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AM79C970A

PCnet™-PCI II Single-Chip Full-Duplex Ethernet Controller for PCI Local Bus Product

Advanced Micro Devices 

7), which is hardwired to ONE. The PCnet-PCI II con-

troller is capable of detecting an I/O or a memory

mapped I/O cycle even when its address phase imme-

diately follows the data phase of a transaction to a dif-

ferent target, without any idle state in-between. There

will be no contention on the DEVSEL, TRDY and STOP

signals, since the PCnet-PCI II controller asserts

DEVSEL on the second clock after FRAME is asserted

(medium timing).

CLK

1

2

3

4

5

6

7

8

9

10

11

FRAME

AD

ADDR

DATA

C/BE

0010

BE

PAR

PAR

PAR

IRDY

TRDY

DEVSEL

STOP

Figure 3. Slave Read Using I/O Command

19436C-6

28

Am79C970A

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