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AM79C976 데이터시트(PDF) 58 Page - Advanced Micro Devices

부품명 AM79C976
상세설명  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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제조업체  AMD [Advanced Micro Devices]
홈페이지  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 데이터시트(HTML) 58 Page - Advanced Micro Devices

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58
Am79C976
8/01/00
P R E L I M INARY
)LJXUH  ),)2 %XUVW :ULWH $W 6WDUW 2I 8QDOLJQHG
%XIIHU
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
the final three FIFO DMA transfers to a receive buffer.
Since there were only 9 bytes of space left in the re-
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.
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
REQ
GNT
1
23456
0000
0111
PAR
PAR
PAR
DEVSEL is sampled
0001
PAR
DATA
DATA
DATA
ADD
22929B28



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