AM79C975VCW datasheet(92/304 Pages) AMD

部件名	AM79C975VCW

功能描述	PCnet??FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY

PDF	304 Pages

Scroll/Zoom	100%

制造商	AMD [Advanced Micro Devices]

网页	http://www.amd.com

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92 / 304 page

Am79C973/Am79C975

P R E L I M INARY

Am79C975 controller will not react to any access to the

Expansion ROM until both MEMEN (PCI Command reg-

ister, bit 1) and ROMEN (PCI Expansion ROM Base

Address register, bit 0) are set to 1. After the Expansion

ROM is enabled, the Am79C973/Am79C975 controller

will claim all memory read accesses with an address

between ROMBASE and ROMBASE + 1M - 4 (ROM-

BASE, PCI Expansion ROM Base Address register, bits

31-20). The address output to the Expansion ROM is

the offset from the address on the PCI bus to ROM-

BASE. The Am79C973/Am79C975 controller aliases all

accesses to the Expansion ROM of the command types

Memory Read Multiple and Memory Read Line to the

basic Memory Read command.

Figure 41. EPROM Only Configuration for the Expansion Bus (64K EPROM)

EBUA_EBA[7:0]

EBDA[15:8]

EBD[7:0]

EBWE

EROMCS

A[15:8]

A[7:0]

DQ[7:0]

Am79C973

EPROM

AS_EBOE

21510D-46

AM79C975VCW 数据表(PDF) 92 Page - Advanced Micro Devices