
Preliminary W89C982AF
- 14 -
B2
0
0
0
0
1
1
1
1
B1
0
0
1
1
0
0
1
1
B0
0
1
0
1
0
1
0
1
TP PORT DISABLED
TP0
TP1
TP2
TP3
TP4
TP5
TP6
TP7
When a TP port is disabled, all inputs (the carrier sense) to that port will be ignored by the IMPR II
and the IMPR II will not transmit any signal on the port. The partition machine for the port will be
forced into the idle state and the link test will indicate that the port is in the "Link Fail" state.
Enable TP Port Link Test Function
This command is used to re-enable a link-test disabled TP port. Using this command on a TP port
that is already enabled will have no effect on the port.
Disable TP Port Link Test Function
The TP port link test function can be enabled or disabled port-by-port. Bits 0, 1, and 2 are used to
select which TP port is to be disabled in the manner described under the "Disable TP ports" command
above. Once the link test function is disabled, the TP port will not enter the link fail state.
Enable TP Port Auto Polarity Reversal Function
The auto polarity reversal function of the TP ports can be enabled or disabled port-by-port. Bits 0, 1,
and 2 are used to indicate which TP port is to be enabled, in the manner described under the "Disable
TP ports" command above. When the auto polarity reversal function is enabled, the TP port will
check the polarity of input packets once it enters the link fail state. This function is enabled by default
each time the IMPR II is reset.
Disable TP Port Auto Polarity Reversal Function
This command is used to disable the auto polarity reversal function of a TP port so that the port will
no longer check the polarity of input packets. If an input packet with reversed data is received, the
IMPR II will not correct the polarity and retransmit the packet to all the network ports. In this case,
failure to reverse the polarity may cause a network error.
Set AUI Port Alternative Reconnection Algorithm
The partition/reconnection scheme can be programmed for the alternative (transmit only)
reconnection algorithm using this command. To return the partition/reconnection logic of the AUI port
back to the standard reconnection (transmit or receive) algorithm, the IMPR II must be reset.
Set TP Port Alternative Reconnection Algorithm
The partition/reconnection scheme can be programmed for the alternative (transmit only)
reconnection algorithm using this command. To return the partition/reconnection logic of a TP port
back to the standard reconnection (transmit or receive) algorithm, the IMPR II must be reset.