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AM79C970AVCW Datasheet(PDF) 49 Page - Advanced Micro Devices

Part # AM79C970AVCW
Description  PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
PDF  219 Pages
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Manufacturer  AMD [Advanced Micro Devices]
Direct Link  http://www.amd.com
Logo AMD - Advanced Micro Devices

AM79C970AVCW Datasheet(HTML) 49 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
49
Am79C970A
Disconnect Without Data Transfer
The figure below 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 PCnet-PCI II 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 6. The PCnet-PCI II controller will re-request the
bus after 2 clock cycles to retry the last transfer. The
starting address of the new transfer will be the address
of the last untransferred data.
19436A-21
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
REQ
GNT
PAR
DEVSEL is sampled
ADDRi
0000
0111
PAR
0111
1
2345678
10
9
STOP
ADDRi
DATA
PAR
Figure 18. Disconnect Without Data Transfer



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