AM79C976 Advanced Micro Devices, AM79C976 Datasheet - Page 58
AM79C976
Manufacturer Part Number
AM79C976
Description
PCnet-PRO 10/100 Mbps PCI Ethernet Controller
Manufacturer
Advanced Micro Devices
Datasheet
1.AM79C976.pdf
(309 pages)
- Current page: 58 of 309
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P R E L I M I N A R Y
If a receive buffer does not end on a DWord boundary,
the Am79C976 controller will perform a non-DWord
write on the last transfer to the buffer. Figure 27 shows
CLK
the final three FIFO DMA transfers to a receive buffer.
1
2
3
4
5
6
Since there were only 9 bytes of space left in the re-
FRAME
ceive buffer, the Am79C976 controller bursts three data
phases. The first two data phases write a full DWord,
the last one only writes a single byte.
ADD
AD
DATA
DATA
DATA
C/BE
0111
0001
0000
PAR
PAR
PAR
PAR
IRDY
TRDY
DEVSEL
REQ
GNT
DEVSEL is sampled
22929B28
58
Am79C976
8/01/00
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