TNETX3100PGC datasheet(29/80 Pages) TI1

29 / 80 page

TNETX3100

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

SPWS031D – JUNE 1997 – REVISED OCTOBER 1997

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

port-N status register at 0x2*N + 0x0081 (read only) (N = port number in hex)

INITIAL VALUES AFTER RESET

BIT

UPDATE

NLINK

Reserved

SPEED

DUPLX

Port state



BIT

NAME

FUNCTION

UPDATE

Transmit queue-length update pending. UPDATE indicates when the transmit queue-length information is 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 (after this port has transmitted a frame). UPDATE is maintained

only for ports with the LINK signal active. Any port with link down is not updated.

NLINK

Not link. NLINK indicates that the port’s link is inactive. NLINK = 1, when the port does not have a valid link.

NLINK = 0, when the port has a valid link. NLINK reports the inverse of the state of the port’s MXXLINK terminal.

Reserved

Reserved. Not implemented (this bit is always read as zero).

SPEED

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

SPEED = 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 DUPLX = 1, it

indicates full duplex. When DUPLX = 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 – Reserved

011 – Reserved

100 – Disabled by management

101 – Reserved

110 – Disabled due to address duplication

111 – Reserved

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 the port DISABLE bit is set.

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