WED3C755E8M-300BM [ETC]
Microprocessor ; 微处理器\n
| 型号： | WED3C755E8M-300BM |
| 厂家： | 
ETC |
| 描述： | Microprocessor
|
| 文件： | 总13页 (文件大小：378K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
WED3C755E8M-XBX
RISC Microprocessor Multichip Package
OVERVIEW
The WED3C755E8M-XBX is offered in Commercial
(0°C to +70°C), industrial (-40°C to +85°C) and mili-
tary (-55°C to +125°C) temperature ranges and is
well suited for embedded applications such as mis-
siles, aerospace, flight computers, fire control sys-
tems and rugged critical systems.
The WEDC 755E/SSRAM multichip package is tar-
geted for high performance, space sensitive, low
power systems and supports the following power
management features: doze, nap, sleep and dynamic
power management.
*This data sheet describes a product that is subject to change without notice.
The WED3C755E8M-XBX multichip package con-
sists of:
FEATURES
• 755 RISC processor (E die revision)
n Footprint compatible with WED3C7558M-XBX and
WED3C750A8M-200BX
• Dedicated 1MB SSRAM L2 cache, configured as
128Kx72
n Footprint compatible with Motorola MPC 745
• 21mmx25mm, 255 Ceramic Ball Grid Array (CBGA)
• Core Frequency/L2 Cache Frequency (300MHz/
150MHz, 350MHz/175MHz)
• Maximum 60x Bus frequency = 66MHz
FIGꢀ 1 MULTI-CHIP PACKAGE DIAGRAM
E
1
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September 2002 Revꢀ 0
WED3C755E8M-XBX
FIGꢀ 2 Block Diagram
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2
WED3C755E8M-XBX
FIGꢀ 3 BLOCK DIAGRAM, L2 INTERCONNECT
SSRAM 1
L20Vdd
U1
L2pin_DATA
L2pin_DATA
L2pin_DATA
L2pin_DATA
L2DP0-3
DQa
FT
SBd
SBc
SBb
SBa
SW
DQb
DQc
DQd
DP0-3
ADSP
ADV
SE2
L2 CLK_OUT A
L2WE
K
SGW
SE1
L2CE
ADSC
SE3
LBO
SA0-16
ZZ
G
A0-16
µP
SSRAM 2
755
E
L20Vdd
U2
SA0-16
FT
SBd
SBc
SBb
SBa
SW
ADSP
ADV
SGW
SE1
K
L2CLK_OUT B
L2pin_DATA
L2pin_DATA
L2pin_DATA
L2pin_DATA
L2DP4-7
DQa
DQb
DQc
DQd
SE2
ADSC
SE3
LBO
G
DP0-3
ZZ
L2ZZ
FIGꢀ 4 BLOCK DIAGRAM, L2 INTERCONNECT
TDI
L2 Cache
SSRAM
U1
L2 Cache
STDI
STDO
755
E
SSRAM
U2
TDO
TMS TCK TRST
STMS STCK
3
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WED3C755E8M-XBX
FIGꢀ 5 PIN ASSIGNMENTS
Ball assignments of the 255 CBGA package as viewed from the top surface.
Side profile of the CBGA package to indicate the direction of the top surface view.
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WED3C755E8M-XBX
PACKAGE PINOUT LISTING
Signal Name
Pin Number
Active
I/O
I/F Voltage
C16, E4, D13, F2, D14, G1, D15, E2, D16, D4, E13, G2, E15, H1, E16, H2, F13, J1, F14,
High
I/O
OVdd
A[0-31]
AACK
ABB
J2, F15, H3, F16, F4, G13, K1, G15, K2, H16, M1, J15, P1
L2
Low
Low
High
Low
—
Input
I/O
OVdd
OVdd
OVdd
OVdd
2.0V
K4
AP[0-3]
ARTRY
AVDD
C1, B4, B3, B2
I/O
J4
I/O
A10
—
BG
L1
Low
Low
High
Low
Low
Low
—
Input
Output
Input
Output
Input
Ouput
Output
I/O
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
BR
B6
BVSEL (4, 5, 6)
CI
B1
E1
CKSTP_IN
CKSTP_OUT
CLK_OUT
DBB
D8
A6
D7
J14
Low
Low
Low
Low
High
DBG
N1
Input
Input
Input
I/O
DBDIS
H15
DBWO
G4
P14, T16, R15, T15, R13, R12, P11, N11, R11, T12, T11, R10, P9, N9, T10, R9, T9, P8,
DH[0-31]
N8, R8, T8, N7, R7, T7, P6, N6, R6, T6, R5, N5, T5, T4
K13, K15, K16, L16, L15, L13, L14, M16, M15, M13, N16, N15, N13, N14, P16, P15,
High
I/O
OVdd
DL[0-31]
DP[0-7]
DRTRY
GBL
R16, R14, T14, N10, P13, N12, T13, P3, N3, N4, R3, T1, T2, P4, T3, R4
M2, L3, N2, L4, R1, P2, M4, R2
High
Low
Low
—
I/O
Input
I/O
OVdd
OVdd
OVdd
GND
G16
F1
GND
C5, C12, E3, E6, E8, E9, E11, E14, F5, F7, F10, F12, G6, G8, G9, G11, H5, H7, H10, H12,
—
J5, J7, J10, J12, K6, K8, K9, K11, L5, L7, L10, L12, M3, M6, M8, M9, M11, M14, P5, P12
HRESET
A7
Low
Low
High
High
—
Input
Input
Input
Input
—
OVdd
OVdd
—
INT
B15
L1_TSTCLK (1)
L2_TSTCLK (1)
L2AVDD (8)
L2OVDD
L2VSEL (4, 5, 6, 7)
LSSD_MODE (1)
MCP
D11
D12
—
L11
2.0V
E10, E12, M12, G12, G14, K12, K14
—
—
L20Vdd
L20Vdd
—
B5
High
Low
Low
—
Input
Input
Input
—
B10
C13
OVdd
—
NC (No-connect)
OVDD (2)
PLL_CFG[0-3]
QACK
C3, C6, D5, D6, H4, A4, A5, A2, A3
C7, E5, G3, G5, K3, K5, P7, P10, E7, M5, M7, M10
—
—
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
OVdd
L20Vdd
L20Vdd
L20Vdd
A8, B9, A9, D9
High
Low
Low
Low
Low
Low
—
Input
Input
Output
Output
Input
Input
Input
Input
Output
D3
QREQ
J3
RSRV
D1
SMI
A16
B14
B7
SRESET
STCK (9)
STDI
C8
—
STDO
J16
—
5
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WED3C755E8M-XBX
PACKAGE PINOUT LISTING (CONTINUED)
Signal Name
STMS (10)
SYSCLK
TA
Pin Number
Active
—
I/O
I/F Voltage (7)
L2OVDD
OVDD
OVDD
OVDD
OVDD
OVDD
OVDD
OVDD
B8
Input
Input
Input
Input
I/O
C9
—
H14
Low
High
Low
High
High
High
Low
Low
High
Low
Low
High
High
Low
—
TBEN
C2
TBST
A14
TCK
C11
Input
Input
Output
Input
Input
Input
Input
I/O
TDI (6)
TDO
A11
A12
TEA
H13
OVDD
OVDD
OVDD
OVDD
OVDD
OVDD
TLBISYNC
TMS (6)
TRST (6)
TS
C4
B11
C10
J13
TSIZ[0-2]
TT[0-4]
WT
A13, D10, B12
Output
I/O
B13, A15, B16, C14, C15
D2
OVDD
OVDD
Output
—
VDD (2)
VOLDET (3)
F6, F8, F9, F11, G7, G10, H6, H8, H9, H11, J6, J8, J9, J11, K7, K10, L6, L8, L9
F3
2.0V
—
Output
—
NOTES:
1. These are test signals for factory use only and must be pulled up to OVDD for normal machine operation.
2. OVDD inputs supply power to the I/O drivers and Vdd inputs supply power to the processor core.
3. Internally tied to GND in the BGA package to indicate to the power supply that a low-voltage processor is present. This signal is not a power supply pin.
4. To allow processor bus I/0 voltage changes, provide the option to connect BVSEL and L2VSEL independently to either OVDD (Selects 3.3V Interface) or to
GND (Selects 2.0V Interface).
5. Uses one of 15 existing no-connects in WEDC’s WED3C750A8M-200BX.
6. Internal pull up on die.
7. OVDD supplies power to the processor bus, JTAG, and all control signals except the L2 cache controls (L2CE, L2WE, and L2ZZ); L2OVDD supplies
power to the L2 cache I/O interface (L2ADDR (0-16], L2DATA (0-63), L2DP{0-7] and L2SYNC-OUT) and the L2 control signals and the SSRAM power supplies;
and Vdd supplies power to the processor core and the PLL and DLL (after filtering to become AVDD and L2AVDD respectively). This column serves as a
reference for the nominal voltage supported on a given signal as selected by the BVSEL/L2VSEL pin configurations and the voltage supplied. For actual
recommended value of Vin or supply voltages see Recommended Operating Conditions Table.
8. Uses one of 20 existing Vdd pins in WEDC's WED3C750A8M-200BX, no board level design changes are necessary. For new designs of WED3C7558M-XBX
refer to PLL power supply filtering.
9. To disable SSRAM TAP controllers without interfering with the normal operation of the devices, STCK should be tied low (GND) to prevent clocking the
devices.
10. STDI and STMS are internally pulled up and may be left unconnected. Upon power-up the SSRAM devices will come up in a reset state which will not
interfere with the operation of the device.
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WED3C755E8M-XBX
ABSOLUTE MAXIMUM RATINGS
Characteristic
Symbol
Vdd
Value
Unit
V
Notes
(4)
Core supply voltage
PLL supply voltage
L2 DLL supply voltage
60x bus supply voltage
L2 bus supply voltage
Input supply
-0.3 to 2.5
AVdd
L2AVDD
OVdd
L2OVdd
Vin
-0.3 to 2.5
V
(4)
-0.3 to 2.5
V
(4)
-0.3 to 3.6
V
(3)
-0.3 to 3.6
V
(3)
Processor Bus
L2 bus
-0.3 to 0Vdd +0.3
-0.3 to L20Vdd +0.3
-0.3 to 3.6
V
(2)
Vin
V
(2)
JTAG Signals
Vin
V
(2)
Storage temperature range
Tstg
-55 to 150
°C
NOTES:
1. Functional and tested operating conditions are given in Operating Conditions table. Absolute maximum ratings are stress ratings only, and
functional operation at the maximums is not guaranteed. Stresses beyond those listed may affect device reliability or cause permanent damage
to the device.
2. Caution: Vin must not exceed OVdd by more than 0.3V at any time including during power-on reset.
3. Caution: OVdd/L2OVDD must not exceed Vdd/AVdd/L2AVdd by more than 1.6 V at any time including during power-on reset.
4. Caution: Vdd/AVdd/L2AVDD must not exceed L2OVdd/OVdd by more than 0.4 V at any time including during power-on reset.
RECOMMENDED OPERATING CONDITIONS
Recommended
Characteristic
Core supply voltage
PLL supply voltage
L2 DLL supply voltage
Processor bus supply
voltage
Symbol
Vdd
Value
Unit
2.0 100mV
2.0 100mV
2.0 100mV
2.5 125mV
3.3 165mV
3.3 165mV
GND to OVdd
GND to OVdd
V
V
V
V
V
V
V
V
AVdd
L2AVdd
BVSEL = 1
OVdd
L2 bus supply voltage
Input Voltage
L2VSEL = 1
Processor bus
JTAG Signals
L20Vdd
Vin
Vin
NOTE:
These are the recommended and tested operating conditions. Proper device operation outside of these conditions is not guaranteed
7
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WED3C755E8M-XBX
POWER CONSUMPTION
VDD=AVDD=2ꢀ0±0ꢀ1V, OVDD=3ꢀ3V ±5% VDC, GND=0 VDC, 0£TJ<105°C
Processor (CPU) Frequency/L2 Frequency
300/150 MHz
350/175MHz
Unit
W
Notes
1, 3
Full-on Mode
Typical
4.1
6.7
4.6
7.9
Maximum
Maximum
Maximum
Maximum
Maximum
W
1, 2
Doze Mode
2.5
2.8
W
1, 2
Nap Mode
1700
1200
500
1800
1300
500
mW
mW
mW
1, 2
Sleep Mode
1, 2
Sleep Mode–PLL and DLL Disabled
1, 2
NOTES:
1. These values apply for all valid 60x bus and L2 bus ratios. The values do not include OVdd; AVdd and L2AVdd suppling power. OVdd power is
system dependent, but is typically <10% of Vdd power. Worst case power consumption, for AVdd=15mW and L2AVdd=15mW.
2. Maximum power is measured at Vdd=2.1V while running an entirely cache-resident, contrived sequence of instructions which keep the execution
units maximally busy.
3. Typical power is an average value measured at Vdd=AVdd=L2AVdd=2.0V, OVdd=L2OVdd=3.3V in a system, executing typical applications and
benchmark sequences.
L2 CACHE CONTROL REGISTER (L2CR)
The L2 cache control register, shown in Figure 5, is a supervisor-level, implementation-specific SPR used to configure and
operate the L2 cache. It is cleared by hard reset or power-on reset.
FIGꢀ 5 L2 CACHE CONTROL REGISTER (L2CR)
L2WT
L2DF
L2BYP
L2CS
L2IO L2DRO
L2PE
L2DO
L2CTL L2TS
L2SL
L2IP
L2E
L2SIZ
L2CLK
L2RAM
L2I
L20H
0
0
L2CTR
0
1
2
3
4
6
7
8
9
10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
30 31
The L2CR bits are described in Table 1.
Reserved
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WED3C755E8M-XBX
TABLE 1: L2CR BIT SETTINGS
Bit
Name
Function
0
L2E
L2 enable. Enables L2 cache operation (including snooping) starting with the next transaction the L2 cache unit receives. Before
enabling the L2 cache, the L2 clock must be configured through L2CR[2CLK], and the L2 DLL must stabilize. All other L2CR bits must
be set appropriately. The L2 cache may need to be invalidated globally.
1
L2PE
L2 data parity checking enable. Enables parity generation and checking for the L2 data RAM interface. When disabled, generated
parity is always zeros. L2 Parity is supported by WEDC’s WED3C755E8M-XBX, but is dependent on application.
2–3
L2SIZ
L2 size—Should be set according to the size of the L2 data RAMs used.
11
1 Mbyte - Setting for WED3C755E8M-XBX
4–6
L2CLK
L2 clock ratio (core-to-L2 frequency divider). Specifies the clock divider ratio based from the core clock frequency that the
L2 data RAM interface is to operate at. When these bits are cleared, the L2 clock is stopped and the on-chip DLL for the L2
interface is disabled. For nonzero values, the processor generates the L2 clock and the on-chip DLL is enabled. After the L2 clock
ratio is chosen, the DLL must stabilize before the L2 interface can be enabled. The resulting L2 clock frequency cannot be slower
than the clock frequency of the 60x bus interface.
000 L2 clock and DLL disabled
001 ¸ 1
010 ¸ 1.5
011 Reserved
100 ¸ 2
101 ¸ 2.5
110 ¸ 3
111 Reserved
7–8
L2RAM
L2DO
L2 RAM type—Configures the L2 RAM interface for the type of synchronous SRAMs used:
• Pipelined (register-register) synchronous burst SRAMs that clock addresses in and clock data out
The 755 does not burst data into the L2 cache, it generates an address for each access.
10 Pipelined (register-register) synchronous burst SRAM - Setting for WED3C755E8M-XBX
9
L2 data only. Setting this bit enables data-only operation in the L2 cache. For this operation, instruction transactions from the L1 Instruction
cache already cached in the L2 cache can hit in the L2, but new instruction transactions from the L1 instruction cache are treated as
cache-inhibited (bypass L2 cache, no L2 checking done). When both L2DO adn L2IO are set, the L2 cache is effectively locked (cache
misses do not cause new entries to be allocated but write hits use the L2).
10
11
L2I
L2 global invalidate. Setting L2I invalidates the L2 cache globally by clearing the L2 status bits. This bit must not be set while the L2
cache is enabled. See Motorola’s User manual for L2 Invalidation procedure.
L2CTL
L2 RAM control (ZZ enable). Setting L2CTL enables the automatic operation of the L2ZZ (low-power mode) signal for cache RAMs.
Sleep mode is supported by the WED3C755E8M-XBXꢀ While L2CTL is asserted, L2ZZ asserts automatically when the device
enters nap or sleep mode and negates automatically when the device exits nap or sleep mode. This bit should not be set when the
device is in nap mode and snooping is to be performed through deassertion of QACK.
12
13
L2WT
L2TS
L2 write-through. Setting L2WT selects write-through mode (rather than the default write-back mode) so all writes to the L2 cache also write
through to the system bus. For these writes, the L2 cache entry is always marked as exclusive rather than modified. This bit must never be
asserted after the L2 cache has been enabled as previously-modified lines can get remarked as exclusive during normal operation.
L2 test support. Setting L2TS causes cache block pushes from the L1 data cache that result from dcbf and dcbst instructions to be
written only into the L2 cache and marked valid, rather than being written only to the system bus and marked invalid in the L2 cache
in case of hit. This bit allows a dcbz/dcbf instruction sequence to be used with the L1 cache enabled to easily initialize the L2 cache
with any address and data information. This bit also keeps dcbz instructions from being broadcast on the system and single-beat
cacheable store misses in the L2 from being written to the system bus.
0: Setting for the L2 Test support as this bit is reserved for testsꢀ
L2 output hold. These bits configure output hold time for address, data, and control signals driven to the L2 data RAMs.
00: Least Hold Time - Setting for WED3C755E8M-XBX
14–15
L2OH
9
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WED3C755E8M-XBX
TABLE 1: L2CR BIT SETTINGS
Bit
Name
Function
16
L2SL
L2 DLL slow. Setting L2SL increases the delay of each tap of the DLL delay line. It is intended to increase the delay through the DLL to
accommodate slower L2 RAM bus frequencies.
0: Setting for WED3C755E8M-XBX because L2 RAM interface is operated above 100 MHz.
L2 differential clock. This mode supports the differential clock requirements of late-write SRAMs.
0: Setting for WED3C755E8M-XBX because late-write SRAMs are not used.
L2 DLL bypass is reserved.
17
18
L2DF
L2BYP
0: Setting for WED3C755E8M-XBX
19-20
21
—
Reserved. These bits are implemented but not used; keep at 0 for future compatibility.
L2IO
L2 Instruction-only. Setting this bit enables instruction-only operation in the L2 cache. For this operation, data transactions from the L1 data cache
already cached in the L2 cache can hit in the L2 (including writes), but new data transactions (transactions that miss in the L2) from the L1 data
cashe are treated as cache-inhibited (bypass L2 cache, no L2 checking done). When both L2DO and L2IO are set, the L2 cache is effectively
locked (cache misses do not cause new entries to be allocated but write hits use the L2). Note that this bit can be programmed dynamically.
22
23
L2CS
L2 Clock Stop. Setting this bit causes the L2 clocks to the SRAMs to automatically stop whenever the MPC755 enters nap or sleep modes, and
automatically restart when exiting those modes (including for snooping during nap mode). It operates by asynchronously gating off the
L2CLK_OUT [A:B] signals while in nap or sleep mode. The L2SYNC_OUT/SYNC_IN path remains in operation, keeping the DLL synchronized. This
bit is provided as a power-saving alternative to the L2CTL bit and its corresponding ZZ pin, which may not be useful for dynamic stopping/
restarting of the L2 interface from nap and sleep modes due to the relatively long recovery time from ZZ negation that the SRAM requires.
W
L2DRO
L2 DLL rollover. Setting this bit enables a potential rollover (or actual rollover) condition of the DLL to cause a checkstop for the processor.
A potential rollover condition occurs when the DLL is selecting the last tap of the delay line, and thus may risk rolling over to the first tap with
one adjustment while in the process of keeping synchronized. Such a condition is improper operation for the DLL, and, while this condition is
not expected, it allows detection for added security. This bit can be set when the DLL is first enabled (set with the L2CLK bits) to detect
rollover during initial synchronization. It could also be set when the L2 cache is enabled (with L2E bit) after the DLL has achieved its initial lock.
24–30
31
L2CTR
L2IP
L2 DLL counter (read-only). These bits indicate the current value of the DLL counter (0 to 127). They are asynchronously read when the L2CR is
read, and as such should be read at least twice with the same value in case the value is asynchronously caught in transition. These bits are
intended to provide observability of where in the 128-bit delay chain the DLL is at any given time. Generally, the DLL operation should be
considered at risk if it is found to be within a couple of taps of its beginning or end point (tap 0 or tap 128).
L2 global invalidate in progress (read only)—See the Motorola user’s manual for L2 Invalidation procedure.
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WED3C755E8M-XBX
In addition, CKSTP_OUT is an open-drain style output that re-
quires a pull-up resistor (1 kW-5 kW) if it is used by the system.
PLL POWER SUPPLY FILTERING
The AVDD and L2AVDD power signals are provided on the
WED3C755E8M-XBX to provide power to the clock gen-
eration phase-locked loop and L2 cache delay-locked loop
respectively. To ensure stability of the internal clock, the
power supplied to the AVDD input signal should be filtered
of any noise in the 500kHz to 10 MHz resonant frequency
range of the PLL. A circuit similar to the one shown in Figure
6 using surface mount capacitors with minimum Effective
Series Inductance (ESL) is recommended. Multiple small
capacitors of equal value are recommended over a single
large value capacitor. The circuit should be placed as close
as possible to the AVDD pin to minimize noise coupled
from nearby circuits. An identical but separate circuit should
be placed as close as possible to the L2AVDD pin. It is often
possible to route directly from the capacitors to the AVDD
pin, which is on the periphery of the 255 BGA footprint,
without the inductance of vias. The L2AVDD pin may be
more difficult to route but is proportionately less critical.
During inactive periods on the bus, the address and transfer
attributes may not be driven by any master and may, therefore,
float in the high-impedance state for relatively long periods of
time. Since the processor must continually monitor these sig-
nals for snooping, this float condition may cause additional
power draw by the input receivers on the processor or by
other receivers in the system. These signals can be pulled up
through weak (10 kW) pull-up resistors by the system or may
be otherwise driven by the system during inactive periods of
the bus to avoid this additional power draw, but address bus
pull-up resistors are not neccessary for proper device opera-
tion. The snooped address and transfer attribute inputs are:
A[0:31], AP[0:3], TT[0:4], TBST, and GBL.
The data bus input receivers are normally turned off when
no read operation is in progress and, therefore, do not
require pull-up resistors on the bus. Other data bus receiv-
ers in the system, however, may require pull-ups, or that
those signals be otherwise driven by the system during
inactive periods by the system. The data bus signals are:
DH[0:31], DL[0:31], and DP[0:7].
PULL-UP RESISTOR REQUIREMENTS
The WED3C755E8M-XBX requires pull-up resistors (1 kW-5
kW) on several control pins of the bus interface to maintain
the control signals in the negated state after they have been
actively negated and released by the processor or other bus
masters. These pins are TS, ABB, AACK, ARTRY, DBB, DBWO,
TA, TEA, and DBDIS. DRTRY should also be connected to a
pull-up resistor (1 kW-5 kW) if it will be used by the system;
otherwise, this signal should be connected to HRESET to
select NO-DRTRY mode.
If 32-bit data bus mode is selected, the input receivers of
the unused data and parity bits will be disabled, and their
outputs will drive logic zeros when they would otherwise
normally be driven. For this mode, these pins do not re-
quire pull-up resistors, and should be left unconnected by
the system to minimize possible output switching.
If address or data parity is not used by the system, and the
respective parity checking is disabled through HID0, the
input receivers for those pins are disabled, and those pins
do not require pull-up resistors and should be left uncon-
nected by the system. If all parity generation is disabled
through HID0, then all parity checking should also be dis-
abled through HID0, and all parity pins may be left uncon-
nected by the system.
Three test pins also require pull-up resistors (100 W-1 kW).
These pins are L1_TSTCLK, L2_TSTCLK, and LSSD_MODE.
These signals are for factory use only and must be pulled
up to OVDD for normal machine operation.
FIGꢀ 6 POWER SUPPLY FILTER CIRCUIT
10 Ω
Vdd
AVdd (or L2AVdd)
2.2 µF
2.2 µF
Low ESL surface mount capacitors
GND
11
White Electronic Designs Corporation (602) 437-1520 wwwꢀwhiteedcꢀcom
WED3C755E8M-XBX
PACKAGE DESCRIPTION
Package Outline
Interconnects
Pitch
21x25mm
255 (16x16 ball array less one)
1.27mm
3.90mm
0.8mm
Maximum module height
Ball diameter
PACKAGE DIMENSIONS 255 BALL GRID ARRAY
TOP VIEW
BOTTOM VIEW
T
R
P
N
M
L
K
J
H
G
F
E
D
C
B
A
1ꢀ 2ꢀ 3ꢀ 4ꢀ 5ꢀ 6ꢀ 7ꢀ 8ꢀ 9ꢀ 10ꢀ11ꢀ12ꢀ13ꢀ14ꢀ15ꢀ16
NOTES:
1. Dimensions in millimeters and paranthetically in inches.
2. A1 corner is designated with a ball missing the array.
White Electronic Designs Corporation Phoenix AZ (602) 437-1520
12
WED3C755E8M-XBX
ORDERING INFORMATION
WED 3 C 755E 8M X B X
DEVICE GRADE:
M = Military Screened
-55°C to +125°C
-40°C to +85°C
0°C to +70°C
I = Industrial
C = Commercial
PACKAGE TYPE:
B = 255 Ceramic Ball Grid Array
CORE FREQUENCY (MHz)
350 = 350MHz/175MHz L2 cache
300 = 300MHz/150MHz L2 cache
L2 CACHE DENSITY:
8Mbits = 128K x 72 SSRAM
PowerPC™:
Type 755E - 'E' Die Revision (2ꢀ8)
C = MULTICHIP PACKAGE
3 = PowerPC™
WHITE ELECTRONIC DESIGNS CORP9
PowerPCÔ is a trademark of International Business Machine Corp.
13
White Electronic Designs Corporation (602) 437-1520 wwwꢀwhiteedcꢀcom
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