LAN91C100FD datasheet(10/79 Pages) SMSC

10 / 79 page

FEAST Fast Ethernet Controller with Full Duplex Capability

Rev. 10/14/2002

Page 10

SMSC DS – LAN91C100FD Rev. D

PRELIMINARY

PQFP/TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

201

Transmit

Data

TXD

Output. NRZ Transmit Data for 10 Mbps

ENDEC interface.

208

Carrier

Sense

CRS

I with

pulldown

Input. Carrier sense from 10 Mbps ENDEC

interface. This pin is ignored when MIISEL is

high.

207

Collision

Detect

COL

I with

pulldown

Input. Collision detection indication from 10

Mbps ENDEC interface. This pin is ignored

when MIISEL is high.

206

Receive

Data

RXD

I with

pullup

Input. NRZ Receive Data from 10 Mbps ENDEC

interface. This pin is ignored when MIISEL is

high.

197

Transmit

Clock

TXC

I with

pullup

Input. 10 MHz transmit clock used in 10 Mbps

operation. This pin is ignored when MIISEL is

high.

199

Receive

Clock

RXC

I with

pullup

Input. 10 MHz receive clock recovered by the 10

Mbps ENDEC. This pin is ignored when MIISEL

is high.

202

Loopback

LBK

Output. Active when LOOP bit is set (TCR bit 1).

Independent of port selection (MIISEL=X).

nLink

Status

nLNK

I with

pullup

Input. General purpose input port used to

convey LINK status (EPHSR bit 14).

Independent of port selection (MIISEL=X).

195

nFullstep

nFSTEP

Output. Non volatile output pin. Driven by

inverse of FULLSTEP (CONFIG bit 10).

Independent of port selection (MIISEL=X).

MII Select

MIISEL

Output. Non volatile output pin. Driven by MII

SELECT (CONFIG bit 15). High indicates the

MII port is selected, low indicates the 10 Mbps

ENDEC is selected.

194

AUI Select

AUISEL

Output. Non volatile output pin. Driven by AUI

SELECT (CONFIG bit 8). Independent of port

selection (MIISEL= X).

Transmit

Enable

100 Mbps

TXEN100

O12

Output to MII PHY. Envelope to 100 Mbps

transmission. This pin stays low if MIISEL is low.

Carrier

Sense 100

Mbps

CRS100

I with

pulldown

Input from MII PHY. Envelope of packet

reception used for deferral and backoff

purposes. This pin is ignored when MIISEL is

low.

Receive

Data Valid

RX_DV

I with

pulldown

Input from MII PHY. Envelope of data valid

reception. Used for receive data framing. This

pin is ignored when MIISEL is low.

Collision

Detect

100 Mbps

COL100

I with

pulldown

Input from MII PHY. Collision detection input.

This pin is ignored when MIISEL is low.

25, 26, 28,

Transmit

Data

TXD0-

TXD3

O12

Outputs. Transmit Data nibble to MII PHY.

Transmit

Clock

TX25

I with

pullup

Input. Transmit clock input from MII. Nibble rate

clock (25 MHz). This pin is ignored when

MIISEL is low.

Receive

Clock

RX25

I with

pullup

Input. Receive clock input from MII PHY. Nibble

rate clock. This pin is ignored when MIISEL is

low.

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