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AM79C975 bảng dữ liệu(PDF) 92 Page - Advanced Micro Devices

tên linh kiện AM79C975
Giải thích chi tiết về linh kiện  PCnet??FAST III Single-Chip 10/100 Mbps PCI Ethernet Controller with Integrated PHY
PDF  304 Pages
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nhà sản xuất  AMD [Advanced Micro Devices]
Trang chủ  http://www.amd.com
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AM79C975 bảng dữ liệu(HTML) 92 Page - Advanced Micro Devices

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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]
OE
CS
Am79C973
EPROM
AS_EBOE
21510D-46



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