AM79C970AKCW AMD [Advanced Micro Devices], AM79C970AKCW Datasheet - Page 39
AM79C970AKCW
Manufacturer Part Number
AM79C970AKCW
Description
PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
Manufacturer
AMD [Advanced Micro Devices]
Datasheet
1.AM79C970AKCW.pdf
(219 pages)
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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
DEVSEL
FRAME
LOCK
TRDY
STOP
IRDY
C/BE
Figure 9. Disconnect Of Slave Cycle When Locked
CLK
PAR
AD
1
ADDR
CMD
P R E L I M I N A R Y
2
Am79C970A
PAR
3
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.
DATA
BE
4
PAR
5
6
AMD
19436A-12
39
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