AM79C973VCW AMD [Advanced Micro Devices], AM79C973VCW Datasheet - Page 92
AM79C973VCW
Manufacturer Part Number
AM79C973VCW
Description
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79C973VCW.pdf
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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-
92
Figure 41. EPROM Only Configuration for the Expansion Bus (64K EPROM)
Am79C973
EBUA_EBA[7:0]
EBDA[15:8]
AS_EBOE
EBD[7:0]
EROMCS
EBWE
P R E L I M I N A R Y
Am79C973/Am79C975
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.
A[15:8]
A[7:0]
DQ[7:0]
CS
OE
EPROM
21510D-46
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