Preliminary W89C982AF

Publication Release Date: November 1996

- 13 -

Revision A1

Read Bit Rate Error Status of TP Ports

The bit rate error status of the TP ports can be read using this command. Bits 0 through 7 correspond

to the polarity status of TP ports 0 through 7. A "1" on the MSO bit indicates that a bit rate error has

occurred and a "0" indicates no bit rate error has occurred.

Read MJLP Status

The MAU jabber lock-up protection status can be accessed using this command. A "1" on the MSB

indicates the transmit function of the IMPR II has been inhibited. The status can also be cleared using

this command.

Read AUI Port Status

The AUI port status, including partition, bit rate error, SQE test, and loopback error, can be accessed

using different variations of this command. Four different specific commands can be used, as shown

in the following table.

MSI DATA

MSO DATA

CLEAR BITS

10001111

PBSL0000

B, S, L read cleared. P not cleared.

10001011

PBSL0000

S, L read cleared. P, B not cleared.

10001101

PBSL0000

B read cleared. P, S, L not cleared.

10001001

PBSL0000

P, B, S, L not cleared.

Enable AUI Port

When disabled, the AUI port can be re-enabled using this command. The AUI port will then carry out

normal transmitting and receiving operations. To reconnect a partitioned AUI port, the port must first

be disabled and then re-enabled using this command.

Disable AUI Port

This command is used to disable the AUI port. When the AUI port is disabled, all inputs (the carrier

sense and the SQE) to the AUI port will be ignored by the IMPR II and the IMPR II will not transmit

any signal on the AUI port. In addition, the partition machine for the AUI port will be forced into idle

status.

Enable TP Ports

This command is used to enable a disabled TP port, allowing it to perform normal transmitting and

receiving operations. To reconnect a partitioned TP port or force a TP port into link fail state, the port

must first be disabled and then re-enabled using this command.

Disable TP Ports

Each TP port can be disabled individually. Bits 0, 1, and 2 are used to indicate the TP port that is to

be disabled, as follows: