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AM79C976 Datasheet(PDF) 55 Page - Advanced Micro Devices

Part # AM79C976
Description  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 Datasheet(HTML) 55 Page - Advanced Micro Devices

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8/01/00
Am79C976
55
P R E L I M INARY
Table 5. Descriptor Write Sequence
Note: Figure 24 assumes that the Am79C976 control-
ler is programmed to use 32-bit software structures
(SWSTYLE = 2, 3, 4, or 5). The byte enable signals for
the second data transfer would be 0111b, if the device
was programmed to use 16-bit software structures
(SWSTYLE = 0).
SWSTYLE
BCR20[7:
0]
AD Bus Sequence
for Rx Descriptor
AD Bus Sequence
for Tx Descriptor
0
Address = XXXX
XX04h
Data
Idle
Address = XXXX
XX00h
Data
Address = XXXX
XX04h
Data
Idle
Address = XXXX
XX00h
Data
2
Address = XXXX
XX08h
Data
Idle
Address = XXXX
XX04h
Data
Address = XXXX
XX08h
Data
Idle
Address = XXXX
XX04h
Data
3
Address = XXXX
XX00h
Data
Data
Address = XXXX
XX00h
Data
Data
4
Address = XXXX
XX00h
Data
Address = XXXX
XX00h
Data
5
Address = XXXX
XX00h
Data
Address = XXXX
XX00h
Data



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