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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
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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.
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Plug and Play Register Settings Stored in External Low Cost E PROM.
• PCMCIA Interface
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PC Card 95 Compatible
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Two CIS Storage Options:
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• CIS stored in Serial E PROM and Downloaded At Runtime to Internal Dual Port RAM
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• 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., 2004. All rights reserved.
1996 All Rights Reserved.