AM79C973KCW Advanced Micro Devices, AM79C973KCW Datasheet - Page 92

• Manufacturer Part Number: AM79C973KCW
• Description: PCnet-FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
• Manufacturer: Advanced Micro Devices

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