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Supports PCI and CardBus interfaces
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Supports an unlimited PCI burst
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Supports PCI clock speed frequency from dc to 33 MHz; network operation with
PCI clock from 20 MHz to 33 MHz
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Supports automatic loading of subvendor ID and CardBus card information
structure (CIS) pointer from serial ROM to configuration registers
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Supports full-duplex operation on both MII/SYM and 10BASE-T ports
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Provides MicroWire interface for serial ROM (1K and 4K EEPROM)
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Supports three network ports: 10BASE-T (10 Mb/s), AUI (10 Mb/s), and MII/
SYM (10/100 Mb/s)
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Supports IEEE 802.3 and ANSI 8802-3 Ethernet standards
For more information about the 21143, refer to the Digital Semiconductor 21143
PCI/CardBus 10/100-Mb/s Ethernet LAN Controller Data Sheet and the Digital
Semiconductor 21143 PCI/CardBus 10/100-Mb/s Ethernet LAN Controller Hard-
ware Reference Manual.
3.2.6 PCI- Ultra SCSI (Fast-20) I/O Processor Chip
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Performs wide high-speed SCSI bus transfers in single-ended and differential
mode up to 40 MB/s synchronous Ultra SCSI (Fast-20) transfers and 14 MB/s
asynchronous transfers
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SCRIPTS Instruction Prefetch
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536-byte buffer allows burst length of up to 128 transfers
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Load and Store instruction
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4 KB static RAM for SCRIPTS instruction storage
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32 additional Scratchpad registers for user-defined functions
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Designed to provide a smooth migration path from existing Fast SCSI designs
•
Builds upon proven SCSI technologya pin-for-pin replacement for the wide
SCSI industry standard SYM53C825 and SYM53C825A
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Provides new features for enhanced PCI performance and flexibility
Digital Semiconductor 21174 Core Logic Chip
Functional Description
3–7
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