TNETX3150 datasheet(43/113 Pages) TI1

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TNETX3150/TNETX3150A

ThunderSWITCH™ 15-PORT 10-/100-MBIT/S ETHERNET™ SWITCH

SPWS027F – FEBRUARY 1997 – REVISED SEPTEMBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

port-N status register at 0x8*N + 0x0001 (read only) (N = port number in hex) (continued)

The uplink port (port 00) does not have a port address, so it cannot enter either address mismatch state. It can

receive frames with source addresses securely assigned to other ports. In such cases, if SECDIS bit is set, the

port enters state 110 (disabled due to address duplication). Port suspension is not supported because a network

port naturally receives frames with different source addresses. Waiting for the source address to change is not

useful.

PORT STATE

DESCRIPTION

000

Enabled. This is the normal state of a port. This is the only port state when frames are forwarded to and from the port. In all

other states, no new frames are forwarded to or from the port.

001

Suspended due to link failure. The port has been suspended due to the absence of link activity at the port, as indicated by

an inactive (zero) state of the port’s MXXLINK terminal. This can indicate cable failure or no station attached to the port. The

port is re-enabled once link activity is detected at the port, as indicated by an active (1) state of the port’s MXXLINK terminal.

If link is lost during transmission of a frame, the transmitted frame is lost and transmission continues until the start of the next

frame.

010

Suspended due to address duplication. The port has been suspended due to the reception at the port of a frame with a source

address securely assigned to another port. The port is re-enabled if a frame is received at the port with a source address not

securely assigned to another port. A port in this state also can be re-enabled by writing a 1 to the ENABLE control bit.

011

Suspended due to address mismatch. The port has been suspended due to the reception at the port of a frame with a source

address different from that securely assigned to it. The port is re-enabled if a frame is received at the port with a source

address equal to the address securely assigned to it. A port in this state also can be re-enabled by writing a 1 to the ENABLE

control bit.

100

Disabled by management. The port has been explicitly disabled by a DISABLE control bit write (or it is in the buffer initialization

state). In this state, the port can be re-enabled only by writing a 1 to the ENABLE control bit, or by clearing the disable bit.

101

Reserved

110

Disabled due to address duplication. The port has been disabled due to the reception at the port of a frame with a source

address securely assigned to another port. In this state, no frames are forwarded to or from the port, and no address learning

takes place. A port in this state can only be re-enabled by writing a 1 to the ENABLE control bit.

111

Disabled due to address mismatch. The port has been disabled due to the reception at the port of a frame with a source

address different from that securely assigned to it. In this state, no frames are forwarded to or from the port. A port in this state

can be re-enabled only by writing a 1 to the ENABLE control bit.

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