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AM79C970A Datasheet(PDF) 39 Page - Advanced Micro Devices

Part # AM79C970A
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

AM79C970A Datasheet(HTML) 39 Page - Advanced Micro Devices

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P R E L I M I N A R Y
AMD
39
Am79C970A
Disconnect When Locked
When the PCnet-PCI II controller is locked by one
master and another master tries to access the control-
ler, the device will disconnect the access. When the
PCnet-PCI II controller is in the locked state and it sees
LOCK asserted together with FRAME, it knows that
another master tried to access it. The PCnet-PCI II con-
troller will respond to the access by asserting
STOP to-
gether with
DEVSEL while driving TRDY high, thereby
disconnecting the cycle.
STOP will stay asserted until
the other master removes
FRAME.
19436A-12
FRAME
CLK
AD
IRDY
TRDY
C/
BE
DEVSEL
STOP
1
23456
CMD
PAR
PAR
PAR
BE
DATA
ADDR
LOCK
Figure 9. Disconnect Of Slave Cycle When Locked



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