W89C940 Datasheet, PDF (28/61 Pages) Winbond – ELANC-PCI (TWISTED-PAIR ETHER-LAN CONTROLLER WITH PCI INTERFACE)

W89C940
CLK
1
2
3
4
5
6
7
8
FRAME#
IDSEL
AD[31::0]
C_BE[3:0]#
ADDRESS
BUS CMD
DATA
BE#'s
IRDY#
TRDY#
DEVSEL#
STOP#
PAR
The timing is the same as the figure I/O Read Transaction, except the IDSEL is asserted during the address
phase. The transaction access the configuration registers of the device.
Transaction Termination
Target Initiated Termination
The W89C940 device can only work in slave mode. It respond to the request from the master device and act as
a target. Sometimes the target are unable to answer the master device and initiate a termination. There are two
types of termination will occur. The first one is disconnect-C/Retry type. The second one is Target Abort type.
The timing is as shown in the figure
The first type is the Disconnect-C/Retry type, as shown in the figure
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