TNETX3151 datasheet(8/65 Pages) TI1

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TNETX3151

ThunderSWITCH

™ 12/3 ETHERNET™ SWITCH

WITH 12 10-MBIT/S PORTS AND 3 10-/100-MBIT/S PORTS

SPWS048A – MARCH 1998 – REVISED APRIL 1999

POST OFFICE BOX 655303

• DALLAS, TEXAS 75265

Terminal Functions (Continued)

10-/100-Mbit/s MAC interface (ports 12–14) (continued)†

TERMINAL

I/O

INTERNAL

DESCRIPTION

NAME

NO.

I/O

RESISTOR

DESCRIPTION

M12TXD3

M12TXD2

M12TXD1

M12TXD0

M13TXD3

M13TXD2

M13TXD1

M13TXD0

M14TXD3

M14TXD2

M14TXD1

M14TXD0

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.

M12TXEN

M13TXEN

M14TXEN

None

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

M12TXER

M13TXER

M14TXER

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 12, 13, and 14

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