TNETX3150 datasheet(42/113 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)

INITIAL VALUES AFTER RESET

BIT

UPDATE

NLINK

PROTOCOL

SPEED

DUPLX

Port state



BIT

NAME

FUNCTION

UPDATE

Transmit queue-length update pending. UPDATE indicates when the transmit queue-length information has been

updated for this port. UPDATE = 1 pending a transmit queue-length at initialization and when a queue-length update

is pending. UPDATE = 0 when the update is complete. UPDATE is maintained only for ports with the LINK signal

active. Any port with LINK inactive is not updated.

NLINK

Not link. NLINK indicates that the port’s link is inactive. NLINK reports the inverse of the state of the port’s MXXLINK

terminal.

PROTOCOL

Interface protocol. PROTOCOL indicates the protocol of the interface and is determined by the logic level on

MXXPROTOCOL. When PROTOCOL = 1, it indicates a request/grant interface for datastreaming applications.

When PROTOCOL = 0, it indicates a CSMA/CD interface. For 200-Mbit/s uplink operation, PROTOCOL should

be 1 (refer to uplink section for details). For standard Ethernet applications, PROTOCOL should be 0.

SPEED

Network speed. SPEED indicates the speed of a network port. When set to a 1, it indicates 100 Mbit/s. When set

to a 0, it indicates 10 Mbit/s. SPEED is a direct reflection of the state of the port’s MXXSPEED terminal

(non-10-Mbit/s ports). Ports with 10 Mbit/s always have a 0 in SPEED.

DUPLX

Full-duplex network. DUPLX indicates that a network port is operating in full-duplex mode. When set to a 1, it

indicates full duplex. When set to a 0, it indicates half duplex. DUPLX is a direct reflection of the state of the port’s

MXXDUPLX terminal.

2–0

Port state

This field indicates the state of the port.

000 – Enabled

001 – Suspended due to link failure

010 – Suspended due to address duplication

011 – Suspended due to address mismatch

100 – Disabled by management

101 – Reserved

110 – Disabled due to address duplication

111 – Disabled due to address mismatch

Reset places all ports in state 100 (disabled by management). Completion of buffer memory initialization (START

complete) places all ports in state 000 (enabled) unless port DISABLE bit is set.

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