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AM79C978VC/W 数据表(PDF) 39 Page - Advanced Micro Devices

部件名 AM79C978VC/W
功能描述  Single-Chip 1/10 Mbps PCI Home Networking Controller
PDF  261 Pages
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制造商  AMD [Advanced Micro Devices]
网页  http://www.amd.com
标志 AMD - Advanced Micro Devices

AM79C978VC/W 数据表(HTML) 39 Page - Advanced Micro Devices

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Am79C978
39
Figure 6.
Slave Write Using Memory Command
Expansion ROM Transfers
Since the Am79C978 device does not have expansion
ROM capabilities, PCI configuration offset must be set
to 30H = 0.
During the boot procedure, the system will try to find an
Expansion ROM. A PCI system assumes that an Ex-
pansion ROM is present when it reads the ROM signa-
ture 55H (byte 0) and AAH (byte 1).
Slave Cycle Termination
There are three scenarios besides normal completion
of a transaction where the Am79C978 controller is the
target of a slave cycle and it will terminate the access.
Figure 7.
Expansion ROM Read
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
STOP
PAR
ADDR
0111
PAR
1
2345678
10
9
11
DATA
PAR
BE
22206B-9
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
STOP
PAR
ADDR
CMD
PAR
1
2345
48
49
50
51
DATA
PAR
BE
DEVSEL
is sampled
22206B-10



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