TNETX3190 datasheet(8/66 Pages) TI1

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TNETX3190

ThunderSWITCH

™ 16/3 ETHERNET™ SWITCH

WITH 16 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS

SPWS046B – FEBRUARY 1998 – REVISED APRIL 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

10-/100-Mbit/s MAC interface (ports 16–18) (continued)†

TERMINAL

I/O

INTERNAL

DESCRIPTION

NAME

NO.

I/O

RESISTOR

DESCRIPTION

M16TXD3

M16TXD2

M16TXD1

M16TXD0

M17TXD3

M17TXD2

M17TXD1

M17TXD0

M18TXD3

M18TXD2

M18TXD1

M18TXD0

None

Transmit data (nibble transmit data). When MxxTXEN is asserted, these signals carry

transmit data. Data on these signals is synchronous to MxxTCLK. MxxTXD0 is the least

significant bit and MxxTXD3 is the most significant bit.

M16TXEN

M17TXEN

M18TXEN

None

Transmit enable. MxxTXEN indicates valid transmit data on MxxTXD3–MxxTXD0.

M16TXER

M17TXER

M18TXER

None

Transmit error. MxxTXER allows coding errors to be propagated across the MII. MxxTXER

is taken high when an under-run in the transmit FIFO for port xx occurs and causes fill data

to be transmitted (MxxTXER is low otherwise). MxxTXER is asserted at the end of an

under-running frame, enabling the device to force a coding error.

† xx = ports 16, 17, and 18

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