M68LC302CPU16VCT [NXP]

4 CHANNEL(S), 10Mbps, LOCAL AREA NETWORK CONTROLLER, PQFP100, 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-100;


型号：	M68LC302CPU16VCT
厂家：	NXP
描述：	4 CHANNEL(S), 10Mbps, LOCAL AREA NETWORK CONTROLLER, PQFP100, 14 X 14 MM, 1.40 MM HEIGHT, 0.50 MM PITCH, PLASITC, LQFP-100 时钟局域网数据传输外围集成电路
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MC68SC302P/D

Freescale Semiconductor

MC68SC302

Product Brief

Passive ISDN Protocol Engine

The MC68SC302 Passive ISDN Protocol Engine (PIPE) is a communication controller optimized for ISDN

passive cards, with an ISA PNP interface and a PCMCIA slave interface. The MC68SC302 is a descendant of

the popular MC68302 Integrated Multiprotocol Processor. The microcoded RISC communications processor

from the 68302 was modified to form the core of the 68SC302. The 68000 core and many related system

integration features were removed to further optimize the device for passive ISDN card applications. The serial

communication channels (SCC) have been optimized for supporting a full ISDN basic rate interface. The three

SCCs support two 64kbit per second B-channels and one 16kbit per second D-channel. The 68SC302 connects

gluelessly to Motorola’s MC145572 U transceiver or MC145574 S/T transceiver and, as an added bonus,

eliminates the need for a second oscillator for the transceiver chip.

MC68SC302 KEY FEATURES

• ISA Bus Interface

—

ISA Plug and Play Interface

Glueless Connections to ISA

24mA Buffers for ISA Bus Pins

Full Support of Plug and Play Standard

All Chip Registers Accessed from ISA Bus.

Support for 8- or 16-bit I/O or Memory ISA Cycles

11 Selectable Interrupt Output Pins to ISA Bus.

Additional Chip Select Allows Another Device to Be Accessed from the ISA Bus.

Plug and Play Register Settings Stored in External Low Cost E PROM.

• PCMCIA Interface

—

PC Card 95 Compatible

—

Two CIS Storage Options:

• CIS stored in Serial E PROM and Downloaded At Runtime to Internal Dual Port RAM

• CIS Optionally Stored in Parallel E PROM on the PC Card Bus with Dedicated Chip Select, Saving

Dual Port RAM Buffer Space and Always Available for PC Accesses.

This document contains information on a product under development. Freescale reserves the right to change or discontinue this product without notice.

Freescale Semiconductor, Inc.

—

Memory Mode Accesses Supported (I/O Not Supported)

Supports 8- or 16-bit Memory Cycles

Supports Ring Detect through Status Change Pin

Additional Chip Select Allows Another Device to be Address Mapped on the PC Card Bus.

• ISDN Communications Processor

—

Requires No External (Local) RAM

Flexible Channel Handling

RISC Processor Decreases CPU Load with Flexible Buffer Descriptor Structure and HDLC

Capability (UART Mode Not Supported).

—

Totally Independent Programming for Rx/Tx for each of the B and D Channels

Supports Any Sub-Channeling for Each of the B Channels

Enables a Concatenation of 2 B Channels (or Any Selected Bits) to a Super-Channel

HDLC with Retry Capability for the D Channel

Allows Dynamic Connection/Disconnection for each of the B Channels

Total 1536KB Dual Port RAM Divided into Parameter and Data Buffer RAM

256 Byte Parameter RAM (As in PM302)

1280 Byte Data RAM with Efficient FIFO Organization and Flexible Buffer Size

Independent Programmable Channel FIFO Length, if Split Equally:

• 4 x 256 Bytes FIFO for B1 and B2 Channel (Rx/Tx)

• 2 x 64 Bytes FIFO for D Channel (Rx/Tx)

—

Glueless Interface to Freescale and Other Popular ISDN S/T and U Interface Chips

Supports Freescale Interchip Digital Link (IDL)

Supports General Circuit Interface (GCI), Also Known as IOM-2

Includes Serial Communication Port (SCP) for Synchronous Communication

Includes one SMC That Can Support Both the C/I and Monitor Channel of GCI

Two Strobes Support Time-Slot Assignment of Non-Intelligent Peripherals

Only One Crystal Required for TA Application.

Clock Output (CLKO) Generation from a Crystal. CLKO Can Be Connected to S/T XTAL Input.

Clock Input for U-Chip (MC145572) can be Used to Drive SC302

IOM-2 is a trademark of Siemens AG

MC68SC302 PRODUCT INFORMATION

For More Information On This Product,

Go to: www.freescale.com

Freescale Semiconductor, Inc.

• Other System Integration Features

—

Gluelessly Connects to Serial E PROM via SCP Port for PNP ISA ID and CIS Storage.

25XXX Series or 93XX Series E PROMs Supported.

Flexible Pin Configuration Allows Trade-Offs between 16-Bit Wide ISA/PC Card Interface and Extra

I/O Pins.

• Up to 16 Parallel I/O Pins for Controlling Other Functions.

On-Chip Interrupt Controller

—

• 8 Internal Interrupt Sources

• 7 External Pin Sources for External Devices.

2 Low-Power Modes

• Wait - Oscillator Keeps Running ~5 mA

• Stop - Oscillator Stops - <100uA

—

Operating Speed: 0-20.48 Mhz

Operating Voltage: 5V

100 pin TQFP (14mm x 14mm)

MC68SC302 OVERVIEW

The block diagram for the MC68SC302 is shown in Figure 1. The MC68SC302 architecture is based on a

microcoded RISC communications processor that services the three main high speed serial channels (SCC),

two serial management channels (SMC) and a serial communications port (SCP). The three SCC channels

support simultaneous operation of the three channels specified by the ISDN basic rate interface (2B+D). Each

SCC can support onboard HDLC processing as well as totally transparent operation. The dual-port RAM

provides 1536 bytes of memory. A maximum of 1280 bytes can be allocated for serial channel buffer space,

which, when allocated evenly for a basic rate interface, allows 256 bytes per B channel per direction and 64

bytes per direction for the D channel. This provides 32msec worth of basic rate data to be stored in the buffers,

allowing ample interrupt latency time for host platform operating systems. The IDL or GCI interface provides

direct connection to the Freescale MC145572 U interface transceiver, the MC145574 S/T interface transceiver,

and other popular ISDN transceivers. A non-multiplexed serial interface (NMSI) is also provided for SCC2.

The MC68SC302 has an ISA Plug and Play interface which supports the ISA Plug and Play specification

version 1.0a. The ISA bus interface can be configured for either I/O mode accesses or memory mode

accesses. The ISA interface can be either an 8- or 16-bit wide data bus allowing pin usage trade-offs to be

made. I/O mode accesses are based on a self-incrementing pointer, allowing the PC to write or read data from

a fixed ISA I/O address. Memory mode access allows the PC to write or read data into a predefined ISA

window. In addition to supporting access to the internal MC68SC302 register and memory map, an additional

chip-select is provided for an external device, and can be programmed for either memory or I/O and either 8

or 16 bit bus independent of internal space.

The MC68SC302 can also be configured to provide a PC Card interface based on the PC Card 95

specification. Either 8- or 16-bit wide memory cards can be implemented. There are two options available for

supporting the Card Information Structure (CIS): 1)The CIS can be stored in external serial EEPROM which is

downloaded on reset into the Dual Port RAM (DPRAM) space. 2) To save DPRAM space, the CIS can be

MC68SC302 PRODUCT INFORMATION

For More Information On This Product,

Go to: www.freescale.com

Freescale Semiconductor, Inc.

stored in a parallel EEPROM on the external PCMCIA bus. An additional chip select is provided to support

access to an external device from the PC Card interface.

The MC68SC302 also has up to 12 general purpose I/O pins to connect to external circuits. Five external chip

interrupts can be brought in and routed through a built-in interrupt controller to any one of 11 ISA interrupts (or

to the PC Card interface interrupt). The MC68SC302 can be clocked at the same rate as the physical layer

transceiver clock which eliminates the need for a dedicated oscillator or crystal.

PIO AND INTERRUPT PINS

PIO AND INT I/F

ISA PnP/

PCMCIA

ISA PnP

1536 BYTE

RAM

INTERFACE

COMMUNICATIONS

PROCESSOR

PCMCIA

INTERFACE

SCC1

SCC2

2 SMCs

SCP

SCC3

IDL/GCI INTERFACE

NMSI I/F

SCP/E²PROM INTERFACE

NMSI PINS

IDL/GCI PINS

Figure 1. MC68SC302 Block Diagram

REFERENCE DESIGNS

Figure 2 shows the 68SC302 in an NT1 terminal adaptor (TA) application using the MC68SC302. The TA

supports a basic rate interface (BRI). The 68SC302 is connected gluelessly to the ISA bus connector and

performs the Plug and Play interface using the serial EEPROM for storage of non-volatile Plug and Play data.

Data and control accesses from the PC to the MC68SC302 can be selectively memory or I/O mapped. Only

one clock source (crystal or oscillator) is needed for a simple terminal adaptor.

MC68SC302 PRODUCT INFORMATION

For More Information On This Product,

Go to: www.freescale.com

Freescale Semiconductor, Inc.

20.048 MHZ

SERIAL

EEPROM

IDL OR GCI BUS

145572 U

MC68SC302

20.048 MHZ CLOCK

I/F

LINE I/F

ISA BUS

Figure 2. Passive NT Terminal Adaptor Block Diagram

Figure 3 shows a basic rate terminal adaptor with the 4-wire S/T interface. This architecture is almost identical

to the U interface TA with the exception that the TA clock source is provided to the S/T transceiver from the

MC68SC302.

SERIAL

EEPROM

IDL OR GCI BUS

145574 S/T

MC68SC302

15.36 MHZ CLOCK

I/F

LINE I/F

15.36 MHZ

ISA BUS

Figure 3. Passive TE Terminal Adaptor Block Diagram with S/T Interface

Figure 4 shows a more full featured terminal adaptor. The two added features are the “Plain Old Telephone”

(POTs) interface and a optional modem datapump. Up to two POTs interfaces can be added on the board to

support simultaneous B channel voice call. The ISA interface provides a separate chip select for an external

data pump which uses an MC145480 to produce an 8khz PCM output that can be directly connected to the

IDL or GCI bus.

MC68SC302 PRODUCT INFORMATION

For More Information On This Product,

Go to: www.freescale.com

Freescale Semiconductor, Inc.

20.048 MHZ

SERIAL

EEPROM

20.048 MHZ CLOCK

145572 U

MC68SC302

IDL OR GCI BUS

I/F

LINE I/F

PIO

POTS

I/F

DATAPUMP

MC145480

ISA BUS

Figure 4. NT Terminal Adaptor Block Diagram with POTS Interface and Datapump

Figure 5 shows a PC Card terminal adaptor based on the SC302.

20.048 MHZ

SERIAL

EEPROM

IDL OR GCI BUS

20.048 MHZ CLOCK

145572 U

I/F

MC68SC302

PCMCIA

LINE I/F

Figure 5. PC Card Terminal Adaptor

ORDERING INFORMATION

FREQUENCY

TEMPERATURE

(MHZ)

PACKAGE TYPE

ORDER NUMBER

Surface Mount TQFP 100-Pin

(PU Suffix)

0°C to 70°C

20.048

MC68SC302PU20

M68LC302CPU16VCT [NXP]

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