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AM79C976 Fiches technique(PDF) 46 Page - Advanced Micro Devices

No de pièce AM79C976
Description  PCnet-PRO??10/100 Mbps PCI Ethernet Controller
PDF  309 Pages
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Fabricant  AMD [Advanced Micro Devices]
Site Internet  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C976 Fiches technique(HTML) 46 Page - Advanced Micro Devices

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46
Am79C976
8/01/00
P R E L I M INARY
)LJXUH'LVFRQQHFW :LWK'DWD 7UDQVIHU
'LVFRQQHFW:LWKRXW'DWD 7UDQVIHU
Figure 16 shows a target disconnect sequence during
which no data is transferred. STOP is asserted on clock
4 without TRDY being asserted at the same time. The
Am79C976 controller terminates the access with the
deassertion of FRAME on clock 5 and of IRDY one
clock cycle later. It finally releases the bus on clock 7.
The Am79C976 controller will again request the bus
after two clock cycles to retry the last transfer. The
starting address of the new transfer will be the address
of the last non-transferred data.
FRAME
CLK
AD
IRDY
TRDY
C/BE
DEVSEL
REQ
GNT
PAR
DEVSEL is sampled
ADDRi
0000
0111
PAR
0111
2
3456789
11
10
PAR
DATA
STOP
ADDRi+8
DATA
1
22929B17



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