AM79C970A Advanced Micro Devices, AM79C970A Datasheet - Page 39

• Manufacturer Part Number: AM79C970A
• Description: PCnet-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product
• Manufacturer: Advanced Micro Devices

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