LAN91C100FD datasheet(8/68 Pages) SMSC

8 / 68 page

SMSC DS – LAN91C100FD REV. B

Page 8

Rev. 05/31/2000

DESCRIPTION OF PIN FUNCTIONS

PQFP/TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

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.

20, 21, 22,

Receive

Data

RXD0-

RXD3

Inputs.

Received Data nibble from MII PHY.

These pins are ignored when MIISEL is low.

198

Manage-

ment Data

Input

MDI

I with

pulldown

MII management data input.

196

Manage-

ment Data

Output

MDO

MII management data output.

192

Manage-

ment Clock

MCLK

MII management clock.

Receive

Error

RX_ER

I with

pulldown

Input. Indicates a code error detected by PHY.

Used by the LAN91C100FD to discard the packet

being received. The error indication reported for

this event is the same as a bad CRC (Receive

Status Word bit 13). This pin is ignored when

MIISEL is low.

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