1)
14.3.1
FBD Link Control and Status
14.3.1.1
FBDS0: FBD Status 0
This register contains copies of status bits returned by the AMB in the most recent
northbound status frame when SYNC command R[1:0] field is 2’b00.
In the absence of SYNCs to this register, this register is not updated.
Device:
NodeID
Function: 1
Offset:
Bit
40h
Att
r
Default
Description
7:5
4
RV
RO
0h
0h
Reserved
SP: Parity: This bit contains an odd parity bit that covers the S[3:0] field.
170
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 1
Offset:
40h
Att
r
Bit
Default
Description
3
RO
RO
0h
S3: Northbound Debug Event (1 = asserted, 0 = inactive): This bit is
used to communicate debug events to the host.
2:1
0h
S[2:1]: Thermal Trip: This field indicates various thermal conditions of
the AMB as follows:
•
•
•
•
00 – Below TEMPLO
01 – Above TEMPLO
10 – Above TEMPMID and falling
11 – Above TEMPMID and rising
The TEMPLO threshold is generally used to inform the host to accelerate
refresh events. The TEMPMID threshold is generally used to inform the
host that a thermal limit has been exceeded and that thermal throttling is
needed. Refer to the RAS chapter for more details on thermal
management.
0
RO
0h
S0: ERROR Asserted: This bit indicates an error has been detected by the
AMB. Errors can be alert or other type.
14.3.1.2
FBDS1: FBD Status 1
This register contains copies of status bits returned by the AMB in the most recent
northbound status frame when SYNC command R[1:0] field is 2’b01.
Device:
NodeID
Function: 1
Offset:
Bit
41h
Att
r
Default
Description
7:5
4
RV
RO
0h
0h
Reserved
SP: Parity: This bit contains an odd parity bit that covers the
S[3:0] field.
3:1
0
RV
RO
0h
0h
Reserved
S0: Data Merge Error: This bit indicates that the northbound
data merge alignment logic of an intermediate AMB cannot
met the timing required to merge its DRAM data into the
northbound data stream when required. Refer to the
initialization chapter for details.
14.3.1.3
FBDS2: FBD Status 2
This register contains copies of status bits returned by the AMB in the most recent
northbound status frame when SYNC command R[1:0] field is 2’b10.
Device:
NodeID
Function: 1
Offset:
Bit
42h
Att
r
Default
Description
7:5
4
RV
RO
0h
0h
Reserved
SP: Parity: This bit contains an odd parity bit that covers the
S[3:0] field.
3:0
RV
0h
Reserved
Intel® 6400/6402 Advanced Memory Buffer Datasheet
171
Registers
14.3.1.4
FBDS3: FBD Status 3
This register contains copies of bits that were returned by the AMB in the most recent
northbound status frame when the SYNC command R[1:0] field is 2’b11. This can also
be written with an override value that will be returned if selected during SYNC
command.
Device:
NodeID
Function: 1
Offset:
Bit
43h
Att
r
Default
Description
7:6
5
RV
0h
0h
Reserved
RW
OVREN: Use values written by user.
Setting this bit causes the values specified in the lower 5 bits
of this register returned as-is if requested by SYNC command.
4
RW
RW
1h
0h
USRPAR: User Specified parity for USRVAL
USRVAL: User Specified value
3:0
14.3.1.5
MODES: Operating Mode
This register contains overview configuration status of chip.
Device:
NodeID
Function: 1
Offset:
5Ch
Att
r
Bit
Default
Description
7
RO
RO
RO
RO
RV
1
NORMAL:
•
1 = Normal AMB Buffer
6
5
0
0
0
0
LAI:
•
1 = LAI
REPEATER:
•
1 = Repeater
4
TRANSPARENT:
•
1 = Transparent Test Mode
3:0
Reserved
14.3.1.6
FEATURES: Capabilities
This register reports optional capabilities of this DIMM.
Device:
NodeID
Function: 1
Offset:
Bit
60h
Attr
Default
Description
31:15
14:11
RV
RO
0h
Reserved
DDRFREQ: DDR2 frequencies supported
0011
•
•
•
•
1XXX = reserved
X1XX = DDR2-800
XX1X = DDR2-667
XXX1 = DDR2-533
172
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 1
Offset:
60h
Bit
Attr
Default
Description
VARLAT: Variable Read Latency Mode
10
RO
0
•
•
1 = Support Variable Read Latency on data returns
0 = Not supported
9
8
RO
RO
RO
RO
1
0
LAI: Logic Analyzer Interface Mode
•
•
1 = Support remapping DDR interface as Logic Analyzer Interface
0 = Not supported
DMASK: Data Mask for non-ECC Write Data
•
•
1 = Support data mask with non-ECC Write
0 = Not supported
7
0
L0S: Low Power Link State
•
•
1 = Support L0s state
0 = Not supported
6:2
1Eh
NBWC: Northbound Width Capability
•
•
•
•
1XXXX = 14 bits NB width supported
X1XXX = 14bits fail over to 13 bits mode supported.
XX1XX = 13 bits NB width supported
XXX1X = 13 bits fail over to 12 bits mode supported.
1:0
RO
01
SBWC: Southbound Width Capability
•
X1 = 10 SB bits: Device supports 10-bits and 10-bit fail-over to 9-bits.
Both configurations deliver 72-bits of data payload frame.
•
1X = Reserved
14.3.1.7
FBDLIS: FBD Link Initialization Status
This register reports FBD initialization status and is only valid when the link is up since
it is not sticky.
Device:
NodeID
Function: 1
Offset:
Bit
64h
Attr
Default
Description
31:20
19
RV
RO
0
0
Reserved
DATAMERGEERROR: NorthBound Data Merge Error
1 = NB merge error
•
18
ROST
0
NBMERGEDIS: NorthBound Merge Disable
Set by TS2 packet addressed to it
•
•
1 = Disable NB merge
Note: state in AMB should be sticky through fast link reset until new TS2
resets bit or hard pin reset
17:12
RO
3Fh
NBWCFG: Northbound width configuration set by TS3
•
•
See table in FBD Architecture & Protocol Specification for full decoding
[5:4] = Selects 14, 13 or 12 lane operation.
= Protocol Selection[1:0] out TS3 Protocol Selection[3:0]
[3:0] - Selects none or one lane to map out
•
= NB Channel Configuration [3:0] in TS3
11:8
7
RO
RV
Fh
0
SBWCFG: Southbound width capability set by TS3
•
•
See Table in FBD Architecture & Protocol Specification for full decoding
[3:0] - Selects none or one lane to map out
Reserved
Intel® 6400/6402 Advanced Memory Buffer Datasheet
173
Registers
Device:
NodeID
Function: 1
Offset:
64h
Bit
Attr
Default
Description
6
RO
0
TS2RESP: Responded to a TS2 packet addressed to it
1: TS2 was addressed to this AMB
•
•
In polling mode - DS matches TS2 AMB_ID value
Undefined in other states
5
RO
0
SB2NBLBMAP: Specifies if upper or lower SB lanes are reflected in
TS1
Valid only during testing phase (TS1)
1 = upper SB bit lanes
0 = lower SB lanes
4
RO
RO
0
LASTAMBFLAG: Indicates if this AMB is acting like the last AMB
•
•
•
In Disable, Calibrate - always 0.
In training - Set if DS matches TS0 AMB_ID value
Retains value after training till next reset.
3:0
0h
LINITST: Link initialization state
Encoding is
•
•
•
•
•
•
•
•
•
0000 - Disable
0001 - Calibrate
0010 - Training
0011 - Testing
0100 - Polling
0101 - Config
0110 - L0
0111 - L0s
1000 - Recalibrate
174
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.3.1.8
FBDSBCFGNXT: FBD SB Link Electrical Configuration
This register contains next settings of control bits to set link electrical parameters to
match link length and frequency characteristics.
Device:
NodeID
Function: 1
Offset:
Bit
54h
Attr
Default
Description
7:5
4:3
RV
0h
00
Reserved
RWST
SBTXDRVCUR:
‘11’ = Small
‘10’ = reserved
‘01’ = Regular
‘00’ = Large
2:1
RWST
RWST
10b
1b
SBTXDEEMP:
00 = 0 dB
01 = 3.5dB
10 = 6dB
11 = 9.5dB
0
SBRESYNCEN:
‘1’ = SB pass-thru data is in Re-sync mode
‘0’ = SB pass-thru is in Re-sample mode.
14.3.1.9
FBDNBCFGNXT: FBD NB Link Electrical Configuration
This register contains next settings of control bits to set link electrical parameters to
match link length and frequency characteristics.
Device:
NodeID
Function: 1
Offset:
Bit
55h
Attr
Default
Description
7:5
4:3
RV
0h
00
Reserved
RWST
NBTXDRVCUR:
‘11’ = Small
‘10’ = reserved
‘01’ = Regular
‘00’ = Large
2:1
RWST
RWST
10b
1b
NBTXDEEMP:
00 = 0 dB
01 = 3.5dB
10 = 6dB
11 = 9.5dB
0
NBRESYNCEN:
‘1’ = SB pass-thru data is in Re-sync mode
‘0’ = SB pass-thru is in Re-sample mode.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
175
Registers
14.3.1.10 LINKPARNXT: FBD Link Frequency
This register contains current settings of control bits to set link electrical parameters to
match link length and frequency characteristics.
Device:
NodeID
Function: 1
Offset:
Bit
56h
Attr
Default
Description
15:2
1:0
RV
0h
Reserved
CFREQ: Current Link Frequency
RWST
•
•
•
•
11 = DDR2-800
10 = DDR2-667
01 = DDR2-533
00 = Uninitialized
14.3.1.11 FBDSBCFGCUR: FBD SB Link Electrical Configuration
This register contains current settings of control bits to set link electrical parameters to
match link length and frequency characteristics.
Device:
NodeID
Function: 1
Offset:
Bit
50h
Attr
Default
Description
7:5
4:3
RV
0h
Reserved
ROST
00b
SBTXDRVCUR:
‘11’ = Small
‘10’ = reserved
‘01’ = Regular
‘00’ = Large
2:1
ROST
ROST
10b
SBTXDEEMP:
00 = 0 dB
01 = 3.5dB
10 = 6dB
11 = 9.5dB
0
1
SBRESYNCEN:
‘1’ = SB pass-thru data is in Re-sync mode
‘0’ = SB pass-thru is in Re-sample mode.
176
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.3.1.12 FBDNBCFGCUR: FBD NB Link Electrical Configuration
This register contains current settings of control bits to set link electrical parameters to
match link length and frequency characteristics.
Device:
NodeID
Function: 1
Offset:
Bit
51h
Attr
Default
Description
7:5
4:3
RV
0h
00
Reserved
ROST
NBTXDRVCUR:
‘11’ = Small
‘10’ = reserved
‘01’ = Regular
‘00’ = Large
2:1
ROST
ROST
10b
NBTXDEEMP:
00 = 0 dB
01 = 3.5dB
10 = 6dB
11 = 9.5dB
0
1
NBRESYNCEN:
‘1’ = SB pass-thru data is in Re-sync mode
‘0’ = SB pass-thru is in Re-sample mode.
14.3.1.13 LINKPARCUR: FBD Link Frequency
This register contains current settings of control bits to set link electrical parameters to
match link length and frequency characteristics
Device:
NodeID
Function: 1
Offset:
Bit
52h
Attr
Default
Description
15:2
1:0
RV
0h
01
Reserved
CFREQ: Current Link Frequency
ROST
•
•
•
•
11 = DDR2-800
10 = DDR2-667
01 = DDR2-533
00 = Reserved
Intel® 6400/6402 Advanced Memory Buffer Datasheet
177
Registers
14.3.1.14 FBDLOCKTO: FBD Bit Lock Time Out Register
This register contains the bit lock time out value. This value is used by the to figure out
when it should stop waiting for lanes to bit lock and make forward progress. The
register also contains the width that the host is going to be starting with on the NB
side. This will be used to mask off lanes for initial bit lock decision
Device:
NodeID
Function: 1
Offset:
68h
Bit
Attr
Default
Description
BLTOCNT: Bit Lock Time Out Counter
15:2
RWST
0594h
default: 1428 frames
1:0
RWST
0h
NBLINKCFG: Northbound Link Config
00 = 14 lane
01 = 13 lane
10 = 12 lane
11 = reserved
14.3.1.15 FBDHAC: FBD Hot Add Control
This register contains control to aid in hot add functionality.
Device:
NodeID
Function: 1
Offset:
Bit
6Ch
Attr
Default
Description
7:2
1
RV
RO
0
0
Reserved
NB_DATA_ALL_ONES_FLAG:
•
•
1 = Receiving ones on sufficient NB lanes to support init
0 = Not receiving calibrate handshake on NB Rx
0
RW
0
DRIVE_ONES_SB:
•
•
1 = Enable SB Tx Outputs and drive one’s
0 = Normal operation
14.3.1.16 FBDLS: FBD Link Status
This register reports AMB FBD link status.
Device:
NodeID
Function: 1
Offset:
Bit
6Eh
Attr
Default
Description
7:3
2
RV
RO
0h
0
Reserved
NLQS: Northbound Lane Electrical Status
‘1’ = Northbound lanes are quiesced
‘0’ = Northbound lanes are active
1
0
RO
RO
0
0
SLQS: Southbound Lane Electrical Status
‘1’ = Southbound lanes are quiesced
‘0’ = Southbound lanes are active
LNKRDY: Link Ready
‘1’ = FBD link is ready to accept requests and deliver responses
‘0’ = FBD link is not ready
178
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.3.1.17 RECALDUR: FBD Recalibrate Duration
This register determines the duration of the Recalibration state between 32 and 42
frames. During recalibration state all commands and CRC are ignored.
Device:
Function: 1
Offset: 70h
NodeID
Bit
Attr
Default
Description
7
RV
0
Reserved
6:1
RW
0h
Recalibrate_Duration: This field sets the duration of the Recalibrate
state once a sync command with the ERC bit. set is received. Legal
values are between 32 and 42. Functionality if set outside this
range is undefined.
•
•
•
•
•
> ‘42d (101010b) = undefined
= ‘42d (101010b) = ignore for 42 frames after Sync
....
= 32d (100000b) = ignore for 32 frames after Sync
<32d (100000b) = undefined
0
RV
0
Reserved
14.3.1.18 SYNCTRAININT: SYNC Train Interval register
This register sets the typical spacing of sync commands on the link.
Device:
NodeID
Function: 1
Offset:
78h
Bit
Attr
Default
Description
7:0
RWST
2Ah
SyncTrainInt: This field sets the min spacing for sync cmds
default value 42d (101010b)
min value 32, max value=255
14.3.1.19 SBCALSTATUS: Southbound Calibration Status
This register contains the pass/fail information of the last calibration on a per lane basis
for the southbound. The AMB is expected to log the information when it is asked to go
through calibration. The register is always cleared when entering the calibration state.
This register will be used for debug purposes.
Device:
NodeID
Function: 1
Offset:
Bit
7Ch
Attr
Default
Description
15:10
9:0
RV
0h
0h
Reserved
RWST
CALSTATUS: Calibration status
0 - Pass
1 - Fail
Intel® 6400/6402 Advanced Memory Buffer Datasheet
179
Registers
14.3.1.20 NBCALSTATUS: Northbound Calibration Status
This register contains the pass/fail information of the last calibration on a per lane basis
for the southbound. The AMB is expected to log the information when it is asked to go
through calibration. The register is always cleared when entering the calibration state.
This register will be used for debug purposes.
Device:
NodeID
Function: 1
Offset:
Bit
7Eh
Attr
Default
Description
15:14
13:0
RV
0h
0h
Reserved
RWST
CALSTATUS: Calibration status
0 - Pass
1 - Fail
14.3.2
SM Bus Register
Since the AMB will never be a master on the SM Bus and will never write to the
EEPROM, SM Bus registers related to being a master are not required.
14.3.2.1
CBC: Chip Boot Configuration
This register reports AMB DIMM ID from pins BFUNC, SA[2:0]. SM Bus NodeID can be
calculated from the DIMM ID as follows:
If DIMMID[3] = 0: (BFUNC =0) Normal DIMM
• NODEID[6:3] = “101_1” or “B”
NODEID[2:0] = DIMMID[2:0] the value from pins SA[2:0]
If DIMMID[3] = 1: (BFUNC =1) Repeater or LAI
• NODEID[6:3] = “001_1” or “3”
NODEID[2:0] = DIMMID[2:0] the value from pins SA[2:0]
Device:
NodeID
Function: 1
Offset:
Bit
88h
Attr
Default
Description
7:4
3:0
RV
RO
0
0
Reserved
DIMMID: SM Bus NodeID
Value from pins BFUNC, SA[2:0]
180
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.3.3
Error Registers
14.3.3.1
EMASK: Error Mask
This register masks errors in the FERR and NERR registers as well as disabling some
types of error detection. A ‘0’ in any field enables that error. A ‘1’ in any field masks
(disables) that error. Multiple bits can be set in this register. An enabled error sets
error status, updates error logs, and generates link signals. A masked error does not
affect error status, error logs, or link signals.
Device:
NodeID
Function: 1
Offset:
Bit
8Ch
Attr
Default
Description
31:8
RV
0
1
1
1
Reserved
Reserved
Reserved
7
6
5
RWST
RWST
RWST
INJERR: Error Injection has sourced an injected error bit in the status
return field (optional)
4
3
RWST
RWST
1
0
INJALERT: Error Injection has sourced an injected alert error (optional)
FEWEDGES: tClk Training Violation (no sync cmd for 2x SYNCTRAININT -
typically 84 frames)
2
1
0
RWST
RWST
RWST
1
1
0
OVERTEMP: Temp > TEMPHI and temp enabled
UNIMPLCFG: Unimplemented Configuration Address
CMDCRCERR: SB CRC Error
14.3.3.2
FERR: First Error
This register contains bits specifying which errors occurred first as related to the FBD
channel.
Device:
NodeID
Function: 1
Offset:
Bit
90h
Attr
Default
Description
31:8
RV
0
Reserved
7
RWCST
0
WBUFOVFL: Write Buffer overflow
- Implementation Specific - only supported for debug
6
5
RWCST
RWCST
0
0
WPLDERR: Wrong Number of Write Payloads (Buffer Underflow)
- Implementation Specific - only supported for debug
INJERR: Error Injection has sourced an injected error bit in the status
return field (optional)
4
3
RWCST
RWCST
0
0
INJALERT: Error Injection has sourced an injected alert error (optional)
FEWEDGES: tClk Training Violation (no sync cmd for2x SYNCTRAININT -
typically 84 frames)
Logs in RECFBD registers. Sends Alerts NB. Triggers auto self refresh SM.
2
1
RWCST
RWCST
0
0
OVERTEMP: Temp > TEMPHI and temp enabled
Fatal. AMB shuts down.
UNIMPLCFG: Unimplemented Configuration Address
Correctable. Logs in RECCFG* registers. AMB drops the command.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
181
Registers
Device:
NodeID
Function: 1
Offset:
90h
Bit
Attr
Default
Description
0
RWCST
0
CMDCRCERR: SB CRC Error
Correctable. Logs in RECFBD registers. AMB drops the current command and
sources alerts.
14.3.3.3
NERR: Successive Error
This register is used to report successive errors. More than two bits can be set in this
register. This register contains bits specifying which errors occurred as related to the
FBD channel.
Device:
NodeID
Function: 1
Offset:
Bit
94h
Attr
Default
Description
31:8
RV
0
0
0
0
Reserved
Reserved
Reserved
7
6
5
RWCST
RWCST
RWCST
INJERR: Error Injection has sourced an injected error bit in the status
return field (optional)
4
3
RWCST
RWCST
0
0
INJALERT: Error Injection has sourced an injected alert error (optional)
FEWEDGES: tClkTraining Violation (no sync cmd for 2x SYNCTRAININT -
typically 84 frames)
Logs in RECFBD registers. Sends Alerts NB. Triggers auto self refresh SM.
2
1
0
RWCST
RWCST
RWCST
0
0
0
OVERTEMP: Temp > TEMPHI and temp enabled
Fatal. AMB shuts down.
UNIMPLCFG: Unimplemented Configuration Address
Correctable. Logs in RECCFG* registers. Drops the command.
CMDCRCERR: SB CRC Error
Correctable. Logs in RECFBD registers. Drops the current command and sources
alerts.
14.3.3.4
RECCFG: Configuration Register Error Log
This register contains the received address for an unimplemented configuration register
access error. The contents of this register are only valid when the error that set this
register is logged in the FERR or NERR register.
Device:
NodeID
Function: 1
Offset:
Bit
98h
Attr
Default
Description
15:13
12:10
RV
0
Reserved
function:
RWST
0h
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 1
Offset:
98h
Bit
Attr
Default
Description
9:8
RWST
0h
size:
00 = one byte
01 = two bytes
10 = three bytes
11 = four bytes
Note: This field only defined for errors on Config Register Writes. This
field is undefined for other transactions.
7:0
RWST
0h
register address:
14.3.3.5
RECFBD[9:0]: FBD Error Log
.This register contains FBD frame data received that matches the logged frame error.
Captures {BC} from frame N and A from frame N+1 where
[11:8] = A[n+1]
[7:4] = C[n] slot
[3:0] = B[n] slot
The contents of this register are only valid when one of the errors that set this register
is logged in the FERR register. The contents of this register should not change until the
error indication is cleared from the FERR register.
Device:
NodeID
Function: 1
Offset:
Bit
AEh, ACh, AAh, A8h, A6h, A4h, A2h, A0h, 9Eh, 9Ch
Attr
Default
Description
15:12
11:0
RV
0
0
Reserved
FRMDATA: Frame data for lane n
RWST
14.3.4
PERSONALITY BYTES Loaded From the SPD
These bytes allow for AMB implementation specific settings to be loaded in an
architected way by BIOS without BIOS being aware of specific AMB requirements. Each
AMB vendor defines how these bytes should be loaded for the specific DIMM being built.
The values to be loaded into these bytes are stored in the SPD EEPROM on the DIMM.
The first six bytes are required to be loaded into the AMB via SMBus before link
initialization to allow for configuration information needed for robust link operation.
The remaining 8 bytes must be loaded before the FBD begins normal operation.
Usage of these bytes can include
• DDR electrical parameters to optimize performance on a given DIMM
— For example, DLL delay settings, various I/O driver slew settings,
• Enable/disable of various optimizations that may have been included in the design
but can be turned off if they are not needed on this DIMM or they have
unanticipated side effects - for example, power save modes, alternate clock
recovery algorithms, and so forth.
• Temperature Sensor offsets
Intel® 6400/6402 Advanced Memory Buffer Datasheet
183
Registers
• Internal clock domain phase offsets
14.3.4.1
PERSBYTE[13:0]NXT: Personality Bytes
These bytes are loaded from SPD bytes 114:101 respectively.
(PERSBYTE13NXT = SPD byte 114, ... , PERSBYTE0NXT = SPD byte 101)
Function: 1
Offset:
BDh:B0h
Bit
Attr
RWST
Default
Description
7:0
0
PData: Personality Data Byte
Implementation specific registers
14.3.4.2
PERSBYTE[13:0]CUR: Personality Bytes
Function: 1
Offset:
BDh:B0h
Bit
Attr
ROST
Default
Description
7:0
0
PData: Personality Data Byte
Implementation specific registers
14.3.5
Hardware Configuration Registers
14.3.5.1
CMD2DATANXT: Next Value of Command to Data Delay
This register has the next value of the command to data delay. This will be used after
the next fast reset. For correct DIMM operation, CMD2DATA may be limited to a subset
of the architecturally valid values. The allowed values are AMB specific and may vary
with frequency. Values come from SPD.
Device:
NodeID
Function: 1
Offset:
E8h
Bit
Attr
Default
Description
7:4
RWST
0h
DLYFRMS: Number of frames
This specifies full frame delay part of the command to data delay.
0 - 9: Valid delays
10 - 15: Reserved
3:0
RWST
0h
DLYFRAC: Fractional delay of command to data
This specifies fractional frame delay part of the command to data delay.
0 - 11: Specifies the delay in 1UI increments
12 - 15: Reserved
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.3.5.2
CMD2DATACUR: Current Value of Command to Data Delay
This register has the current value of the command to data delay.
Device:
NodeID
Function: 1
Offset:
E9h
Bit
Attr
Default
Description
7:4
ROST
0h
DLYFRMS: Number of frames
This specifies full frame delay part of the command to data delay.
0 - 9: Valid delays
10 - 15: Reserved
3:0
ROST
0h
DLYFRAC: Fractional delay of command to data
This specifies fractional frame delay part of the command to data delay.
0 - 11: Specifies the delay in 1UI increments
12 - 15: Reserved
14.3.5.3
C2DINCRNXT: Next Value of Command to Data Delay Increment
This register has the next value of the command to data incremental delay. This will be
used after the next fast reset. This will be used by the last AMB to delay driving the
data beyond that specified in the command to data delay.
Device:
NodeID
Function: 1
Offset:
Bit
EAh
Attr
Default
Description
7:2
1:0
RV
0h
0h
Reserved
RWST
INCRDLY: Incremental Delay for command to data
0 - 3: Specifies the incremental delay in frames
14.3.5.4
C2DINCRCUR: Current Value of Command to Data Delay Increment
This register has the current value of the command to data incremental delay. This will
be used by the last AMB to delay driving the data beyond that specified.
Device:
NodeID
Function: 1
Offset:
Bit
EBh
Attr
Default
Description
7:2
1:0
RV
0h
0h
Reserved
ROST
INCRDLY: Incremental Delay for command to data
0 - 3: Specifies the incremental delay in frames
14.4
Implementation Specific FBD Registers (Function
2)
No register information is available for the implementation specific registers.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
185
Registers
14.5
DDR and Miscellaneous Registers (Function 3)
14.5.1
Memory Registers
14.5.1.1
DAREFTC: DRAM Auto-Refresh Timing and Control
Device:
NodeID
Function: 3
Offset:
Bit
70h
Attr
Default
Description
31
30
29
28
RV
0
0
0
0
Reserved
RWST
RWST
RWST
REFDERR: refresh buffer overflow error
REFIERR: buffer count greater than the number of installed ranks
ORIDEHS: override handshake; auto-refresh wins arbitration for
command bus
27:24
23:16
15
RWST
RWST
RW
0
4Eh
0
RBUF: number of pending refreshes for all ranks combined
TRFC: DRAM refresh period
AREFEN: auto-refresh enable
14:0
RWST
0C30h
TREFI: DRAM refresh interval
14.5.1.2
DSREFTC: DRAM Self-Refresh Timing and Control
Device:
NodeID
Function: 3
Offset:
Bit
74h
Attr
Default
Description
23:17
16
RV
0
1
Reserved
RWST
RWST
RWST
RV
DISSREXIT: Disable DRAM Self-Refresh Exit when the link comes up
TXSNR: DRAM Self-Refresh Exit to Non-Read Command Timing
TRP: DRAM Precharge Timing
15:8
7:4
3
56h
Fh
0
Reserved
2:0
RWST
7h
TCKE: DRAM Minimum CKE Pulse Width
14.5.1.3
MTR: Memory Technology Register
This register provides a local definition of the organization of DIMMs. This DRAM
configuration information is used for MemBIST and DDR calibration.
Device:
NodeID
Function: 3
Offset:
Bit
77h
Attr
Default
Description
7
6
RV
0
0
Reserved
RWST
WIDTH: Technology – DRAM data width
Define the data width of SDRAMs within these DIMM’s
0 = x4 (4 bits wide)
1 = x8 (8 bits wide)
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 3
Offset:
77h
Bit
Attr
Default
Description
NUMRANK: Technology – Number of Ranks
5
RWST
0
Define the number of ranks within these DIMM’s
0 = single ranked
1 = double ranked
4
RWST
RWST
0
NUMBANK: Technology – Number of Banks
Define the number of banks within these DIMM’s
0 = 4 banks
1 = 8 banks
3:2
00
NUMROW: Technology – Number of Rows
Define the number of rows within these DIMM’s
00 = 8,192
01 = 16,384
10 = 32,768
11 = 65,536
1:0
RWST
00
NUMCOL: Technology – Number of Columns
Define the number of columns within these DIMM’s
00 = 1,024
01 = 2,048
10 = 4,096
11 = 8,192
14.5.1.4
DRT: DRAM Timing Control
The DRAM Timing Control register is used to setup timing for MemBIST access to
DRAMs.
Device:
NodeID
Function: 3
Offset:
78h
Bit
Attr
Default
Description
31
RV
0
Reserved
30:29 RWST
00
TRAS: DRAM tRAS minimum required delay from active command to precharge
command. Delay cycles based on JEDEC DDRII spec 45 ns for DDRII 400/533/667.
Based on the latest JEDEC spec (JESD79-2, Sept 2003) for DDRII 800 MHz min
tRAS is not defined yet.
tRASMIN clocks delay:
00 => 18 for DDRII 800 MHz
01 => 15 for DDRII 667 MHz
10 => 12 for DDRII 533 MHz
11 => Reserved
28:27 RWST
00
TRTP: DRAM cell internal read to precharge command delay.
tRTP clocks delay:
00 => 2
01 => 3
10 => 4
11 => 5
Intel® 6400/6402 Advanced Memory Buffer Datasheet
187
Registers
Device:
NodeID
Function: 3
Offset:
Bit
78h
Attr
Default
Description
26:24 RWST
000
BBRW: Back to Back Read-Write turn around.
This field determines the minimum number of CMDCLK between Read-Write
commands. The purpose of these 3 bits are to control the turnaround time on the
DQ bus.
Regular setting will be based on BL/2 + 2 tCK.
BL4: tR2W = 4 tCK
BL8: tR2W = 6 tCK
Command clocks apart based on the following encoding:
000 => 10
001 => 9
010 => 8
011 => 7
100 => 6
101 => 5
110 => 4
111 => 3 (stress mode, not recommended)
23
RV
0
Reserved
22:20 RWST
000
BBWR: Back to Back Write-Read turn around.
This field determines the minimum number of CMDCLK between Write-Read
commands. The purpose of these 3 bits are to control the turnaround time on the
DQ bus.
Regular setting will be based on (CL-1)+BL/2+tWTR.
Command clocks apart based on the following encoding:
000 => 12
001 => 11
010 => 10
011 => 9
100 => 8
101 => 7
110 => 6
111 => 5 (stress mode, not recommended
19
RV
0
Reserved
18:16 RWST
000
TWR: Twr DRAM Write Recovery delay
Overall delay clocks will be (CL+AL-1) +BL/2 + tWR from write command to
precharge command.
000 => 9
001 => 8
010 => 7
011 => 6
100 => 5
101 => 4
110 => 3
111 => 2
188
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 3
Offset:
Bit
78h
Attr
Default
Description
15:12 RWST
0000
TRC: Trc DRAM activate to another activate delay
0000 => 26
0001 => 25
0010 => 24
0011 => 23
0100 => 22
0101 => 21
0110 => 20
0111 => 19
1000 => 18
1001 => 17
1010 => 16
1011 => 15
1100 => 14
1101 => 13
1110 => 12
1111 => 11
11:10 RWST
00
TRCD: Trcd DRAM RAS# to CAS# delay
00 => 6
01 => 5
10 => 4
11 => 3
If AL >= Trcd, Read/Write command will be issued right after ACT cycle.
9:8
7:0
RWST
RWST
00
TRP: Trp DRAM RAS# to Precharge delay
00 => 6
01 => 5
10 => 4
11 => 3
00h
NOPCNT: Programmable NOP insertion (Device Deselect actually).
Number of Nops will be inserted between read/write commands to slow down
Membist activities in the same page.
Up to 255 clocks NOPs can be programmed to insert delay between read/write
commands. If NOPs delay is programmable less than the required DRAM timing,
Overall NOP delay from command to command will not be seen.
14.5.1.5
DRC: DRAM Controller Mode Register
This register controls the mode of the DRAM Controller.
Device:
NodeID
Function: 3
Offset:
Bit
7Ch
Attr
Default
Description
31:30
29
RV
00
0
Reserved
RW
INITDONE: Initialization Complete. This scratch bit communicates software
state from the AMB to BIOS. BIOS sets this bit to 1 after initialization of the DRAM
memory array is complete. This bit has no effect on AMB operation.
28
RV
0
Reserved
Intel® 6400/6402 Advanced Memory Buffer Datasheet
189
Registers
Device:
NodeID
Function: 3
Offset:
Bit
7Ch
Attr
Default
Description
CLKDIS: clock[3:0] output disable
27:24 RWST
0
0
23
RWST
SEQADDR: When set to 1 turns off address balancing on address bit A0 to support
DRAMs programmed for Sequential Burst Type
22
RWST
0
DQSHALFGAIN: - select for DQS differential amplifier gain. When set to 0
the amplifier gain is cut half to support differential strobes for DDR2
Note: the sense of this field is inverted from past DDR designs so that BIOS
supporting generic AMBs do not have to write a “1” to what is a “reserved”
field on other AMBs
21
RW
0
TESTMODE: When set to 1 the LEGSEL output of the DDR comp block selects one
of eight driver legs to enable. This bit can be used in conjunction with the
DRAMISCTL.DRVOVR bits to override the LEGSEL output generated by the comp
block.
20
19
RWST
RWST
0
0
RWPRDIS: Read/Write pointer reset disable
Disables the resetting of DDR cluster FIFO read and write pointers during normal
operation that occurs when a READ command finishes executing and no additional
READ commands are in process.
18
17
RWST
RWST
1
0
ODTZ: On-Die Termination Strength.
“0”
“1”
Disabled
Enabled
HLDDIS: command/address hold disable
Disabling hold will allow the address and bank address pins to revert to all zeros (all
ones on the balanced address copy) during idle cycles. When hlddis is clear, the
addresses retain the value of the last non-idle command cycle in order to reduce
switching on the bus.
16
15
14
13
12
RWST
RW
0
0
0
0
1
BALDIS: command/address balancing disable
CADIS: command/address output disable
CSDIS: chip select output disable
ODTDIS: ODT output disable
RW
RW
RWST
CKEFRCLOW: CKE Force Low
Forces CKE low. Must be cleared to enable normal DDR functionality. This bit
overrides the CKE1 and CKE0 fields described below, and also overrides all channel
commands and other hardware functions that would otherwise affect the state of
the CKE outputs.
11
10
RW
0
0
CKEDIS: CKE output disable
RWST
CKE1: CKE output 1 control and status. Software can write to this bit to change the
state of the CKE 1 output. Hardware will update this bit with the current status of
the CKE1 output two core cycles after a channel command or other hardware
function changes the state of the CKE1 output.
‘1’ = CKE1 pads asserted.
‘0’ = CKE1 pads de-asserted.
9
RWST
0
CKE0: CKE output 0 control and status. Software can write to this bit to change the
state of the CKE 0 output. Hardware will update this bit with the current status of
the CKE 0 output two core cycles after a channel command or other hardware
function changes the state of the CKE 0 output.
‘1’ = CKE0 pads asserted.
‘0’ = CKE0 pads de-asserted.
8
RWST
RWST
0
BL: DRAM burst length.
‘1’ = bl8
‘0’ = bl4
7:4
2h
AL: DRAM Additive Latency [3:0]
Note: This AL value is sampled during TS2 training sequences to set timing for FBD
link data returns. Changes to AL after this time will not effect FBD link data return
timing until the next TS2 sequence following link reset.
190
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 3
Offset:
7Ch
Bit
Attr
Default
Description
3:0
RWST
3h
CL: DRAM CAS Latency [3:0]
Note: This CL value is sampled during TS2 training sequences to set timing for FBD
link data returns. Changes to CL after this time will not effect FBD link data return
timing until the next TS2 sequence following link reset.
14.5.2
Memory BIST Registers
14.5.2.1
MBCSR: MemBIST Control
Architected MemBIST control interface.
Device:
NodeID
Function: 3
Offset:
40h
Bit
Attr
Default
Description
31
RWS
0
START: Start operation:
1 => Set this bit to begin MemBIST execution.
0 => Hardware will clear this bit when MemBIST execution is completed.
30
29
RW
RW
0
0
PF: Fail/Pass indicator:
Write to 0 when start MemBIST. Hardware will set to 1 when a failure is detected.
0 => Pass
1 => Fail
HALT: Halt on Error
0 => Operation will not halt due to a detected error.
1 => Operation will halt after read-compare data error is detected.
MemBIST will complete the current transaction before halting. This may result in
multiple errors being logged.
28
RW
0
ABORT: MemBIST test abort. When test abort bit is set, MBCSR bit 31 (Start
operation, RWS) needs to be set to "0" at the same time to avoid restarting
MemBIST.
0 => Normal operation.
1 => Need to abort the test during MemBIST operation.
If there is any following membist test after the abort test, bit [28] needs to be
cleared.
The Write to set MBCSR.abort must occur at least tRFC after the Write to set
MBCSR.start. Otherwise subsequent MemBIST operations may fail.
tRFC value is set in DAREFTC.trfc (Function3, offset70h, bit field 23:16).
27
RW
0
SPARE:
Intel® 6400/6402 Advanced Memory Buffer Datasheet
191
Registers
Device:
NodeID
Function: 3
Offset:
40h
Bit
Attr
Default
Description
ALGO: Embedded Algorithm selection:
Embedded Algorithm selection:
26:24
RW
000
000 => No embedded algorithm is selected. Normal command will be executed
from the selection of MBCSR bits field [5:4]
001 => Scan: ^ (WD1); ^(RD2); ^ (WI3); ^ (RI4)
010 => Undefined
011 => Data Retention Write or Init: ^ (WD1);
100 => Data Retention Read : ^ (RD2);
101 => Mats +: ^(WD1); ^(RD2, WI3); v(RI4, WD5);
110 => March C-: ^(WD1); ^(RD2, WI3); ^(RI4, WD5);
v(RD6, WI7); v(RI8, WD9); v(RD10);
111 => Undefined
Reserved
23:22
21:20
RV
00
00
RW
CS: CS[1:0] selection in MemBIST mode
01: select Rank 0
10: select Rank 1
00: Reserved
11: Reserved
19
RW
RW
0
INVERT: Invert data pattern when data is written out to DRAM.
18:16
000
FIXED: Fixed data pattern selection for MemBIST operation
000 => 0
001 => F
010 => A
011 => 5
100 => C
101 => 3
110 => 9
111 => 6
15
RW
0
ENABLE288: Enable 288 bits user defined pattern for memory fill write only.
There is no data comparison, error logger functions for 288 bits user defined
data.
0 => 144 bits user defined data pattern when MBCSR[9:8] selects user defined
data.
1 => 288 bits user defined data pattern when MBCSR[9:8] selects user defined
data.
14
13
RW
RW
0
0
MBDATA: Selects use of MBDATA for error log field for LFSR, Circular Shift and
user defined data modes. This field has no effect on fixed data patterns.
0 => use MBDATA0/1/2/3/8 for failure data bit location accumulator.
1 => use MBDATA0/1/2/3/8 to log 5 failure addresses.
ABAR: MemBIST output address compliment for FastX, FastY, and FastXY.
Whenever this bit is enabled, Bank, Row, Column address will be inverted on
alternate addresses as described in the MemBIST chapter.
0 => Regular addressing
1 => Dynamic address inversion
12
RW
0
ADIR: Address decode direction for FastX, Fast Y, FastXY
0 => Address increments
1 => Address decrements
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 3
Offset:
40h
Bit
Attr
Default
Description
11:10
RW
00
FAST: Address sequencing
00 => addressing with XZY toggling (column->bank->row)
01 => Fast Y with fixed bank
10 => Fast X with fixed bank
11 => Fast XY with fixed bank
9:8
RW
00
DTYPE: Data type selection:
00 => Fixed data pattern, selected by MBCSR bits 18:16
01 => 144 or 288 bits user defined data
10 => Circular shift data
11 => LFSR data, seeded from 32 bit LFSR seed register.
Note: Algorithm mode only supports DTYPE = Fixed
Note: Circular shift data and LFSR data type should not be used for single address
operation (ATYPE = 01).
7:6
RW
00
ATYPE: Address type
00 => Reserved
01 => Single physical address operation, contained in MBADDR row/column/
bank.
10 => start/end physical address range defined in MB_START_ADDR &
MB_END_ADDR registers.
•
In FastX, FastY and FastXY modes, only the bank specified in
MB_START_ADDR will be exercised.
11 => full address range of the DIMM as defined in MTR register which specifies
the number of banks, rows, and columns.
•
In FastX, FastY and FastXY modes, only the bank 0 will be exercised.
5:4
3:0
RW
RV
00
0
CMD: Command execution:
00 => Read only without data comparison
01 => Write only
10 => Read with data comparison
11 => Write followed by Read with data comparison
Reserved
Algorithms:
When Embedded algorithm is applied, please program the following bits at the same
time.
1. Select MBCSR.cmd bit[5:4] for the initial command execution mode.
For all algorithm choices except for Data Retention Read, select "01: write only".
For Data Retention Read, select "10: read with data comparison".
2. Program MBCSR.fast bit[11:10] to select FastX, FastY, FastXY, or XZY.
3. Program proper start/end address registers and corresponding MTR value for DIMM
type. Do not leave start and end address register as default "00" or the same
value. Algorithm does not support single or full address modes.
14.5.2.2
MBADDR: Memory Test Address
The register is used by MemBIST only when testing to a single memory location.
(MBCSR.atype = 2b‘01)
Intel® 6400/6402 Advanced Memory Buffer Datasheet
193
Registers
Device:
NodeID
Function: 3
Offset:
Bit
44h
Attr
Default
Description
31:16 RWST
0000h ROW: Row Address 15:0
15
RWST
RWST
0
SPARE:
14:3
0000h COL: Column Address
BL8[14:3] <==> DRAM Column Address 15:11,9:3
BL4[14:3] <==> DRAM Column Address 14:11,9:2
2:0
RWST
000
BA: Bank Address 2:0
14.5.2.3
MBDATA[9:0]: Memory Test Data
Device:
NodeID
Function: 3
Offset:
6Ch, 68h, 64h, 60h,5Ch, 58h, 54h, 50h,4Ch, 48h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: see functional description below for definition by mode and register
Description by mode
(note: MBCSR.dtype, MBCSR.mbdata and MBCSR.enable288 select mode)
Reg
Bit Offset
Fixed Data
Pattern
144 bit User
Defined Pattern
288 bit User
defined pattern
Circular Shift
LFSR
5th Fail address
User defined Late Word4 Circular
LFSR random Late User defined Late
data [71:64] & data [71:64] (2nd
Early data [71:64] burst data) &
Early data [71:64]
data [71:64] &
shift data
Early data [71:64]
MBDATA9 31:0 6Ch
MBDATA8 31:0 68h
(2nd burst data)
Late data [71:64] 5th Fail address
5th Fail address
Or
5th Fail address
Or
User defined Late
data [71:64] (1st
& Early data
[71:64] Failure bit
location
Or
burst data)
&
Late data [71:64] Late data [71:64] Late data [71:64]
& Early data & Early data & Early data
[71:64] Failure bit [71:64] Failure bit [71:64] Failure bit
Early data [71:64]
(1st burst data)
accumulator
location
accumulator
location
accumulator
location
accumulator
Fail address 4
Fail address 3
Fail address 2
Fail address 1
User defined Late DW3 Circular shift LFSR random Late User defined Late
data [63:32]
data
data [63:32]
data [63:32]
(2nd burst data)
MBDATA7 31:0 64h
MBDATA6 31:0 60h
MBDATA5 31:0 5Ch
MBDATA4 31:0 58h
User defined Late DW2 Circular shift LFSR random Late User defined Late
data [31:0]
data
data [31:0]
data [31:0]
(2nd burst data)
User defined Early DW1 Circular shift LFSR random
data [63:32] data
User defined Early
Early data [63:32] data [63:32]
(2nd burst data)
User defined Early DW0 Circular shift LFSR random
User defined Early
data [31:0]
(2nd burst data)
data [31:0]
data
Early data [31:0]
Late data [63:32] Fail address 4
Fail address 4
Or
Fail address 4
Or
User defined Late
data [63:32]
(1st burst data)
Failure bit location
accumulator
Or
MBDATA3 31:0 54h
Late data [63:32] Late data [63:32] Late data [63:32]
Failure bit location Failure bit location Failure bit location
accumulator
accumulator
accumulator
194
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Description by mode
(note: MBCSR.dtype, MBCSR.mbdata and MBCSR.enable288 select mode)
Reg
Bit
Offset
Fixed Data
Pattern
144 bit User
Defined Pattern
288 bit User
defined pattern
Circular Shift
LFSR
Late data [31:0]
Failure bit location
accumulator
Fail address 3
Or
Late data [31:0]
Failure bit location Failure bit location Failure bit location
accumulator
Fail address 3
Or
Late data [31:0]
Fail address 3
Or
Late data [31:0]
User defined Late
data [31:0] (1st
burst data)
MBDATA2 31:0 50h
MBDATA1 31:0 4Ch
MBDATA0 31:0 48h
accumulator
accumulator
Early data [63:32] Fail address 2
Failure bit location
accumulator
Fail address 2
Or
Fail address 2
Or
User defined Early
data [63:32]
(1st burst data)
Or
Early data [63:32] Early data [63:32] Early data [63:32]
Failure bit location Failure bit location Failure bit location
accumulator
accumulator
accumulator
Early data [31:0]
Failure bit location
accumulator
Fail address 1
Or
Early data [31:0]
Fail address 1
Or
Early data [31:0]
Fail address 1
Or
Early data [31:0]
User defined Early
data [31:0]
(1st burst data)
Failure bit location Failure bit location Failure bit location
accumulator accumulator accumulator
Note: In the later half part of data burst length 8 test, 144 bits or 288 bits user-defined data pattern will be repeat as the same
sequence of burst length 4.
14.5.2.3.1
MBDATA Failure Address Mapping
To compress the failure address into 32 bits, bits that are always zero are removed
from the logging. These removed bits include AutoPrecharge Column address [10] and
least significant bits assumed by burst length.
Table 14-11.MBDATA Failure Address Register Correspondence to DRAM Address
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10
0 15 14 13 12 11 10
9
8
7
6
5
4
3
2
1
0
2
1
9
8
7
6
5
4
3
2
1
0
see description below
Column and Chunk
Bank
Row
BL4: 1 bit chunk indicates the location of 2 failure burst data chunks.
The above Column plus Chunk is equal to DRAM column address as the following:
Table 14-12.BL4 Column and Chunk Correspondence to DRAM Address
1
2
1
1
1
0
Register Bit Location
9
8
9
7
8
6
7
5
6
4
5
3
4
2
3
1
2
0
1
4
1
3
1
2
1
1
DRAM Col Address
Data Chunk
1
X
• where the auto-precharge address bit 10 is assumed zero
• since data is logged in 144 bits (two chunks), address bit zero is not needed
BL8: 2 bit chunk indicates the location of 4 failure burst data chunks.
The above Column plus Chunk is equal to DRAM column address as the following:
Intel® 6400/6402 Advanced Memory Buffer Datasheet
195
Registers
Table 14-13.BL8 Column and Chunk Correspondence to DRAM Address
Register Bit Location
DRAM Col Address
Data Chunk
12 11 10
9
8
9
7
8
6
7
5
6
4
5
3
4
2
3
1
0
1
14 13 12 11
2
X
• where the auto-precharge address bit 10 is assumed zero
• since data is logged in 144 bits (two chunks), Data chunk address bit zero is not
needed
14.5.2.4
MB_START_ADDR: Memory Test Start Address
MB_END_ADDR row and column address must be larger than MB_START_ADDR row
and column address in either increasing or deceasing address mode.
During FastX, FastY and FastXY operation, only one memory bank is tested. Specify the
desired bank in MB_START_ADDR[2:0]. MB_END_ADDR[2:0] is ignored.
This register is only used when MBCSR.atype = 2b’10, and when MBCSR.algo is
non-zero.
Device:
NodeID
Function: 3
Offset:
Bit
9Ch
Attr
Default
Description
31:16 RWST
0000h ROW: MemBIST Start Row Address 15:0
Reserved
15
RV
0
14:3
RWST
0000h COL: MemBIST Start Column Address
BL8 [14:3] <==> Column Address 15:11, 9:3
BL4 [14:3] <==> Column Address 14:11, 9:2
2:0
RWST
000
BA: MemBIST Start Bank Address 2:0
14.5.2.5
MB_END_ADDR: Memory Test End Address
This register is only used when MBCSR.atype = 2b’10, and when MBCSR.algo is
non-zero.
Device:
NodeID
Function: 3
Offset:
Bit
A0h
Attr
Default
Description
31:16 RWST
0000h ROW: MemBIST End Row Address 15:0
Reserved
15
RV
0
14:3
RWST
0000h COL: MemBIST End Column Address
BL8 [14:3] <==> Column Address 15:11, 9:3
BL4 [14:3] <==> Column Address 14:11, 9:2
2:0
RWST
000
BA: MemBIST End Bank Address 2:0
196
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.5.2.6
MBLFSRSED: Memory Test Circular Shift and LFSR Seed
Device:
NodeID
Function: 3
Offset:
A4h
Bit
Attr
Default
Description
31:0
RWST
0000h DMBLFSRSED:MemBIST LFSR Seed
This 32 bit register will be used as the initial data seed for LFSR or Circular shift
data pattern.
14.5.2.7
MBFADDRPTR: Memory Test failure Address Pointer Register
Device:
NodeID
Function: 3
Offset:
A8h
Bit
Attr
Default
Description
31:0
RWST
0000h DMBFADDRPTR: This 32 bit register designates which MemBIST failures to log in
the available failure address locations.
The default value of this register is zero. It means MemBIST always logs beginning
with the first failure. If it is programmed to hex A (10 in decimal), MemBIST will log
failures starting from the11th failure.
The corresponding MB_ERR_DATA0 register will log corrupted data in the first
designated failure address.
Note: this register does not affect the MBDATA failure bit location accumulators.
14.5.2.8
MB_ERR_DATA00: Memory Test Error Data 0 Bytes [3:0]
Stores the first 32 bits of the 1st 144 bit failure data Research: compare all
register[definitions to table.]
Device:
NodeID
Function: 3
Offset:
B0h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [31:0]
14.5.2.9
MB_ERR_DATA01: Memory Test Error Data 0 Bytes [7:4]
Stores the second 32 bits of the 1st 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
B4h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [63:32]
Intel® 6400/6402 Advanced Memory Buffer Datasheet
197
Registers
14.5.2.10 MB_ERR_DATA02: Memory Test Error Data 0 Bytes [11:8]
Stores the third 32 bits of the 1st 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
B8h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [31:0]
14.5.2.11 MB_ERR_DATA03: Memory Test Error Data 0 Bytes [15:12]
Stores the fourth 32 bits of the 1st 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
BCh
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [63:32]
14.5.2.12 MB_ERR_DATA04: Memory Test Error Data 0 Bytes [17:16]
Stores the last 16 bits of the 1st 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
C0h
Bit
Attr
Default
Description
15:0
RWST
0000h DATA: Late failure data [71:64] & Early failure data [71:64]
14.5.2.13 MB_ERR_DATA10: Memory Test Error Data 1 Bytes [3:0]
Stores the first 32 bits of the 2nd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
C4h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [31:0]
14.5.2.14 MB_ERR_DATA11: Memory Test Error Data 1 Bytes [7:4]
Stores the second 32 bits of the 2nd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
C8h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [63:32]
198
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.5.2.15 MB_ERR_DATA12: Memory Test Error Data 1 Bytes [11:8]
Stores the third 32 bits of the 2nd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
CCh
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [31:0]
14.5.2.16 MB_ERR_DATA13: Memory Test Error Data 1 Bytes [15:12]
Stores the fourth 32 bits of the 2nd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
D0h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [63:32]
14.5.2.17 MB_ERR_DATA14: Memory Test Error Data 1 Bytes [17:16]
Stores the last 16 bits of the 2nd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
D4h
Bit
Attr
Default
Description
15:0
RWST
0000h DATA: Late failure data [71:64] & Early failure data [71:64]
14.5.2.18 MB_ERR_DATA20: Memory Test Error Data 2 Bytes [3:0]
Stores the first 32 bits of the 3rd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
D8h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [31:0]
14.5.2.19 MB_ERR_DATA21: Memory Test Error Data 2 Bytes [7:4]
Stores the second 32 bits of the 3rd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
DCh
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [63:32]
Intel® 6400/6402 Advanced Memory Buffer Datasheet
199
Registers
14.5.2.20 MB_ERR_DATA22: Memory Test Error Data 2 Bytes [11:8]
Stores the third 32 bits of the 3rd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
E0h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [31:0]
14.5.2.21 MB_ERR_DATA23: Memory Test Error Data 2 Bytes [15:12]
Stores the fourth 32 bits of the 3rd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
E4h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [63:32]
14.5.2.22 MB_ERR_DATA24: Memory Test Error Data 2 Bytes [17:16]
Stores the last 16 bits of the 3rd 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
E8h
Bit
Attr
Default
Description
15:0
RWST
0000h DATA: Late failure data [71:64] & Early failure data [71:64]
14.5.2.23 MB_ERR_DATA30: Memory Test Error Data 3 Bytes [3:0]
Stores the first 32 bits of the 4th 144 bit failure data.
14.5.2.24 MB_ERR_DATA31: Memory Test Error Data 3 Bytes [7:4]
Stores the second 32 bits of the 4th 144 bit failure data
Device:
NodeID
Function: 3
Offset:
F0h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Early failure data [63:32]
14.5.2.25 MB_ERR_DATA32: Memory Test Error Data 3 Bytes [11:8]
Stores the third 32 bits of the 4th 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
F4h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [31:0]
200
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.5.2.26 MB_ERR_DATA33: Memory Test Error Data 3 Bytes [15:12]
Stores the fourth 32 bits of the 4th 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
F8h
Bit
Attr
Default
Description
31:0
RWST
0000h DATA: Late failure data [63:32]
14.5.2.27 MB_ERR_DATA34: Memory Test Error Data 3 Bytes [17:16]
Stores the last 16 bits of the 4th 144 bit failure data.
Device:
NodeID
Function: 3
Offset:
FCh
Bit
Attr
Default
Description
15:0
RWST
0000h DATA: Late failure data [71:64] & Early failure data [71:64]
14.5.3
Thermal Sensor Registers
14.5.3.1
TEMPLO: Temperature Low Trip Point
Low trip point.
Device:
NodeID
Function: 3
Offset:
80h
Bit
Attr
Default
Description
Description
Description
7:0
RWST
FFh
TEMPLO: Low threshold trip point
14.5.3.2
TEMPMID: Temperature Mid Trip Point
Mid trip point.
Device:
Function: 3
Offset:
NodeID
81h
Bit
Attr
Default
7:0
RWST
FFh
TEMPMID: Mid threshold trip point
14.5.3.3
TEMPHI: Temperature High Trip Point
High trip point.
Device:
Function: 3
Offset:
NodeID
82h
Bit
Attr
Default
7:0
RWST
FFh
TEMPHI: High threshold trip point
Intel® 6400/6402 Advanced Memory Buffer Datasheet
201
Registers
14.5.3.4
UPDATED: Update Temp Diff Bit
Take new temperature sample and update the temp diff bit (INCREASING).
Device:
NodeID
Function: 3
Offset:
Bit
83h
Attr
Default
Description
7:1
RV
00h
reserved
0
RWS
0
UPDATE:
Write ‘1’ =
a. latch current temperature from the TEMP register for comparison
on next UPDATE and
b. update INCREASING bit of TEMPSTAT register based on the current
temperature and the last latched temperature;
c. Automatically clears this bit to ‘0’ after INCREASING bit is updated;
Write ‘0’ - no effect
14.5.3.5
TEMPSTAT: Thermal Sensor Status Register
This register controls and reports temperature status.
Device:
NodeID
Function: 3
Offset:
Bit
84h
Attr
Default
Description
7:6
5
RV
0
0
Reserved
RWST
NoAutoUpdate
‘1’ = turns off update of temp stat values so that forced values written in
by firmware are not overwritten
‘0’ = overtemp trip bits are continuously and automatically updated as
normal and increasing bit is updated through UPDATE register mechanism
4
RW
0
INCREASING
‘1’ = Temperature has increased since the last time UPDATE bit was set in
UPDATED register.
‘0’ = Temperature has not increased since the last time UPDATE bit was set
in UPDATED register.
This is reflected as the Rising/Falling value in the Thermal Trip field of
northbound FBD status 0.
3
2
RWST
RWST
0
0
OVERTEMPHI
‘1’ = Temperature is above or equal to TEMPHI.TRIP
‘0’ = Temperature is below TEMPHI.TRIP
OVERTEMPMID
‘1’ = Temperature is above or equal to TEMPMID.TRIP
‘0’ = Temperature is below TEMPMID.TRIP
This is reflected in the Thermal Trip value of northbound FBD status 0
1
0
RWST
RWST
0
0
OVERTEMPLO
‘1’ = Temperature is above or equal to TEMPLO.TRIP
‘0’ = Temperature is below TEMPLO.TRIP
This is reflected in the Thermal Trip value of northbound FBD status 0
TEMPHIENABLE
‘1’ = Allow OVERTEMPHI=1 to shut down the DDR channel, drop DDR
commands, log an error, and take FBD links to EI.
‘0’ = OVERTEMPHI=1 only logs an error.
202
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.5.3.6
TEMP: Temperature A/D
Current temperature reading. This 8-bit value with 0.5 degree of resolution is
continuously and automatically kept up to date by AMB hardware.
Device:
NodeID
Function: 3
Offset:
85h
Bit
Attr
Default
Description
7:0
RO
00h
DEGREES: Current temperature - binary encode 0 - 127.5 degrees C
14.6
Implementation Specific DDR Initialization and
Calibration Registers (Function 4)
14.6.1
DDR Calibration
14.6.1.1
DCALCSR: DCAL Control and Status
Device:
NodeID
Function: 4
Offset:
40h
Bit
Attr
Default
Description
31
RWS
0
START: Start Operation
When set to 1 by software, the operation selected by the dcalcsr.opcode is
initiated. Hardware clears this bit when the operation is complete.
30:28
27
RW
RW
0
0
FAIL: Completion Status
1xx = Fail, 0xx = Pass
BASPAT: This controls which data pattern is used for the DQS Delay
calibration. Setting this field enables the use of the basic data pattern
selected by the DCALCSR.PATTERN bits. When cleared, the extended data
pattern specified in the DDQSCVDP and DDQSCADP registers is used.
26
RW
00
RSTREGSS: Reset DCALDATA CSR in single step calibration mode. This bit
should be set during the first step of a single step calibration. It will enable
hardware to clear all registers and status bits during the calibration step
the same way hardware does on the first step of an automatic “all passes”
calibration.
25:24
23
RW
RW
0
0
CHSEL: This field defines bus folding. This function is obsolete and is not
supported.
SGLSTP: Single Step Calibration Operation
Applies only to Receive enable, DQS cal, and I/O loopback
“1” = Single step - a single step of the algorithm selected by the OPCODE
is run by hardware. No data analysis is run.
“0” = All passes - all steps of the algorithm selected by the OPCODE is run
by hardware including data analysis.
22:21
RW
00
CS: Rank select
This field corresponds to the chip select outputs: CS[1:0]. Setting a bit in
this field will cause the corresponding CS pin to drive low when commands
are issued on the DDR bus. This field Applies to NOP, Refresh, Precharge
all, and MRS/EMRS commands. It also applies to Receive Enable, and DQS
Delay cal in single step mode.
20
19
RV
0
0
Reserved
RW
A0_DQSCAL: revert to A0 DQSCAL algorithm
Intel® 6400/6402 Advanced Memory Buffer Datasheet
203
Registers
Device:
NodeID
Function: 4
Offset:
40h
Bit
Attr
Default
Description
18:16
RW
000
PATTERN: Basic data pattern for DQS cal and I/O loopback. This sets the
burst length 4 pattern for a nibble of data. The pattern is repeated for BL8.
This pattern is replicated on all nibbles of the data bus.
“000” = F > 0 > F > 0
“001” = 0 > F > 0 > F
“010” = A > 5 > A > 5
“011” = 5 > A > 5 > A
“100” = C > 3 > C > 3
“101” = 3 > C > 3 > C
“110” = 9 > 6 > 9 > 6
“111” = 6 > 9 > 6 > 9
15
RW
0
DARWPR: Disable FIFO reset in single pass mode.
Applies only to Receiver enable, DQS cal, and I/O loopback.
When set to 1, this bit inhibits the core to DDR cluster reset signal
generated during the cal/hvm modes listed above. This prevents the DDR
cluster synchronizer FIFO write pointer and data latches from being reset
so that they can be read out of the cluster using the error monitor function.
The reset signal can only be disabled in single step mode. When the ALLP
bit is set to 1, the DARWPR bit has no effect.
14:4
3:0
RW
RW
000h
0h
OPMODS: Operation modifiers
OPCODE:
“0000” = NOP
“0001” = Refresh
“0010” = Pre-Charge
“0011” = MRS/EMRS
“0101” = Automatic DQS Delay Calibration
“1100” = Automatic Receive Enable Calibration
“1101” = Self-Refresh Entry
All other settings are reserved
14.6.1.2
DCALADDR: DCAL Address Register
Device:
NodeID
Function: 4
Offset:
44h
Bit
Attr
Default
Description
31:0
RW
0000_0000h DCALADDR: DCAL Address and Other Information Based on Opcode.
204
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-14.Functional Characteristics of DCALADDR
NOP, Refresh, Pre-Charge, MRS/EMRS,
and Self-Refresh Entry Commands
Bit
initiated by DCALCSR
DRAM Address Bus 15:0
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
DRAM Bank Address Bus 2:0
2
1
0
Intel® 6400/6402 Advanced Memory Buffer Datasheet
205
Registers
14.6.1.3
DCALDATA[71:0]: DCAL Data Registers
Device:
NodeID
Function: 4
Offset:
8Fh - 48h
Bit
Attr
Default
Description
DCALDATA: DCAL Data and Other Information Based on Opcode.
7:0
RW
00h
Table 14-15.Functional Characteristics of DCALDATA for Calibration Algorithms
(Sheet 1 of 2)
Byte
Receive Enable
DQS Cal
Max delay DQS17 rank1
71
70
69
68
67
66
65
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
Preamble status DQS17 rank1
First edge position DQS17 rank1
Preamble status DQS8 rank1
First edge position DQS8 rank1
Preamble status DQS16 rank1
First edge position DQS16 rank1
Preamble status DQS7 rank1
First edge position DQS7 rank1
Preamble status DQS15 rank1
First edge position DQS15 rank1
Preamble status DQS6 rank1
First edge position DQS6 rank1
Preamble status DQS14 rank1
First edge position DQS14 rank1
Preamble status DQS5 rank1
First edge position DQS5 rank1
Preamble status DQS13 rank1
First edge position DQS13 rank1
Preamble status DQS4 rank1
First edge position DQS4 rank1
Preamble status DQS12 rank1
First edge position DQS12 rank1
Preamble status DQS3 rank1
First edge position DQS3 rank1
Preamble status DQS11 rank1
First edge position DQS11 rank1
Preamble status DQS2 rank1
First edge position DQS2 rank1
Preamble status DQS10 rank1
First edge position DQS10 rank1
Preamble status DQS1 rank1
First edge position DQS1 rank1
Preamble status DQS9 rank1
Min delay DQS17 rank1
Max delay DQS8 rank1
Min delay DQS8 rank1
Max delay DQS16 rank1
Min delay DQS16 rank1
Max delay DQS7 rank1
Min delay DQS7 rank1
Max delay DQS15 rank1
Min delay DQS15 rank1
Max delay DQS6 rank1
Min delay DQS6 rank1
Max delay DQS14 rank1
Min delay DQS14 rank1
Max delay DQS5 rank1
Min delay DQS5 rank1
Max delay DQS13 rank1
Min delay DQS13 rank1
Max delay DQS4 rank1
Min delay DQS4 rank1
Max delay DQS12 rank1
Min delay DQS12 rank1
Max delay DQS3 rank1
Min delay DQS3 rank1
Max delay DQS11 rank1
Min delay DQS11 rank1
Max delay DQS2 rank1
Min delay DQS2 rank1
Max delay DQS10 rank1
Min delay DQS10 rank1
Max delay DQS1 rank1
Min delay DQS1 rank1
Max delay DQS9 rank1
206
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-15.Functional Characteristics of DCALDATA for Calibration Algorithms
(Sheet 2 of 2)
Byte
Receive Enable
DQS Cal
Min delay DQS9 rank1
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
First edge position DQS9 rank1
Preamble status DQS0 rank1
First edge position DQS0 rank1
Preamble status DQS17 rank0
First edge position DQS17 rank0
Preamble status DQS8 rank0
First edge position DQS8 rank0
Preamble status DQS16 rank0
First edge position DQS16 rank0
Preamble status DQS7 rank0
First edge position DQS7 rank0
Preamble status DQS15 rank0
First edge position DQS15 rank0
Preamble status DQS6 rank0
First edge position DQS6 rank0
Preamble status DQS14 rank0
First edge position DQS14 rank0
Preamble status DQS5 rank0
First edge position DQS5 rank0
Preamble status DQS13 rank0
First edge position DQS13 rank0
Preamble status DQS4 rank0
First edge position DQS4 rank0
Preamble status DQS12 rank0
First edge position DQS12 rank0
Preamble status DQS3 rank0
First edge position DQS3 rank0
Preamble status DQS11 rank0
First edge position DQS11 rank0
Preamble status DQS2 rank0
First edge position DQS2 rank0
Preamble status DQS10 rank0
First edge position DQS10 rank0
Preamble status DQS1 rank0
First edge position DQS1 rank0
Preamble status DQS9 rank0
First edge position DQS9 rank0
Preamble status DQS0 rank0
First edge position DQS0 rank0
Max delay DQS0 rank1
Min delay DQS0 rank1
Max delay DQS17 rank0
Min delay DQS17 rank0
Max delay DQS8 rank0
Min delay DQS8 rank0
Max delay DQS16 rank0
Min delay DQS16 rank0
Max delay DQS7 rank0
Min delay DQS7 rank0
Max delay DQS15 rank0
Min delay DQS15 rank0
Max delay DQS6 rank0
Min delay DQS6 rank0
Max delay DQS14 rank0
Min delay DQS14 rank0
Max delay DQS5 rank0
Min delay DQS5 rank0
Max delay DQS13 rank0
Min delay DQS13 rank0
Max delay DQS4 rank0
Min delay DQS4 rank0
Max delay DQS12 rank0
Min delay DQS12 rank0
Max delay DQS3 rank0
Min delay DQS3 rank0
Max delay DQS11 rank0
Min delay DQS11 rank0
Max delay DQS2 rank0
Min delay DQS2 rank0
Max delay DQS10 rank0
Min delay DQS10 rank0
Max delay DQS1 rank0
Min delay DQS1 rank0
Max delay DQS9 rank0
Min delay DQS9 rank0
Max delay DQS0 rank0
Min delay DQS0 rank0
8
7
6
5
4
3
2
1
0
Intel® 6400/6402 Advanced Memory Buffer Datasheet
207
Registers
DCALDATA Receiver Enable “First edge position” byte detail
Description
Bit
7:0
At the end of a successful calibration, this register holds the DRRTC setting that enables the DQS
receiver as close as possible to but no earlier than the first rising DQS transition after the preamble. At
the start of the calibration, this register is loaded with a value of 0xFF. During the calibration, while
the “strobe toggle status” bit is low, this register will be updated with the DRRTC value for the current
calibration step if the DQS is found to have a value of zero. After “strobe toggle status” goes high, this
register will be updated with the DRRTC value when the DQS is found to have a value of one at a
calibration step. This register will no longer be updated after the “preamble found status” bit
goes high, so that it will retain the position of the rising DQS edge following immediately after
the preamble.
DCALDATA Receiver Enable “Preamble status” byte detail
Description
Bit
7
Strobe toggle status. Hardware sets this bit if a valid high pulse is found in the strobe waveform. The
requirement is (DCALDATA.First_edge_position - last receiver enable delay value) >
RCVENAC.HWIDTH
6
5
Preamble found status. Hardware sets this bit if the “preamble found” bit asserts at any time during
the calibration.
Preamble found. Last receiver enable delay value meets or exceeds the preamble width requirement
setting.
Hardware sets this bit if: (DCALDATA.First_edge_position - last receiver enable delay value) >
RCVENAC.PWIDTH
4:0
Count of “lows” minus count of “highs” found during one set of repeated tests at the last receiver
enable delay setting. See DCALCSR opmods field for a description of the repeat test function.
DCALDATA DQS Cal Max Delay detail
Bit
Description
7:6
5:0
reserved
At the end of a successful calibration, this field will hold the maximum DQS delay setting that results
in correct data capture in the DDR I/O capture flop. This is the right edge of the DQ data eye. During
the calibration, this field is updated with the DQS delay setting at each calibration step until the
minimum delay setting is found and a subsequent failure to capture correct read data occurs.
Table 14-16.Functional Characteristics of DCALDATA for HVM Algorithms
Byte
I/O Loopback
DLL BIST
71:3
6
Not used
Not used
35
34
33
32
31
30
First “All Bits Failed” position and Status DQS17
First “Any Bit Failed” Position and Status DQS17
First “All Bits Failed” position and Status DQS8
First “Any Bit Failed” Position and Status DQS8
First “All Bits Failed” position and Status DQS16
First “Any Bit Failed” Position and Status DQS16
Core Counter DQS17
Core Counter DQS8
Core Counter DQS16
208
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Table 14-16.Functional Characteristics of DCALDATA for HVM Algorithms
Byte
I/O Loopback
DLL BIST
Core Counter DQS7
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
First “All Bits Failed” position and Status DQS7
First “Any Bit Failed” Position and Status DQS7
First “All Bits Failed” position and Status DQS15
First “Any Bit Failed” Position and Status DQS15
First “All Bits Failed” position and Status DQS6
First “Any Bit Failed” Position and Status DQS6
First “All Bits Failed” position and Status DQS14
First “Any Bit Failed” Position and Status DQS14
First “All Bits Failed” position and Status DQS5
First “Any Bit Failed” Position and Status DQS5
First “All Bits Failed” position and Status DQS13
First “Any Bit Failed” Position and Status DQS13
First “All Bits Failed” position and Status DQS4
First “Any Bit Failed” Position and Status DQS4
First “All Bits Failed” position and Status DQS12
First “Any Bit Failed” Position and Status DQS12
First “All Bits Failed” position and Status DQS3
First “Any Bit Failed” Position and Status DQS3
First “All Bits Failed” position and Status DQS11
First “Any Bit Failed” Position and Status DQS11
First “All Bits Failed” position and Status DQS2
First “Any Bit Failed” Position and Status DQS2
First “All Bits Failed” position and Status DQS10
First “Any Bit Failed” Position and Status DQS10
First “All Bits Failed” position and Status DQS1
First “Any Bit Failed” Position and Status DQS1
First “All Bits Failed” position and Status DQS9
First “Any Bit Failed” Position and Status DQS9
First “All Bits Failed” position and Status DQS0
First “Any Bit Failed” Position and Status DQS0
Core Counter DQS15
Core Counter DQS6
Core Counter DQS14
Core Counter DQS5
Core Counter DQS13
Core Counter DQS4
Core Counter DQS12
Core Counter DQS3
Core Counter DQS11
Core Counter DQS2
Core Counter DQS10
Core Counter DQS1
Core Counter DQ9
Core Counter DQS0
8
7
6
5
4
3
2
1
0
DCALDATA I/O Loopback “Any Bit Failed” detail
Bit
Description
7
First “First Any bit Failed” Nibble. This bit is set if the nibble associated with this register is one of the
first to fail to capture data correctly during the test.
6
reserved
5:0
At the end of the test, this field will contain the minimum DQS delay setting that results in one or
more bits of a burst to be captured incorrectly.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
209
Registers
DCALDATA I/O Loopback “All Bits Failed” detail
Description
Bit
7
Last “First All Bits Failed” Nibble. This bit is set if the nibble associated with this register is one of the
last to capture an entire data burst incorrectly during the test.
6
reserved
5:0
At the end of the test, this field will contain the minimum DQS delay setting that results all bits of a
burst to be captured incorrectly.
DCALDATA DLL BIST Core Counter detail
Description
Bit
15:0 At the end of the test this two byte register will contain the number of core cycles counted from the
time the associated DLL delay line outputs a “terminal count” number of self-oscillation cycles. The
terminal count is defined by the DDBISTLM.TCOUNT register.
14.6.1.4
DDBISTLM: DDR DLL BIST Limits
This register contains test limits for DDR DLL BIST.
Device:
NodeID
Function: 4
Offset:
Bit
90h
Attr
Default
Description
23:16
15:0
RWST
RWST
0Fh
TCOUNT: DLL delay line output terminal count
CVAR: core count variation limit
000Fh
14.6.1.5
RCVENAC: Receiver Enable Algorithm Control
This register contains controls for the preamble detection algorithm of the automatic
receiver enable logic. RCVENAC.PWIDTH is used to determine if a “low” pulse in a DQS
waveform is wide enough to be a preamble. RCVENAC.POFFSET is subtracted from the
DCALDATA first edge position result and programmed into the DRRTC registers.
Device:
NodeID
Function: 4
Offset:
94h
Bit
Attr
Default
Description
23:16
RWST
18h
PWIDTH: Minimum preamble width limit, used to detect if a low
pulse in a DQS waveform is wide enough to be a valid preamble. The
default corresponds to 3/4 of a DRAM clock cycle
15:14
13:8
RV
0h
Reserved
RWST
08h
HWIDTH: Minimum high pulse width limit, used to detect if a high
pulse in a DQS waveform is wide enough to indicate a strobe is
toggling in a valid manner. The default corresponds to 1/4 of a DRAM
clock cycle.
7:6
5:0
RV
0h
Reserved
RWST
10h
POFFSET: Preamble center offset from first rising edge, used to
position the DQS receiver enable relative to the preamble edge
location recorded in the DCALDATA registers. The default value
corresponds to 1/2 of a DRAM clock cycle.
210
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.6.1.6
DSRETC: DRAM Self-Refresh Extended Timing and Control
This register sets the timing of operations to different ranks while the auto-refresh FSM
controls the DRAM command bus. This allows power intensive commands to be
staggered. This register also contains the count for the auto-refresh FSM handshake
time out. The FSM will wait a maximum of the time out count before taking control of
the bus and issuing the command sequence to put the DRAMs into self-refresh. The
RSTREQERR bit of the DSREFTC CSR will be set if the time out count is reached.
Device:
NodeID
Function: 4
Offset:
Bit
98h
Attr
Default
Description
31:24
23:16
RV
0h
Reserved
RWST
14h
DRSRENT: dual rank self-refresh entry timing - stagger of commands
between ranks
15:8
7:0
RWST
RWST
14h
FFh
DRARTIM: dual rank auto-refresh timing- stagger of commands
between ranks
TREQERR: reset handshake time out count
(counts in x16 of core clock)
If times out - forces DRAMs into self-reset even if no handshake received
from MemBIST or other logic after link goes into fast reset
14.6.1.7
DQSFAIL
There are two DQSFAIL registers that contain a total of 36 individual DQS failure status
bits. There is one status bit for each DQS signal pair on each rank. These bits are set
automatically by hardware during the receiver enable calibration if a valid DQS
waveform is not detected. Hardware will not clear any bits that are set prior to the
calibration even if a valid waveform is detected. Hardware uses the DQSFAIL
information to exclude calibration data during the data gathering portion and/or the
data analysis portion of the both the receiver enable and DQS delay calibrations. This
prevents a failed DQS pin from corrupting the calibration of neighboring functional DQS
pins that may share internal logic resources with a failing DQS pin.
14.6.1.8
DQSFAIL1: DQS Failure Configuration Register 1
Device:
NodeID
Function: 4
Offset:
Bit
9Ch
Attr
Default
Description
7:4
3
RV
0h
0
Reserved
RWST
RWST
RWST
RWST
r1dqs17: rank 1
r1dqs08: rank 1
r1dqs16: rank 1
r1dqs07: rank 1
2
0
1
0
0
0
Intel® 6400/6402 Advanced Memory Buffer Datasheet
211
Registers
14.6.1.9
DQSFAIL0: DQS Failure Configuration Register 0
Device:
NodeID
Function: 4
Offset:
Bit
A0h
Attr
Default
Description
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
r1dqs15: rank 1
r1dqs06: rank 1
r1dqs14: rank 1
r1dqs05: rank 1
r1dqs13: rank 1
r1dqs04: rank 1
r1dqs12: rank 1
r1dqs03: rank 1
r1dqs11: rank 1
r1dqs02: rank 1
r1dqs10: rank 1
r1dqs01: rank 1
r1dqs09: rank 1
r1dqs00: rank 1
r0dqs17: rank 0
r0dqs08: rank 0
r0dqs16: rank 0
r0dqs07: rank 0
r0dqs15: rank 0
r0dqs06: rank 0
r0dqs14: rank 0
r0dqs05: rank 0
r0dqs13: rank 0
r0dqs04: rank 0
r0dqs12: rank 0
r0dqs03: rank 0
r0dqs11: rank 0
r0dqs02: rank 0
r0dqs10: rank 0
r0dqs01: rank 0
r0dqs09: rank 0
r0dqs00: rank 0
8
7
6
5
4
3
2
1
0
14.6.1.10 DRRTC: Receive Enable Reference Output Timing Control Registers
Note:
These registers have to be saved and restored on S3.
212
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
The DRRTC is a set of three registers with DQS receiver enable window timing control
for each byte on the DDR data bus. There is a single control for each byte for both
ranks. A correct register setting will delay the start of the enable window so that it
coincides with the middle of the DQS pre-amble. Enabling the window before or after
the pre-amble would cause valid DQS edges to be missed or invalid edges or noise to
be received.
The range of the enable delay, controlled by the DRRTC registers, is eight cycles, with a
granularity defined by the SPDPAR06CUR.MASTCNTL register. The delay is measured
from the AMC core clock edge that launches a “read” command on the DDR command
bus. The minimum delay is equal to the DDR SDRAM read latency defined in the
DRC.CL and DRC.AL register fields. The maximum delay is the read latency plus eight
cycles. In addition to these major sources of delay, there is also a small
“uncompensated delay” as shown in the formulas below.
The RCVEN fields of the DRRTC register control the delay as follows: bits [7:5] control
whole clock increments, bits [4:3] control in quarter clock increments, and bits [2:0]
control the sub-quarter cycle increments. Setting RCVEN to 0x0 produces the minimum
delay, and 0xFF sets the maximum delay. The sub-quarter cycle delay is defined by the
equations and “RCVEN_OUT” lookup table below:
Delay_Uncomp = 100ps; Note: estimate only
Delay Element = (quarter CMDCLK period - Delay_Uncomp) / ( MASTCNTL + 0.5)
sub quarter cycle delay = Delay_Uncomp + (Delay Element * RCVEN_OUT[2:0])
RCVEN_OUT Lookup Table
DRRTC RCVEN [2:0]
SPDPAR06CUR
MASTCNTL]
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
6
5
4
4
3
2
1
0
5
5
4
3
2
2
1
0
4
4
3
3
2
1
1
0
3
3
2
2
1
1
0
0
2
2
1
1
1
0
0
0
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
For example, if the SPDPAR06CUR.MASTCNTL is set to 0x7, the receiver enable delay
can be varied over eight cycle in 256 steps, one step for each DRRTC RCVEN setting. If
SPDPAR06CUR.MASTCNTL is set to 0x3, however, the number of steps is reduced to
128, such that half of the DRRTC RCVEN settings do not produce an increase in delay
from the previous setting.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
213
Registers
14.6.1.11 DRRTC00: Receive Enable Reference Output Timing Control Register
This register determines DQS12, 3, 11, 2, 10, 1, 9, & 0 input buffer enable timing delay
Device:
NodeID
Function: 4
Offset:
Bit
A4h
Attr
Default
Description
31:24
23:16
15:8
7:0
RWST
RWST
RWST
RWST
20h
20h
20h
20h
RCVEN1203: receiver enable delay for DQS12 and 3
RCVEN1102: receiver enable delay for DQS11 and 2
RCVEN1001: receiver enable delay for DQS10 and 1
RCVEN0900: receiver enable delay for DQS9 and 0
14.6.1.12 DRRTC01: Receive Enable Reference Output Timing Control Register
This register determines DQS16, 7, 15, 6, 14, 5, 13, & 4 input buffer enable timing
delay.
Device:
NodeID
Function: 4
Offset:
Bit
A8h
Attr
Default
Description
31:24
23:16
15:8
7:0
RWST
RWST
RWST
RWST
20h
20h
20h
20h
RCVEN1607: receiver enable delay for DQS16 and 7
RCVEN1506: receiver enable delay for DQS15 and 6
RCVEN1405: receiver enable delay for DQS14 and 5
RCVEN1304: receiver enable delay for DQS13 and 4
14.6.1.13 DRRTC02: Receive Enable Reference Output Timing Control Register
This register determines DQS17 & 8 input buffer enable timing delay.
Device:
NodeID
Function: 4
Offset:
C4h
Bit
Attr
Default
Description
7:0
RWST
20h
RCVEN1708: receiver enable delay for DQS17 and 8
14.6.1.14 DQS Calibration Registers
The DQSOFCS is a group of six registers that control the fine delay used to center DQS
edges to the DQ data eye during read operations. There is a delay entry for each nibble
of the DDR data bus for each rank. The coarse delay is controlled by the DRAMDLLC
register. The equations for the fine and coarse delays are shown below. Note that
“Delay Element” and “Delay_Uncomp” are defined in the DRRTC register section. Also
note that there is a separate coarse delay control for each “chunk” of the DDR I/O
cluster as defined in the DRAMDLLC register section.
slvlen_not_at_max[m] = DRAMDLLC.SLVLENm[2:0] < 7; where m is the DDR I/O
cluster chunk number
increment_slvlen[i,n] = slvlen_not_at_max AND ( DQSOFCSi.DQSn[3:0] > 7 ); where i
and n are the DQSOFCS register and DQS field numbers respectively
214
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
slvlen[i,m,n] = DRAMDLLC.SLVLENm[2:0] + increment_slvlen[i,n]
Programable_Delay[i,m,n] = ( Delay Element ) * ( slvlen[i,m,n] + 0.5 +
DQSOFCSi.DQSn[2:0]/8 )
DQS_Delay[i,m,n] = Delay_Uncomp + Programmable_Delay[i,m,n]
Note: these registers may have to be saved and restored on S3
14.6.1.15 DQSOFCS00: DQS Calibration Register
This register determines DQS12, 3, 11, 2, 10, 1, 9, & 0 fine DQS delay when reading
from rank 0.
Device:
NodeID
Function: 4
Offset:
Bit
B4h
Attr
Default
Description
31:28
27:24
23:20
19:16
15:12
11:8
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0h
0h
0h
0h
0h
0h
0h
0h
DQS12: Fine delay
DQS03: Fine delay
DQS11: Fine delay
DQS02: Fine delay
DQS10: Fine delay
DQS01: Fine delay
DQS09: Fine delay
DQS00: Fine delay
7:4
3:0
14.6.1.16 DQSOFCS01: DQS Calibration Register
This register determines DQS16, 7, 15, 6, 14, 5, 13, & 4 fine DQS delay when reading
from rank 0.
Device:
NodeID
Function: 4
Offset:
Bit
B8h
Attr
Default
Description
31:28
27:24
23:20
19:16
15:12
11:8
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0h
0h
0h
0h
0h
0h
0h
0h
DQS16: Fine delay
DQS07: Fine delay
DQS15: Fine delay
DQS06: Fine delay
DQS14: Fine delay
DQS05: Fine delay
DQS13: Fine delay
DQS04: Fine delay
7:4
3:0
Intel® 6400/6402 Advanced Memory Buffer Datasheet
215
Registers
14.6.1.17 DQSOFCS02: DQS Calibration Register
This register determines DQS17 & 8 fine DQS delay when reading from rank 0.
Device:
NodeID
Function: 4
Offset:
Bit
C6h
Attr
Default
Description
7:4
3:0
RWST
RWST
0h
0h
DQS17: Fine DLL delay
DQS08: Fine DLL delay
14.6.1.18 DQSOFCS10: DQS Calibration Register
This register determines DQS12, 3, 11, 2, 10, 1, 9, & 0 fine DQS delay when reading
from rank 1.
Device:
NodeID
Function: 4
Offset:
Bit
BCh
Attr
Default
Description
31:28
27:24
23:20
19:16
15:12
11:8
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0h
0h
0h
0h
0h
0h
0h
0h
DQS12: Fine delay
DQS03: Fine delay
DQS11: Fine delay
DQS02: Fine delay
DQS10: Fine delay
DQS01: Fine delay
DQS09: Fine delay
DQS00: Fine delay
7:4
3:0
14.6.1.19 DQSOFCS11: DQS Calibration Register
This register determines DQS16, 7, 15, 6, 14, 5, 13, & 4 fine DQS delay when reading
from rank 1.
.
Device:
NodeID
Function: 4
Offset:
Bit
C0h
Attr
Default
Description
31:28
27:24
23:20
19:16
15:12
11:8
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0h
0h
0h
0h
0h
0h
0h
0h
DQS16: Fine delay
DQS07: Fine delay
DQS15: Fine delay
DQS06: Fine delay
DQS14: Fine delay
DQS05: Fine delay
DQS13: Fine delay
DQS04: Fine delay
7:4
3:0
216
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.6.1.20 DQSOFCS12: DQS Calibration Register
This register determines DQS17 & 8 fine DQS delay when reading from rank 1.
Device:
NodeID
Function: 4
Offset:
Bit
C7h
Attr
Default
Description
7:4
3:0
RWST
RWST
0h
0h
DQS17: Fine DLL delay
DQS08: Fine DLL delay
14.6.1.21 WPTRTC DDR I/O Write Pointer Timing
The two WPTRTC registers control the fine delay of the DDR I/O FIFO write pointers.
The formulas for delay shown in the DQSOFCS and DRRTC register sections are
identical to the write pointer delay formulas. To find the WPTRTC portion of write
pointer delay, use the DQSOFCS formulas, and substitute WPTRTC fields for all the
DQSOFCS fields. The only difference in the application of these formulas is that there is
only one WPTRTC field per byte of the DDR I/O, whereas the DQSOFCS has a field per
nibble per rank. The total write pointer delay, measured from the same reference point
as the DQS receiver enable timing, is equal to the DQS receiver enable timing,
including the quarter clock and sub-quarter clock delays, plus one full clock cycle, plus
the coarse and fine DRAMDLLC.SLVLEN/WPTRTC delays calculated with the formulas
from the DQSOFCS register section.
14.6.1.22 WPTRTC0: Write Pointer Timing Control 0
This register determines the DDR I/O FIFO write pointer fine delay timing for all DQS
signals except DQS17 and DQS8 when reading from rank 0 or rank 1.
Device:
NodeID
Function: 4
Offset:
Bit
CCh
Attr
Default
Description
31:28
27:24
23:20
19:16
15:12
11:8
RWST
RWST
RWST
RWST
RWST
RWST
RWST
RWST
0h
0h
0h
0h
0h
0h
0h
0h
DQS1607: DQS16 and DQS7 write pointer fine delay
DQS1506: DQS15 and DQS6 write pointer fine delay
DQS1405: DQS14 and DQS5 write pointer fine delay
DQS1304: DQS13 and DQS4 write pointer fine delay
DQS1203: DQS12 and DQS3 write pointer fine delay
DQS1102: DQS11 and DQS2 write pointer fine delay
DQS1001: DQS10 and DQS1 write pointer fine delay
DQS0900: DQS9 and DQS0 write pointer fine delay
7:4
3:0
Intel® 6400/6402 Advanced Memory Buffer Datasheet
217
Registers
14.6.1.23 WPTRTC1: Write Pointer Timing Control 1
This register determines the DDR I/O FIFO write pointer fine delay timing for DQS17
and DQS8 signals when reading from rank 0 or rank 1.
Device:
NodeID
Function: 4
Offset:
Bit
D0h
Attr
Default
Description
7:4
3:0
RV
0h
0h
Reserved
DQS01708: Rank 0 DQS17 and DQS8 write pointer fine delay
RWST
14.6.1.24 DDQSCVDP and DDQSCADP
This set of 4 registers defines two 64 bit long data patterns used in the DQS Delay
Calibration. They are only used when DCALCSR.BASPAT is low. The 64 bit patterns
cover a data burst that is 32 DRAM clock cycles long. The DDQSCVDP registers define
the “victim” pattern, and the DDQSCADP defines the “aggressor” pattern. The victim
pattern is applied to one bit of each byte of the DDR data bus for 32 clock cycles, and
the aggressor pattern is applied to all other bits. The victim pattern is applied in turn to
each bit of each byte, creating a complete data pattern that is 8*32 data cycles long.
14.6.1.25 DDQSCVDP0: DQS DELAY CAL PATTERN 0
This register defines the last 32 bits of the 64 bit long “victim” data pattern.
Device:
NodeID
Function: 4
Offset:
D4h
Bit
Attr
Default
Description
31:0
RW
aaaa0a05h ENABLE:
14.6.1.26 DDQSCVDP1: DQS DELAY CAL PATTERN 1
This register defines the first 32 bits of the 64 bit long “victim” data pattern.
Device:
NodeID
Function: 4
Offset:
D8h
Bit
Attr
Default
Description
31:0
RW
5b339c5dh ENABLE:
14.6.1.27 DDQSCADP0: DQS DELAY CAL PATTERN 0
This register defines the last 32 bits of the 64 bit long “aggressor” data pattern.
Device:
NodeID
Function: 4
Offset:
DCh
Bit
Attr
Default
Description
31:0
RW
aaabffffh
ENABLE:
218
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.6.1.28 DDQSCADP1: DQS DELAY CAL PATTERN 1
This register defines the first 32 bits of the 64 bit long “aggressor” data pattern.
Device:
NodeID
Function: 4
Offset:
E0h
Bit
Attr
Default
Description
31:0
RW
db339ce1h ENABLE:
14.6.2
Memory Interface Control
14.6.2.1
DIOMON: DDR I/O Monitor
This register monitors the legsel output of the DDR I/O topcdat chunk and controls the
A/D converter in the DDR I/O used to monitor analog voltage levels.
Device:
NodeID
Function: 4
Offset:
Bit
F0h
Attr
Default
Description
15
14:12
11:8
7
RW
0
0h
0h
0h
0h
00h
ENABLE: Enable A/D converter and update vresult
BIASSEL: A/D converter input selection
LEGSELOUT: Legsel output of topcdat chunk
DIOPWR:
RWST
RWST
RWST
RV
6
Reserved
5:0
RWST
VRESULT: A/D converter output
14.6.2.2
ODTZTC: On-Die Termination Timing Control
This register controls the enable and disable timing of the on-die termination on DQ
and DQS pins. Timing can be adjusted in whole clock increments, or enabled statically.
The ETIMR and DTIMR fields are added in hardware to the SPDPAR13CUR.ODTZ_ETIMR
and SPDPAR13CUR.ODTZ_DTIMR register fields to control termination timing during
reads. The DRRTC register is also used to align the enable/disable time to when read
DQ/DQS signals are expected to arrive at the input pins. The combined default values
of the ODTZTC and SPDPAR13CUR fields enable termination 1/2 DRAM clock cycle
before the leading edge of the read DQS preamble arrives at the DQS pin, and keeps
termination enabled for 5 clock cycles in BL4 mode, and 7 cycles in BL8 mode. The DDR
I/O circuits automatically disable on-die termination when the DQ/DQS pins are
driving. The default register values enable termination during writes at the same time
that the pins are driving, so termination is effectively off during writes.
Device:
NodeID
Function: 4
Offset:
F4h
Bit
Attr
Default
Description
15
RWST
0
TIMORIDE: timing override. On-Die termination always on during read
operations and when the bus is idle
14:12
11
RWST
RV
0h
0
DTIMW: disable time after write data
Reserved
Intel® 6400/6402 Advanced Memory Buffer Datasheet
219
Registers
Device:
NodeID
Function: 4
Offset:
Bit
F4h
Attr
Default
Description
DTIMR: disable time after read data
10:8
7:4
RWST
RWST
RWST
0h
0h
0h
ETIMW: enable time before write data
ETIMR: enable time before read data
3:0
14.6.2.3
DRAMISCTL: Miscellaneous DRAM DDR Cluster Control
Device:
NodeID
Function: 4
Offset:
Bit
F8h
Attr
Default
Description
31:13
12
RV
0000h Reserved
RWST
1
VOXSTART: Enable the voltage output crossing control loop in the DDR
I/O. This bit is AND’ed with the SPDPAR1011CUR.vox_start bit.
11
10
RW
RW
0
0
AVMODE: analog validation mode
OCDLOADENABLE: calibration load placed on incoming signals for DDR2
DRAM OCD calibration
9
8
RW
RW
0
0
OCDPOLSEL: set for pull up calibration, clear for pull down
OCDRCOMPEN:
7:0
RWST
11h
VREFSEL: vref selection
Details of DRAMISCTL VREF Field
Description
Settin
g
TBD
14.6.2.4
DDR2ODTC: DDR2 DRAM On-Die Termination Control
The DDR2ODTC controls the behavior of the ODT output (one ODT output per command
bus copy). There is a separate field to control the behavior for reads to rank0, reads to
rank1, writes to rank0, and writes to rank1. Only the lsb of each field is used, and the
msb has no effect. When an lsb of a field is set to one, the ODT pins will drive high, at
the appropriate time relative to data on the DDR bus, when the selected transaction
(read or write) is issued to the selected rank (0 or 1). If a field is set to 0, the ODT
output continues to drive low during the transaction, as it does during idle cycles.
Device:
NodeID
Function: 4
Offset:
FCh
Bit
Attr
Default
Description
7:6
RWST
0h
R1ODTWR: ODT control during writes to CS1
x1: ODT pins will drive high
x0: ODT pins remain driving low
5:4
3:2
RWST
RWST
0h
0h
R1ODTRD: ODT control during reads to CS1
R0ODTWR: ODT control during writes to CS0
220
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 4
Offset:
FCh
Bit
Attr
Default
Description
1:0
RWST
0h
R0ODTRD: ODT control during reads to CS0
14.6.2.5
DRAMDLLC: DDR I/O DLL Control
The formulas that show how the SLVLEN fields affect DQS delay timing are shown in
the DQSOFCS register definition section. The SLVLEN fields are set by hardware during
the DQS delay calibration. There are five SLVLEN fields, one for each “chunk”, or two
bytes, of the DDR I/O DQ pins. The SLVBYP bit can be toggled to reset the master DLL’s
in the DDR I/O.
Device:
NodeID
Function: 4
Offset:
Bit
C8h
Attr
Default
Description
23:22
21
RV
00h
0h
Reserved
RW
SLVBYP: DQS delay bypass
20:18
17:15
14:12
11:9
8:6
RWST
RWST
RWST
RWST
RWST
RV
3h
SLVLEN4: dqs17 & 8 coarse DQS delay
SLVLEN3: dqs16, 7, 15, & 6 coarse DQS delay
SLVLEN2: dqs14, 5, 13, & 4 coarse DQS delay
SLVLEN1: dqs12, 3, 11, & 2 coarse DQS delay
SLVLEN0: dqs10, 1, 9, & 0 coarse DQS delay
Reserved
3h
3h
3h
3h
5:0
00h
14.6.3
Firmware Support Registers
14.6.3.1
FIVESREG: Fixed 5’s Pattern
Constant value used for debug.
Device:
NodeID
Function: 4
Offset:
E8h
Bit
Attr
Default
Description
31:0
RO
55555555h FIVES: Hardwired to 5’s for read-return
14.6.3.2
AAAAREG: Fixed A’s Pattern
Constant value used for debug.
Device:
NodeID
Function: 4
Offset:
ECh
Bit
Attr
Default
Description
31:0
RO
AAAAAAAAh
AAAAS: Hardwired to A’s for read-return
Intel® 6400/6402 Advanced Memory Buffer Datasheet
221
Registers
14.7
DFX Registers (Function 5)
14.7.1
Transparent Mode Registers
14.7.1.1
TRANSCFG: Transparent Mode Configuration
This register enables and controls FBD DFX transparent mode features.
.
Device:
NodeID
Function: 5
Offset:
Bit
3Ch
Attr
Default
Description
31:29
28
RV
0h
0
Reserved
RWST
ENDOUT: enable data output on transparent data/status pins when
set, output status when clear
27
RWST
0
LGFBITS: log bits that fail the compare when set, log raw read data
when clear.
26
RWST
RWST
0
LGFFAIL: log first failure in any burst position.
25:24
00
BSTPOS: burst position to log data/failed bits from when LGFFAIL bit
is not set.
0 = first burst in bl4 or bl8 mode
1 = last burst of bl4, second burst of bl8
2 = third burst of bl8
3 = last burst of bl8
23:20
19:16
RWST
RWST
0h
0h
DRAMRD: byte of data bus selected to be output on transparent
data/status pins when ENDOUT bit is set.
8= DQS 17 and DQS 8
7= DQS 16 and DQS 7
...
0 = DQS 9 and DQS 0
DRAMWR: byte of data bus selected to receive transparent write
data, and byte of data bus to be compared against transparent read
data.
Fh = all bytes
8= DQS 17 and DQS 8
7= DQS 16 and DQS 7
...
0 = DQS 9 and DQS 0
15:0
RWST
0000h
DFTDATA: default data for bytes not selected by the DRAMWR field.
This field has early/even data in the upper 8 bits, and late/odd data
in the lower 8 bits.
14.7.1.2
TRANDERR[8:0]: Transparent Mode Data Error Logs
This register stores data returned from DRAM byte groups on failing transparent mode
tests.
Device:
NodeID
Function: 5
Offset:
Bit
50h, 4Eh, 4Ch, 4Ah, 48h,46h, 44h, 42h, 40h
Attr
Default
Description
15:8
7:0
RWST
RWST
00h
00h
LATE_DATA:
EARLY_DATA:
14.7.1.3
TRANSCTRL: Transparent Mode Control
222
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
This register enables and controls FBD DFX transparent mode features.
Device:
NodeID
Function: 5
Offset:
Bit
80h
Attr
Default
Description
7:1
0
RV
00h
0
Reserved
RWST
ENTRNSPMODE: Transparency Mode Enable
1 - Enables Transparency Mod
14.7.2
Logic Analyzer Interface (LAI) Registers
14.7.2.1
LAI: LAI Operation Modes
This register controls and reports the AMB’s LAI mode and Qual controls.
Device:
NodeID
Function: 5
Offset:
Bit
B8h
Attr
Default
Description
31:16
15
RV
0000h
0
Reserved
RWST
RAWMODE: data connected to LAI
0: LAI outputs contain initialization state information prior to L0S then lane
data after L0S
1: LAI outputs connected to FBD data inputs even though valid timing is not
present
14
13
RV
0
0
Reserved
RWST
QUALMODE:
Assert Qual for all non-filtered frames, or only assert Qual for all non-filtered
frames between start and stop events.
0: Ignore Qual start/stop events
1: Assert Qual after a start event, and deassert Qual after a stop events
12
RWST
0
FILTERSYNC:
Filter the frame (do not assert Qual) if the frame is a sync.
0: Disable sync filtering
1: Enable sync filtering
11:6
5:0
RV
00h
3Fh
Reserved
RWST
QUALPERIOD:
Additional number of frames Qual remains asserted
Power-on default to 63
14.7.2.2
SBMATCHU: Upper Southbound Match Register
This register sets the upper 8 bits of data match for three southbound commands.
Device:
NodeID
Function: 5
Offset:
BCh
Bit
Attr
Default
Description
31:24
RV
00h
00h
Reserved
CMD2:
23:16 RWST
Upper 8 bits [39:32] of southbound command 2
Intel® 6400/6402 Advanced Memory Buffer Datasheet
223
Registers
Device:
NodeID
Function: 5
Offset:
BCh
Bit
Attr
Default
Description
15:8
RWST
00h
CMD1:
Upper 8 bits [39:32] of southbound command 1
7:0
RWST
00h
CMD0:
Upper 8 bits [39:32] of southbound command 0
Match and Mask bit numbering of SB frames is as follows:
• where N= 0 for slot A, 4 for slot B and 8 for slot C
Table 14-17.Bit Locations for SB Match and Mask
Xfr\lane
0 + N
9
8
7
6
5
4
3
2
1
0
B36
B32
B28
B24
B20
B16
B12
B8
B9
B4
B5
B6
B7
B0
B37
B38
B39
B33
B34
B35
B29
B30
B31
B25
B26
B27
B21
B22
B23
B17
B18
B19
B13
B14
B15
B1
B2
B3
1 + N
B10
B11
2 + N
3 + N
14.7.2.3
SBMATCHL0: Lower Southbound Match Register 0
This register sets the lower 32 bits of data match for match southbound command 0.
Device:
NodeID
Function: 5
Offset:
C0h
Bit
Attr
Default
Description
31:0
RWST
00004000h
CMD:
Lower 32bits [31:0] of southbound command
power on default = match Synch
14.7.2.4
SBMATCHL1: Lower Southbound Match Register 1
This register sets the lower 32 bits of data match for match southbound command 1.
Device:
NodeID
Function: 5
Offset:
C4h
Bit
Attr
Default
Description
31:0
RWST
00100000h
CMD:
Lower 32bits [31:0] of southbound command
power on default = match Activate
224
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.7.2.5
SBMATCHL2: Lower Southbound Match Register 2
This register sets the lower 32 bits of data match for match southbound command 2.
Device:
NodeID
Function: 5
Offset:
C8h
Bit
Attr
Default
Description
31:0
RWST
00014000h
CMD:
Lower 32bits [31:0] of southbound command
power on default = match Write Config Reg
14.7.2.6
SBMASKU: Upper Southbound Mask Register
This register sets the upper 8 bits of data mask for three southbound commands.
Device:
NodeID
Function: 5
Offset:
Bit
CCh
Attr
Default
Description
31:24
23:16
RV
00h
00h
Reserved
RWST
CMDMASK2:
Upper 8 bits [39:32] of southbound command 2 mask
0: Do not include this bit in match comparison
1: Include this bit in match comparison
15:8
7:0
RWST
RWST
00h
00h
CMDMASK1:
Upper 8 bits [39:32] of southbound command 1 mask
0: Do not include this bit in match comparison
1: Include this bit in match comparison
CMDMASK0:
Upper 8 bits [39:32] of southbound command 0 mask
0: Do not include this bit in match comparison
1: Include this bit in match comparison
14.7.2.7
SBMASKL0: Lower Southbound Mask Register 0
This register sets the lower 32 bits of data mask for match southbound command 0.
Device:
NodeID
Function: 5
Offset:
D0h
Bit
Attr
Default
Description
31:0
RWST
031FC000h
CMDMASK:
Lower 32bits [31:0] of southbound command mask.
0: Do not include this bit in match comparison
1: Include this bit in match comparison
power on default = match Sync
Intel® 6400/6402 Advanced Memory Buffer Datasheet
225
Registers
14.7.2.8
SBMASKL1: Lower Southbound Mask Register 1
This register sets the lower 32 bits of data mask for match southbound command 1.
Device:
NodeID
Function: 5
Offset:
Bit
D4h
Attr
Default
Description
31:0 RWST
00100000h
CMDMASK:
Lower 32bits [31:0] of southbound command mask.
0: Do not include this bit in match comparison
1: Include this bit in match comparison
power on default = match Activate
14.7.2.9
SBMASKL2: Lower Southbound Mask Register 2
This register sets the lower 32 bits of data mask for match southbound command 2.
Device:
NodeID
Function: 5
Offset:
D8h
Bit
Attr
Default
Description
31:0
RWST
001FC000h
CMDMASK:
Lower 32bits [31:0] of southbound command mask.
0: Do not include this bit in match comparison
1: Include this bit in match comparison
power on default = match Write Config Reg
14.7.2.10 MMEVENTSEL: Match/Mask Event Selection Register
Selects 1 of 13 local match events described below for promotion to local event select.
Three local events MMEVENT[2:0] can be associated with one of these local match
events.
Device:
NodeID
Function: 5
Offset:
Bit
DCh
Attr
Default
Description
15:12
11:8
RV
0h
2h
Reserved
RWST
MMEVENT2SEL:
default: match pattern 0 to slot A only for sync
7:4
3:0
RWST
RWST
Ah
3h
MMEVENT1SEL:
default: match pattern 1 to slot A, B, or C for activate
MMEVENT0SEL:
default: match pattern 2 to slot B only for write config reg
.
MM
Event
Description
15:13
12
Reserved
FRAMEMATCH
Bit pattern in slot A matches SBMATCH/SBMASK 0 AND
Bit pattern in slot B matches SBMATCH/SBMASK 1 AND
Bit pattern in slot C matches SBMATCH/SBMASK 2
226
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
MM
Event
Description
11
10
9
SLOTMATCH0
Command in slot A, B, or C matches SBMATCH/SBMASK 0
SLOTMATCH1
Command in slot A, B, or C matches SBMATCH/SBMASK 1
SLOTMATCH2
Command in slot A, B, or C matches SBMATCH/SBMASK 2
8
SLOTCMATCH0
Command in slot C matches SBMATCH/SBMASK 0
7
SLOTCMATCH1
Command in slot C matches SBMATCH/SBMASK 1
6
SLOTCMATCH2
Command in slot C matches SBMATCH/SBMASK 2
5
SLOTBMATCH0
Command in slot B matches SBMATCH/SBMASK 0
4
SLOTBMATCH1
Command in slot B matches SBMATCH/SBMASK 1
3
SLOTBMATCH2
Command in slot B matches SBMATCH/SBMASK 2
2
SLOTAMATCH0
Command in slot A matches SBMATCH/SBMASK 0
1
SLOTAMATCH1
Command in slot A matches SBMATCH/SBMASK 1
0
SLOTAMATCH2
Command in slot A matches SBMATCH/SBMASK 2
14.7.2.11 EVENTSEL0: Event Selection Register
In LAI mode, selects 1 of 32 local events (see EVENT register) for 2 uses (Qual Start
and Qual Stop) and sets programmable delay for QualStop. In Normal mode, selects
local event for 2 uses (error injection and NB in-band event signaling) and sets
programmable delay for error injection.
Device:
NodeID
Function: 5
Offset:
E0h
Bit
Attr
Default
Description
31:21
RV
00h
3Fh
Reserved
20:15 RWST
QUALSTOPDELAY: in LAI Mode
Additional number of clocks QualStop is delayed before use (0 to
63)
Power-on default to 63
INJERRORDELAY: in Normal Mode
Additional number of clocks INJERROR is delayed before use (0 to
63)
Power-on default to 63
14:10
RW
00h
INBAND: in LAI Mode
No effect. Northbound in-band debug events can not be asserted
in LAI mode
INBAND: in Normal Mode
If selected event occurs, assert the northbound in-band event bit
in next sync status 0 return and in FBDS0.S3
Intel® 6400/6402 Advanced Memory Buffer Datasheet
227
Registers
Device:
NodeID
Function: 5
Offset:
E0h
Bit
Attr
Default
Description
QUALSTART: in LAI Mode
9:5
RWST
00h
If selected event occurs, enable assertion of Qual until next
QUALSTOP
4:0
RWST
00h
QUALSTOP: in LAI Mode
•
If selected event occurs, disable assertion of Qual until next
QUALSTART
INJERROR: in Normal Mode
If selected event occurs, inject error selected by EICNTL
•
14.7.2.12 EVENTSEL1: Event Selection Register
Selects 1 of 32 local events (see EVENT register) for each of six events transmitted to
the LAI interface (events[5:0]).
Device:
NodeID
Function: 5
Offset:
Bit
E4h
Attr
Default
Description
31:30
29:25
RV
00
Reserved
RWST
0Ah
LAITRIGGER5:
Local event selected and transmitted to LAI as TRIGGER5
Default on power on to MM[1] event= Activate on any
command
24:20
RWST
0Bh
LAITRIGGER4:
Local event selected and transmitted to LAI as TRIGGER4
Default on power on to MM[2] event= Sync command in slot
A
19:15
14:10
9:5
RWST
RWST
RWST
RWST
13h
12h
11h
10h
LAITRIGGER3:
Local event selected and transmitted to LAI as TRIGGER3
Default on power on to select in-band debug event 3
LAITRIGGER2:
Local event selected and transmitted to LAI as TRIGGER2
Default on power on to select in-band debug event 2
LAITRIGGER1:
Local event selected and transmitted to LAI as TRIGGER1
Default on power on to select in-band debug event 1
4:0
LAITRIGGER0:
Local event selected and transmitted to LAI as TRIGGER0
Default on power on to select in-band debug event 0
14.7.2.13 EVENTSEL2: Event Selection Register
Selects 1 of 32 local events (see EVENT register) for each of five events transmitted to
the LAI interface (events[10:6]).
Device:
NodeID
Function: 5
Offset:
E8h
Bit
Attr
Default
Description
31:30
RV
00
Reserved
228
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 5
Offset:
Bit
E8h
Attr
Default
Description
29:25
24:20
RV
00h
04h
Reserved
RWST
LAITRIGGER10:
Local event selected and transmitted to LAI as TRIGGER10
Default on power on to SB Unit Testing State detect
19:15
14:10
9:5
RWST
RWST
RWST
RWST
1Ah
0Dh
0Ch
09h
LAITRIGGER9:
Local event selected and transmitted to LAI as TRIGGER9
Default on power on to SB CRC error detect
LAITRIGGER8:
Local event selected and transmitted to LAI as TRIGGER8
Default on power on to Event Bus[1] event
LAITRIGGER7:
Local event selected and transmitted to LAI as TRIGGER7
Default on power on to Event Bus[0] event
4:0
LAITRIGGER6:
Local event selected and transmitted to LAI as TRIGGER6
Default on power on to MM[0] event= Write Register in
command slot B
14.7.2.14 EVENT: Local LAI Event Register
This register sets a bit if a local event is hit. Except for QUALFLAG, most local event
signal internal to the AMB may assert for only one cycle. The event bits in this register
remain set once asserted so that the history of the event being set is not lost.
Note: The 5-bit select fields in the EVENTSEL0, EVENTSEL1, EVENTSEL2 and EVBUS
registers use the bit mapping of this register to identify which local event to select.
• For example, if EVENTSEL1.laitrigger0[4:0] = 26 decimal then trigger0 is
connected to the SB CRC error event.
• For example, if EVENTSEL1.laitrigger0[4:0] = 12 decimal then trigger0 is
connected to the inbound EVBus[0] event, and so forth.
Device:
NodeID
Function: 5
Offset:
Bit
F0h
Attr
Default
Description
31
RWCST
RWCST
0
Spare:
30:25
00h
ERROR EVENTS:
•
SB/NB failover[25],
when unmasked:
•
•
•
•
•
SB CRC error[26],
thermal overload[27],
clock training violation (< 6 transitions in 512 UI) [28],
unimplemented register access[29],
other implementation specific errors[30]
set on event and cleared by writing
24
RWCST
RWCST
0
QUALFLAG:
23:16
00h
INBANDEV: SB link in-band EV[7:0]
set on event and cleared by writing
Intel® 6400/6402 Advanced Memory Buffer Datasheet
229
Registers
Device:
NodeID
Function: 5
Offset:
F0h
Bit
Attr
Default
Description
15:12
RWCST
0h
EV: Event Bus EV[3:0]
set on event and cleared by writing
11:9
8:1
RWCST
RWST
0h
0h
MMEVENT: MMEVENT[2:0] selected by MMEVENTSEL
set on event and cleared by writing
LINKST: FBD Link State: Disable[1], calibrate[2], training[3],
testing[4], pollling[5], config[6], l0[7], L0s or recalibrate[8]
One hot encoding of FBD link state
0
RO
0
NULL: Null Event: Bit never set
14.7.3
Error Injection Registers
14.7.3.1
EICNTL: Error Injection Control
This register controls the AMB error injection logic.
Device:
NodeID
Function: 5
Offset:
FCh
Bit
Attr
Default
Description
EIEN:Error Injection Enable
7
RW
0
1= Error Injection enabled
0= Error Injection disabled
6:4
RW
000
EITYPE: Type of error injection
111 = Reserved;
110 = Reserved
101 = Force NB Error bit on next Status return
100 = Force Alert on event
011 = Reserved
010 =Reserved
001= Corrupt NB CRC on event
000= No error injection
3:0
RV
0h
Reserved
14.7.3.2
STUCKL: Stuck “ON” FBD Lanes
This register selects FBD Lanes to be stuck at “Electrical Idle” following a write to this
register.
Device:
NodeID
Function: 5
Offset:
Bit
FEh
Attr
Default
Description
7:4
3:0
RV
0h
Fh
Reserved
NBSTUCK: NB Lane to be driven to EI to simulate a failed lane
RWST
•
0h = lane 0: Dh = lane 13 and > 13 = NOP
230
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.8
Bring-up and Debug Registers (Function 6)
14.8.1
SPAD[1:0]: Scratch Pad
These bits have no effect upon the operation of the AMB. They are intended to be used
by software for tracking changes in AMB state. These two registers are in different
functions.
Device:
NodeID
Function: 7, 6
Offset:
7Ch
Bit
Attr
Default
Description
31:0
RW
0000_0000h FREE:
These bits are available for software definition.
®
14.8.2
Southbound FBD Intel Interconnect BIST Registers
®
14.8.2.1
SBFIBPORTCTL: Southbound FBD Intel Interconnect BIST Port
Control Register
This register controls the operation of the Intel® Interconnect BIST (Intel® IBIST)
logic. Please refer to Fully-Buffered DIMM DFx Specification for detailed description of
the operation of Intel IBIST.
Device:
NodeID
Function: 6
Offset:
Bit
80h
Attr
Default
Description
31:24
23
RV
00h
0
Reserved
RWST
SBNBMAP: Loopback mapping bit
This bit will be sent during TS1 to the slave to specify which lanes needs to be
looped back. Actual lanes looped back is specified in the FBD Architecture Spec.
22
RWST
0
CMMSTR: Compliance Measurement Mode start
This puts the Intel IBIST logic in CMM mode and Intel IBIST TX engine will start
transmitting Intel IBIST patterns.
21:12
11:8
RWCST
ROST
000h
0h
ERRCNT: Error Counter
Total number of frames with errors that were encountered by this port.
ERRLNNUM: Error Lane Number
This points to the first lane that encountered an error. If more than one lane
reports an error in a cycle, the most significant lane number that reported the
error will be logged.
7:6
RWCST
00
ERRSTAT: Port Error Status
When Intel IBIST is started, status goes to 01 until first start delimiter is
received and then goes to 00 until the end or to10 if an error occurs.
00: No error.
01: Did not receive first start delimiter.
10: Transmission error (first error).
11: Reserved for future use
5
RWST
0
AUTOINVSWPEN: Auto Inversion sweep enable
This bit enables the inversion shift register to continuously rotate the pattern in
the FIBTXSHFT and FIBRXSHFT registers.
0: Disable Auto-inversion
1: Enable Auto-inversions
Intel® 6400/6402 Advanced Memory Buffer Datasheet
231
Registers
Device:
NodeID
Function: 6
Offset:
80h
Bit
Attr
Default
Description
STOPONERR: Stop IBIST on Error
4
RWST
0
0: Do not stop on error, only update error counter
1: Stop on error
3
2
RWST
0
0
LOOPCON: Loop forever
0: No looping
1: Loop forever
RWCST
COMPLETE: IBIST done flag
This bit is set when the receive engine is done checking.
0: Not done
1: Done
1
0
RWST
RWST
0
0
MSTRMD: Master Mode Enable
When this bit is set along with IBISTR, the Intel IBIST transmit engine is
enabled to transmit Intel IBIST patterns.
0: Disable Master mode.
1: Enable master mode.
IBISTR: IBIST Start
When set, Intel IBIST starts transmitting after the TS1 header is recognized
during the next link initialization sequence. and MSTRMD bit is set.This bit also
enables the receive engine to start looking for the start delimiter during TS1
training set. This bit is reset when Intel IBIST receiver is done. The Intel IBIST
transmit and receive engines can be stopped by setting this bit to 0.
0: Stop IBIST transmitter
1: Start IBIST transmitter
14.8.2.2
SBFIBPGCTL: SB Intel IBIST Pattern Generator Control Register
This register contains bits to control the operation of the Intel IBIST pattern generator.
All counts are in 24 bit increments.
Device:
NodeID
Function: 6
Offset:
Bit
84h
Attr
Default
Description
OVRLOOPCNT: Overall Loop Count
31:26 RWST
0Fh
0h: Reserved
1h:3Fh: Number of times to loop all the patterns.
25:21 RWST
00h
CNSTGENCNT: Constant Generator Loop Counter
00h: Disable constant generator output
01h: 1Fh The number of times the constant generator counter pattern should loop
before going to the next component. Each count represents 24 bits of 1’s or 0’s.
20
RWST
0
CNSTGENSET: Constant Generator Setting
0: Generate 0
1: Generate 1
19:13 RWST
0Fh
MODLOOPCNT: Modulo-N Loop Counter
Each count represents 24 bits of the pattern specified by MODPERIOD.
00h: Disable Pattern Output
01h: 7Fh The number of times the Pattern Buffer should loop before going to the
next component.
232
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 6
Offset:
Bit
84h
Attr
Default
Description
12:10 RWST
001b
MODPERIOD: Period of the Modulo-N counter
Each encoding transmits a 24-bit pattern as specified below. All other encodings are
reserved.
001: L/2 - 0101_0101_0101_0101_0101_0101
010: L/4 - 0011_0011_0011_0011_0011_0011
011: L/6 - 0001_1100_0111_0001_1100_0111
100: L/8 - 0000_1111_0000_1111_0000_1111
110: L/24 - 0000_0000_0000_1111_1111_1111
9:3
2:0
RWST
RWST
0Fh
000
PATTLOOPCNT: Pattern Buffer Loop Counter
00h: Disable Pattern Output
01h: 7Fh The number of times the Pattern Buffer (FIBPATTBUF1) should be
repeated before going to the next component.
PTGENORD: Pattern Generation Order
000: Pattern Store + Modulo N Cntr + Constant Generator
001: Pattern Store + Constant Generator + Modulo N Cntr
010: Modulo N Cntr + Pattern Store + Constant Generator
011: Modulo N Cntr + Constant Generator + Pattern Store
100: Constant Generator + Pattern Store + Modulo N Cntr
101: Constant Generator + Modulo N Cntr + Pattern Store
110: Reserved
111: Reserved
14.8.2.3
SBFIBPATTBUF1: SB Intel IBIST Pattern Buffer 1 Register
This register contains the pattern bits used in Intel IBIST operations. Only the least
significant 24 bits are used. This user specified pattern goes out on to the link with the
least-significant 12 bits as the first frame and the most significant 12 bits as the
second frame.
Device:
NodeID
Function: 6
Offset:
Bit
88h
Attr
Default
Description
31:24
23:0
RV
RWST
00h
02ccfdh
Reserved
IBPATBUF: IBIST Pattern Buffer
Pattern buffer storing the default and the user programmable
pattern.
Default: 02ccfdh
14.8.2.4
SBFIBTXMSK: SB Intel IBIST Transmitter Mask Register
This register enables Intel IBIST operations for individual lanes. This mask only applies
to transmitters and not receivers.
Device:
NodeID
Function: 6
Offset:
Bit
8Ch
Attr
Default
Description
31:10
9:0
RV
000000h
3FFh
Reserved
TXMASK: Selects which channels to enable for testing.
RWST
Intel® 6400/6402 Advanced Memory Buffer Datasheet
233
Registers
14.8.2.5
SBFIBRXMSK: SB Intel IBIST Receiver Mask Register
This register enables Intel IBIST operations for individual lanes. This mask only applies
to receivers and not transmitters.
Device:
NodeID
Function: 6
Offset:
Bit
90h
Attr
Default
Description
31:10
9:0
RV
000000h
3FFh
Reserved
RXMASK: Selects which channels to enable for testing.
RWST
14.8.2.6
SBFIBTXSHFT: SB Intel IBIST Transmitter Inversion Shift Register
Each bit in this register enables inverting the patterns that is driven on corresponding
lanes. If AUTOINVSWPEN bit is set in port control register, the TXINVSHFT field is
rotated left at the completion of each pattern buffer set.
Device:
NodeID
Function: 6
Offset:
Bit
94h
Attr
Default
Description
31:10
9:0
RV
000000h
3FFh
Reserved
TXINVSHFT: Transmitter Inversion Shift Register.
RWST
14.8.2.7
SBFIBRXSHFT: SB Intel IBIST Receiver Inversion Shift Register
Each bit in this register enables inverting the patterns that is received on corresponding
lanes. If AUTOINVSWPEN bit is set in port control register, the RXINVSHFT field is
rotated left at the completion of each pattern buffer set.
Device:
NodeID
Function: 6
Offset:
Bit
98h
Attr
Default
Description
31:10
9:0
RV
000000h
3FFh
Reserved
RXINVSHFT: Receiver Inversion Shift Register.
RWST
14.8.2.8
SBFIBRXLNERR: SB Intel IBIST Receiver Lane Error Status
This records the error status from each lane.
Device:
NodeID
Function: 6
Offset:
Bit
9Ch
Attr
Default
Description
31:10
9:0
RV
000000h
000h
Reserved
RXERRSTAT: Receiver Error Status
ROST
234
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.8.2.9
SBFIBPATTBUF2: SB Intel IBIST Pattern Buffer 2 Register
This optional register contains the pattern bits used in Intel IBIST operations. Only the
least significant 24 bits are used. This user specified pattern goes out on to the link
with the least-significant 12 bits as the first frame and the most significant 12 bits as
the second frame.
Device:
NodeID
Function: 6
Offset:
Bit
A0h
Attr
Default
Description
31:24
23:0
RV
00h
Reserved
RWST
fd3302h
IBPATBUF2: IBIST Pattern Buffer 2
Pattern buffer storing the default and the user programmable pattern.
Default: fd3302h
14.8.2.10 SBFIBPATT2EN: SB Intel IBIST Pattern Buffer 2 Enable
This optional register specifies which lanes will carry the pattern specified in
SBFIBPATTBUFF2.
Device:
NodeID
Function: 6
Offset:
Bit
A4h
Attr
Default
Description
31:10
9:0
RV
00h
Reserved
RWST
000h
SBFIBPATT2EN: IBIST Pattern Buffer 2 enable
Per lane enable for driving pattern buffer 2.
14.8.2.11 SBFIBINIT: SB Intel IBIST Initialization Register
This register control southbound Intel IBIST Testing.
Device:
NodeID
Function: 6
Offset:
Bit
B0h
Attr
Default
Description
31
RV
0
Reserved
30:21
RWST
0c8h
SBTS0CNT: Southbound TS0 Count
Number of TS0 sequences to transmit.
20:13
RWST
01h
SBTS1CNT: Southbound TS1 Count
Number of TS1 sequences to transmit.
If TS1CNT[7] = 1; (TS1CNT >= 128) Intel IBIST will loop forever
If TS1CNT[7] = 0; (TS1CNT <128) Intel IBIST will loop TS1CNT
times
12:3
2
RWST
RWST
100h
1
SBDISCNT: Southbound Disable State Count
Number of cycles to remain in disable state.
SBCALIBEN: Southbound Calibration Enable
1 - Perform FBD Calibration.
1
0
RV
0
0
Reserved
RWST
SBIBISTINITEN: IBIST Initialization Enable
1 - Start IBIST Testing with Southbound Transmitter as the host.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
235
Registers
14.8.2.12 SBIBISTMISC: SB Intel IBIST Initialization Miscellaneous Register
This register control southbound Intel IBIST Testing.
Device:
NodeID
Function: 6
Offset:
Bit
B4h
Attr
Default
00h
Description
31:
RV
Reserved
23:20
19:0
RWST
RWST
0h
AMBID: Value of the AMB ID field during TS0
61a80h
SBIBISTCALPERIOD: Number of cycles to drive 1 during
Calibration
14.8.3
Northbound FBD Intel IBIST Registers
14.8.3.1
NBFIBPORTCTL: Northbound FBD Intel IBIST Port Control Register
This register controls the operation of the Intel IBIST logic.
Device:
NodeID
Function: 6
Offset:
Bit
C0h
Attr
Default
Description
31:24
23
RV
00h
0
Reserved
RWST
SBNBMAP: Loopback mapping bit
This bit will be sent during TS1 to specify to the slave which lanes needs to be
looped back. Actual lanes looped back is specified in the FBD Architecture Spec.
22
RWST
0
CMMSTR: Compliance Measurement Mode start
This puts the Intel IBIST logic in CMM mode and Intel IBIST TX engine will start
transmitting Intel IBIST patterns.
21:12
11:8
RWCST
ROST
000h
0h
ERRCNT: Error Counter
Total number of frames with errors that were encountered by this port.
ERRLNNUM: Error Lane Number
This points to the first lane that encountered an error. If more than one lane
reports an error in a cycle, the most significant lane number that reported the
error will be logged.
7:6
RWCST
00
ERRSTAT: Port Error Status
When Intel IBIST is started, status goes to 01 until first start delimiter is
received and then goes to 00 until the end or to10 if an error occurs.
00: No error.
01: Did not receive first start delimiter.
10: Transmission error (first error).
11: Reserved
5
RWST
0
AUTOINVSWPEN: Auto Inversion sweep enable
This bit enables the inversion shift register to continuously rotate the pattern in
the FIBTXSHFT and FIBRXSHFT registers.
0: Disable Auto-inversion
1: Enable Auto-inversions
4
3
RWST
RWST
0
0
STOPONERR: Stop IBIST on Error
0: Do not stop on error, only update error counter
1: Stop on error
LOOPCON: Loop forever
0: No looping
1: Loop forever
236
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
Device:
NodeID
Function: 6
Offset:
C0h
Bit
Attr
Default
Description
2
RWCST
0
COMPLETE: IBIST done flag
0: Not done
1: Done
1
0
RWST
RWST
0
0
MSTRMD: Master Mode Enable
When this bit is set along with IBISTR, the Intel IBIST transmit engine is
enabled to transmit Intel IBIST patterns.
0: Disable Master mode.
1: Enable master mode.
IBISTR: IBIST Start
When set, Intel IBIST starts transmitting after the TS1 header is recognized
during the next link initialization sequence. and MSTRMD bit is set.This bit also
enables the receive engine to start looking for the start delimiter during TS1
training set. This bit is reset when Intel IBIST receiver is done. The Intel IBIST
transmit and receive engines can be stopped by setting this bit to 0.
0: Stop IBIST transmitter
1: Start IBIST transmitter
14.8.3.2
NBFIBPGCTL: NB Intel IBIST Pattern Generator Control Register
This register contains bits to control the operation of the Intel IBIST pattern generator.
All counts are in 24 bit increments.
Device:
NodeID
Function: 6
Offset:
Bit
C4h
Attr
Default
Description
OVRLOOPCNT: Overall Loop Count
31:26 RWST
0Fh
0h: Reserved
1h-3Fh: Number of times to loop all the patterns.
25:21 RWST
00h
CNSTGENCNT: Constant Generator Loop Counter
00h: Disable constant generator output
01h: 1Fh The number of times the constant generator counter pattern should loop
before going to the next component. Each count represents 24 bits of 1’s or 0’s.
20
RWST
0
CNSTGENSET: Constant Generator Setting
0: Generate 0
1: Generate 1
19:13 RWST
12:10 RWST
0Fh
MODLOOPCNT: Modulo-N Loop Counter
Each count represents 24 bits of the pattern specified by MODPERIOD.
00h: Disable Pattern Output
01h: 7Fh The number of times the Pattern Buffer should loop before going to the
next component.
001b
MODPERIOD: Period of the Modulo-N counter
Each encoding transmits a 24-bit pattern as specified below. All other encodings are
reserved.
001: L/2 - 0101_0101_0101_0101_0101_0101
010: L/4 - 0011_0011_0011_0011_0011_0011
011: L/6 - 0001_1100_0111_0001_1100_0111
100: L/8 - 0000_1111_0000_1111_0000_1111
110: L/24 - 0000_0000_0000_1111_1111_1111
9:3
RWST
0Fh
PATTLOOPCNT: Pattern Buffer Loop Counter
00h: Disable Pattern Output
01h: 7Fh The number of times the Pattern Buffer (IBPATTBUF) should be repeated
before going to the next component.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
237
Registers
Device:
NodeID
Function: 6
Offset:
C4h
Bit
Attr
Default
Description
PTGENORD: Pattern Generation Order
2:0
RWST
000
000: Pattern Store + Modulo N Cntr + Constant Generator
001: Pattern Store + Constant Generator + Modulo N Cntr
010: Modulo N Cntr + Pattern Store + Constant Generator
011: Modulo N Cntr + Constant Generator + Pattern Store
100: Constant Generator + Pattern Store + Modulo N Cntr
101: Constant Generator + Modulo N Cntr + Pattern Store
110: Reserved
111: Reserved
14.8.3.3
NBFIBPATTBUF1: NB Intel IBIST Pattern Buffer 1 Register
This register contains the pattern bits used in Intel IBIST operations. Only the least
significant 24 bits are used. This user specified pattern goes out on to the link with the
least-significant 12 bits as the first frame and the most significant 12 bits as the second
frame.
Device:
NodeID
Function: 6
Offset:
Bit
C8h
Attr
Default
Description
31:24
23:0
RV
00h
Reserved
RWST
02ccfdh
IBPATBUF: IBIST Pattern Buffer
Pattern buffer storing the default and the user programmable pattern.
14.8.3.4
NBFIBTXMSK: NB Intel IBIST Transmitter Mask Register
This register enables Intel IBIST operations for individual lanes. This mask only applies
to transmitters and not receivers.
Device:
NodeID
Function: 6
Offset:
Bit
CCh
Attr
Default
Description
31:14
13:0
RV
00000h
3FFFh
Reserved
TXMASK: Selects which channels to enable for testing.
RWST
14.8.3.5
NBFIBRXMSK: NB Intel IBIST Receiver Mask Register
This register enables Intel IBIST operations for individual lanes. This mask only applies
to receivers and not transmitters.
Device:
NodeID
Function: 6
Offset:
Bit
D0h
Attr
Default
Description
31:14
13:0
RV
00000h
3FFFh
Reserved
RXMASK: Selects which channels to enable for testing.
RWST
238
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
14.8.3.6
NBFIBTXSHFT: NB Intel IBIST Transmitter Inversion Shift Register
Each bit in this register enables inverting the patterns that is driven on corresponding
lanes. If AUTOINVSWPEN bit is set in port control register, the TXINVSHFT field is
rotated left at the completion of each pattern buffer set.
Device:
NodeID
Function: 6
Offset:
Bit
D4h
Attr
Default
Description
31:14
13:0
RV
00000h
3FFFh
Reserved
TXINVSHFT: Transmitter Inversion Shift Register.
RWST
14.8.3.7
NBFIBRXSHFT: NB Intel IBIST Receiver Inversion Shift Register
Each bit in this register enables inverting the patterns that is received on corresponding
lanes. If AUTOINVSWPEN bit is set in port control register, the RXINVSHFT field is
rotated left at the completion of each pattern buffer set.
Device:
NodeID
Function: 6
Offset:
Bit
D8h
Attr
Default
Description
31:14
13:0
RV
00000h
3FFFh
Reserved
RXINVSHFT: Receiver Inversion Shift Register.
RWST
14.8.3.8
NBFIBRXLNERR: NB Intel IBIST Receiver Lane Error Status
This records the error status from each lane.
Device:
NodeID
Function: 6
Offset:
Bit
DCh
Attr
Default
Description
31:14
13:0
RV
00000h
0000h
Reserved
RXERRSTAT: Receiver Error Status
ROST
14.8.3.9
NBFIBPATTBUF2: NB Intel IBIST Pattern Buffer 2 Register
This optional register contains the pattern bits used in Intel IBIST operations. Only the
least significant 24 bits are used. This user specified pattern goes out on to the link
with the least-significant 12 bits as the first frame and the most significant 12 bits as
the second frame.
Device:
NodeID
Function: 6
Offset:
Bit
E0h
Attr
Default
Description
31:24
23:0
RV
00h
Reserved
RWST
fd3302h
IBPATBUF2: IBIST Pattern Buffer 2
Pattern buffer storing the default and the user programmable pattern.
Intel® 6400/6402 Advanced Memory Buffer Datasheet
239
Registers
14.8.3.10 NBFIBPATT2EN: NB Intel IBIST Pattern Buffer 2 Enable
This optional register specifies which lanes will carry the pattern specified in
NBFIBPATTBUFF2.
Device:
NodeID
Function: 6
Offset:
Bit
E4h
Attr
Default
Description
15:14
13:0
RV
00
Reserved
RWST
0000h
IBPATBUF2EN: IBIST Pattern Buffer 2 enable
Per lane enable for driving pattern buffer 2.
14.8.3.11 NBFIBINIT: NB Intel IBIST Initialization Register
This register control northbound Intel IBIST Testing.
Device:
NodeID
Function: 6
Offset:
F0h
Bit
Attr
Default
Description
31
RWST
0
SBIDLE: SB Link is not active
This is to enable the NB link to complete training when there is no activity on
the SB side. Normally NB waits for SB init to complete before proceeding with
its training.
0 - Wait for SB
1 - Do not wait for SB
30:21 RWST
20:13 RWST
0c8h
01h
NBTS0CNT: Northbound TS0 Count
Number of TS0 sequences to transmit.
NBTS1CNT: Northbound TS1 Count
Number of TS1 sequences to transmit.
If TS1CNT[7] = 1; (TS1CNT >= 128) Intel IBIST will loop forever
If TS1CNT[7] = 0; (TS1CNT <128) Intel IBIST will loop TS1CNT times
12:3
RWST
RWST
100h
NBDISCNT: Northbound Disable State Count
Number of cycles to remain in disable state.
2
1
1
0
NBCALIBEN: Northbound Calibrating Enable
1 - Perform FBD Calibration.
RV
Reserved
0
RWST
0
NBIBISTINITEN: IBIST Initialization Enable
1 - Start IBIST Testing with Northbound Transmitter as the host.
14.8.3.12 NBIBISTMISC: NB Intel IBIST Initialization Miscellaneous Register
This register control northbound Intel IBIST Testing.
Device:
NodeID
Function: 6
Offset:
F4h
Attr
RV
Bit
Default
00h
Description
31
Reserved
23:20 RWST
19:0 RWST
0h
AMBID: Value of the AMB ID field during TS0
61a80h
NBIBISTCALPERIOD: Number of cycles to drive 1 during Calibration
240
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Registers
The upper bits of this register read the raw values of four of the DIFF fuses. The values
are undefined until the fuses are burned. However the values of DIFF[49:46] used by
other logic are forced to zeros while the FUSELCK fuse is zero. Therefore these four
fuse values only have affect after the fuses have been locked. There are “chicken bits”
which allow the bits to be controlled before the fuses are locked.
§
Intel® 6400/6402 Advanced Memory Buffer Datasheet
241
Registers
242
Intel® 6400/6402 Advanced Memory Buffer Datasheet
SPD Bits
15 SPD Bits
15.1
Access Mechanisms
The tables in this section contain the Intel recomendations for the SPD bits that will be
pulled from the DIMM’s non-volital RAM and programmed into the Intel 6400/6402
Advanced Memory Buffer (AMB) component. This is done by the BIOS when required.
There is a table for each of the raw cards that the DIMM can be based on.
15.1.1
Raw Cards A, B, and C
Table 15-1. Raw Cards A, B, and C (Sheet 1 of 2)
C0 Stepping
D1 Stepping
Byte 533MHz 667MHz 533MHz 667MHz
Description
FBD channel Protocols Supported
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x54
0x6E
0x60
0x9A
0x78
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x67
0x7F
0x6E
0xAA
0x86
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x52
0x66
0x60
0x84
0x6A
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x56
0x40
0x36
0x30
0x60
0x7A
0x6E
0xA1
0x7F
0x00
0x00
0x00
0x00
0x00
0x00
B2B Access Turnaround Bubble (assumes at tCK)
CMD2DATA (800)
CMD2DATA (667)
CMD2DATA (533)
TR AMB (free air JEDEC)
AMB DT Idle_0
AMB DT Idle_1
AMB DT Idle_2
AMB DT Active_1
AMB DT Active_2
AMB DT L0s
reserved (TR DRAM)
reserved (TR AMB)
reserved (TR DRAM2AMB)
reserved (TR AMB2DRAM)
Tjmax
See Category-Byte Table for values
Reserved
100 0x00
101 0x80
102 0x20
103 0x00
104 0x44
105 0x00
106 0x80
0x00
0x80
0x20
0x00
0x44
0x00
0x80
0x00
0x80
0x20
0x00
0x44
0x04
0x80
0x00
0x80
0x20
0x00
0x44
0x04
0x80
AMB Personality Bytes PRE-INIT
Intel® 6400/6402 Advanced Memory Buffer Datasheet
243
SPD Bits
Table 15-1. Raw Cards A, B, and C (Sheet 2 of 2)
C0 Stepping
D1 Stepping
Byte 533MHz 667MHz 533MHz 667MHz
Description
AMB Personality Bytes POST-INIT
107 0x40
108 0x53
109 0x00
110 0x00
111 0x65
112 0x4C
113 0x00
114 0x05
115 0x80
116 0x89
150 0x00
151 0x08
0x40
0x53
0x00
0x00
0x65
0x4C
0x00
0x05
0x80
0x89
0x00
0x08
0x48
0x53
0x33
0x40
0x65
0x4C
0x00
0x10
0x80
0x89
0x01
0x09
0x48
0x53
0x33
0x40
0x65
0x4C
0x00
0x10
0x80
0x89
0x01
0x09
AMB Manufacturer JEDEC ID
informal AMB content revision tag (MSB)
informal AMB content revision tag (LSB)
15.1.2
Raw Cards D, E, H, and J
Table 15-2. Raw Cards D, E, H, and J
C0 Stepping
D1 Stepping
Byte
533 MHz
667 MHz 533 MHz 667 MHz
Description
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
0x02
0x00
0x10
0x58
0x42
0x38
0x30
0x5E
0x76
0x60
0xA6
0x84
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x58
0x42
0x38
0x30
0x71
0x89
0x6E
0xB6
0x92
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x58
0x42
0x38
0x30
0x5B
0x71
0x60
0x92
0x71
0x00
0x00
0x00
0x00
0x00
0x00
0x02
0x00
0x10
0x58
0x42
0x38
0x30
0x6A
0x84
0x6E
0xAF
0x8B
0x00
0x00
0x00
0x00
0x00
0x00
FBD channel Protocols Supported
B2B Access Turnaround Bubble (assumes at tCK)
CMD2DATA (800)
CMD2DATA (667)
CMD2DATA (533)
TR AMB (free air JEDEC)
AMB DT Idle_0
AMB DT Idle_1
AMB DT Idle_2
AMB DT Active_1
AMB DT Active_2
AMB DT L0s
reserved (TR DRAM)
reserved (TR AMB)
reserved (TR DRAM2AMB)
reserved (TR AMB2DRAM)
Tjmax
See catecategory-Byte Table for values
Reserved
0x00
0x00
0x00
0x00
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
SPD Bits
Table 15-2. Raw Cards D, E, H, and J
C0 Stepping
D1 Stepping
Byte
533 MHz
667 MHz 533 MHz 667 MHz
Description
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
150
151
0x80
0x20
0x00
0x44
0x03
0x80
0x48
0x53
0x00
0x00
0x65
0x4C
0x00
0x05
0x80
0x89
0x00
0x08
0x80
0x20
0x00
0x44
0x03
0x80
0x48
0x53
0x00
0x00
0x65
0x4C
0x00
0x05
0x80
0x89
0x00
0x08
0x80
0x20
0x00
0x44
0x04
0x80
0x48
0x53
0x31
0x40
0x65
0x4C
0x00
0x10
0x80
0x89
0x01
0x09
0x80
0x20
0x00
0x44
0x04
0x80
0x48
0x53
0x31
0x40
0x65
0x4C
0x00
0x10
0x80
0x89
0x01
0x09
AMB Personality Bytes PRE-INIT
AMB Personality Bytes POST-INIT
AMB Manufacturer JEDEC ID
informal AMB content revision tag (MSB)
informal AMB content revision tag (LSB)
15.1.3
Category Byte 99
Table 15-3. Category ByteJ
Raw Card airflow impedance*
DRAM type
Heat Spreader type
Byte 99
binary hex
value
[7:6]
00
00
00
00
00
00
00
00
00
00
00
00
Value
planar
[5:3]
001
001
001
001
001
001
011
011
Value
[2:0]
001
010
001
010
001
010
001
010
001
010
001
010
A
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
unknown
AMB only
Full DIMM
AMB only
Full DIMM
AMB only
Full DIMM
AMB only
Full DIMM
AMB only
Full DIMM
AMB only
Full DIMM
b00001001 0x09
b00001010 0x0A
b00001001 0x09
b00001010 0x0A
b00001001 0x09
b00001010 0x0A
b00011001 0x19
b00011010 0x1A
b00010001 0x11
b00010010 0x12
b00001001 0x09
b00001010 0x0A
A
planar
planar
planar
planar
planar
stacked
stacked
B
B
C
C
D/J
D/J
D/J
D/J
E/H
E/H
dual die 010
dual die 010
planar
planar
001
001
Note:
*Airflow Impedance value is the result of air flow resistance measurements and bin
bands defined by FBDIMM customers
(Contact your customer for measurement method/setup if you want to program known
air flow impedance values otherwise program to the b00 default.)
Intel® 6400/6402 Advanced Memory Buffer Datasheet
245
SPD Bits
§
246
Intel® 6400/6402 Advanced Memory Buffer Datasheet
Glossary
A Glossary
A.1
Terms and Definitions
Term
Definition
ADC
Analog to Digital Converter
Advanced Memory Buffer
Autonomous Platform Manager
Automatic Test Equipment
Built-In Self-Test
AMB
APM
ATE
BIST
BL4/BL8
CAS
DRAM Burst Length 4/8
Column Address Strobe
Chip Boot Configuration
CBC
Chip disable
An ECC encoding specifically tailored for memory such that the data from any
defective memory device can be reconstructed from some aggregate of
surviving memory devices. Corrects data from failed device. The AMB employs
an “x8” ECC, which means that all data from a partially or completely failed 8-bit
device can be recovered without stopping the system. This same ECC provides
the same level of coverage for 4-bit (“x4”) devices.
CRC
Cyclic Redundancy Code(s). Usually in reference to binary error detection
algorithms.
CSR
Configuration and Status Register(s)
Double Data Rate (SDRAM)
DDR
DDR Branch
The minimum aggregation of DDR channels which operate in lock-step to
support error correction. Two channels per branch supports x8 chip disable ECC.
A rank spans a branch.
DDR Channel
A DDR channel consists of a data channel with 72 bits of data and an ADDR/
CNTRL channel
DDR Data channel
A DDR data channel consists of 72 bits of data, divided into 18 data groups
Each data group consists of 4 data signals and a differential strobe pair
Design for Test/Manufacturability/Validation
DDR Data group
DFx
DFV
Design For Validation
DIMM
Dual In-Line Memory Module. A packaging arrangement of memory devices on a
socketable substrate.
DIMM Slot
Receptacle (socket) for a DIMM. Also, the relative physical location of a specific
DIMM on a DDR channel.
DIMM Stack
Dual-ranked x4 DRAM DIMM physical topology: refers to two physical rows of
DRAM “stacked” one above another
DLL
Delay locked loop
DPM
Defects per million
DRAM
Dynamic Random Access Memory
The DRAM cells selected by the Row Address
Error Correction Code. For the AMB, this is a chip disable code.
Electrically Erasable Programmable Read Only Memory
Error Mask
DRAM Page (Row)
ECC
EEPROM
EMask, EMASK
Intel® 6400/6402 Advanced Memory Buffer Datasheet
247
Glossary
Term
Definition
EM
Electromagnetic
EMI
FBD
Electromagnetic interference
Fully-Buffered DIMM
FBD Channel
Combination of 10 lane Southbound Links and 13 or 14 lane Northbound Links
that make up a logical memory channel from host perspective
FBDIMM
FERR
FIFO
Frame
FSM
Fully-Buffered DIMM
First Error
First-In, First-Out. Usually in reference to a buffer implementation.
Group of bits containing commands or data
Finite State Machine
HCSL
Host
High-speed Current Steering Logic
Memory controller agent on an FBD channel
Interconnect Built-In Self-Test (built-in interconnect test)
Input Output. Usually in reference to a bidirectional buffer cell or circuit.
Inter Symbol Interference – see section “Initialization / Clocking” for definition
IBIST
I/O
ISI
JEDEC
JEDEC Solid State Technology Association (once known as the Joint Electron
Device Engineering Council)
JESD79
JTAG
JEDEC Standard 79, DDR SDRAM Specification
Joint Test Action Group. Usually in reference to the IEEE 1149.1a boundary scan
test standard.
LA
Logic Analyzer
LAI
Logic Analyzer Interface
Lane
LFSR
Differential pair of receivers or transmitters
Linear Feedback Shift Register. Usually in reference to pseudo-random bit-
stream data.
Link
High speed parallel Differential Point-to-Point interface
Memory interface Control (block)
MC
MemBIST
Mesochronous
MTBF
Memory Built-In Self-Test
Small ppm frequency difference.
Mean Time Between Failures
MT/s
Mega Transfers per Second
NACK
Not-ACKnowledge. Usually in reference to SMBus communications.
Northbound
NB
NBI
Northbound Interface. (also: Northbound link control logic)
Next/Subsequent Error
NERR
Northbound
ODT
The direction of signals running from the furthest DIMM toward the host.
On-Die Termination
Page Replace aka Page
Miss, Row Hit / Page Miss
An access to a row that has another page open. The page must be transferred
back from the sense amps to the array, and the bank must be precharged.
Page Hit
An access to an open page, or DRAM row. The data can be supplied from the
sense amps at low latency.
Page Miss (Empty Page)
An access to a page that is not buffered in sense amps and must be fetched
from DRAM array.
PEC
Packet Error Code
Plesiochronous
PLL
Having the same frequency but arbitrary phase differences.
Phase Locked Loop
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
Glossary
Term
Definition
POR
Plan Of Record
Primary
PTH
In the direction towards the Host controller
Plated Through-Hole
PVT
Process, Voltage and Temperature
Rank
A DIMM is organized as one or two physical sets of memory, called ranks. Note
that single rank or dual rank is different from single-sided or double-sided, for
example, a single rank DIMM build from x4 DRAM devices is actually double-
sided. It is also common practice to distribute the 9 devices of an x8 DIMM
between both sides of the DIMM to enhance the thermal performance of the
module. The standard 4-slot DDR2 topology is limited to single rank DIMM due
to loading constraints.
RAS
Reliability, Availability, Serviceability. (also: Row Address Strobe - meaning is
context dependent.)
Resample
A resampler is a serial data in and serial data out node that attenuates jitter by
regenerating the serial data using a clock recovered from the incoming data
stream derived from a common reference clock. It also resets the voltage
budget of the retransmitted data.
Resync
A resync repeater is a serial data in and serial data out node that resynchronizes
data to a local clock after it has been sampled with a recovered clock derived
from a common reference clock. The local clock is also generated from the same
reference clock by a PLL multiplier. A drift compensation buffer is inserted
between the two clock domains which absorbs the maximum link delay change
over worst case voltage and temperature changes. Both the jitter and voltage
budgets for the retransmitted data are reset.
RPD
Return Path Discontinuity
SB
Southbound
SBI
Southbound Interface. (also: Southbound link control logic)
Single Data Rate
SDR
SDRAM
Secondary
Synchronous Dynamic Random Access Memory
In the direction away from the Host controller
Seed, SEED
The starting or “seed” value used to algorithmically generate pseudo-random
data. Usually in reference to a LFSR implementation.
Serial Present Detect (aka
SMBus protocol
A 2-signal serial bus used to read and write control registers in the AMB and
SDRAM
SI
Signal Integrity
SMBus, SMBUS
System Management Bus. Mastered by a system management controller to read
and write configuration registers. Limited to 100 kHz.
Southbound
SPD
The direction of signals running from the host controller toward the DIMMs.
Serial Presence Detect. Usually in reference to the serial ROM on a socketable
DIMM which contains information specific to the unit.
SPOF
Single Point Of Failure
SSC
Spread Spectrum Clocking. Usually used to lower average EM emissions.
Simultaneously Switching Outputs
SSO
SSTL_18
Throttled
Series Stub Terminated Logic for 1.8 V
Temporarily prohibiting memory accesses when a thermal or electrical limit has
been reached.
Transparent Mode
High speed FBD linked I/Os are bypassed with lower speed CMOS I/Os to allow
lower speed tester to control and test DRAMs on the DIMM.
Unit Interval
VCO
Average time interval between voltage transitions of a signal
Voltage Controlled Oscillator
V
V
I/O buffer voltage for DDR2 buffers. Nominally 1.8 V
Ground (0.0 V)
DDQ
SS
Intel® 6400/6402 Advanced Memory Buffer Datasheet
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Glossary
§
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Intel® 6400/6402 Advanced Memory Buffer Datasheet
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