DP83953 datasheet(57/90 Pages) NSC

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7.0 RIC2A Registers (Continued)

Port Real Time Status Registers (Address 01H to 0DH)

DISPT

SQL

PTYPE1

PTYPE0

PART

REC

COL

GDLNK

Bit

R/W

Symbol

Description

R/W

GDLNK

Good link

0: Link pulses are being received by the port.

1: Link pulses are not being received by the port logic.

Note: Writing a 1 to this bit will cause the 10Base-T transceiver not to transmit or monitor the reception of

link pulses. If port 1 (AUI port) is read, then this bit is undefined.

COL

Collision

0: A collision is happening or has occurred during the current packet.

1: No collisions have occurred as yet during this packet.

REC

Receive

0: This port is now or has been the receive source of packet or collision information

for the current packet.

1: This port has not been the receive source during the current packet.

R/W

PART

Partition

0: This port is partitioned.

1: This port is not partitioned.

Writing a logic one to this bit forces segment reconnection and partition state

machine reset. Writing a zero to this bit has no effect.

D(5,4)

PTYPE0

PTYPE1

Partition Type 0

Partition Type 1

The partition type bits provide information specifying why the port is partitioned.

R/W

SQL

Squelch Levels

0: Port operates with normal IEEE receive squelch level.

1: Port operates with reduced receive squelch level.

Note 1: In addition to hysteresis that DP83950 RIC provides on normal receive squelch, DP83953 RIC2A

provides a hysteresis when operating in the reduced squelch level mode.

R/W

DISPT

Disable Port

0: Port operates as defined by repeater operations.

1: All port activity is prevented.

PTYPE1

PTYPE0

Information

Consecutive collision limit reached

Excessive length of collision limit reached

Failure to see data loopback from transceiver in monitored

window

Processor forced reconnection

DP83953 Datasheet(PDF) 57 Page - National Semiconductor (TI)

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