LAN91C100FDREVB datasheet(7/68 Pages) SMSC

7 / 68 page

SMSC DS – LAN91C100FD REV. B

Page 7

Rev. 05/31/2000

DESCRIPTION OF PIN FUNCTIONS

PQFP/TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

84, 87, 88,

90, 91, 96,

99, 101, 100,

98, 89, 92,

103, 102,

104

RAM

Address

Bus

RA2-RA16

Outputs.

This bus specifies the buffer RAM

doubleword

being

accessed

the

LAN91C100FD.

nROE

Output. Active low signal used to read a

doubleword from buffer RAM.

31, 57, 73,

nRWE0-

RWE3

Outputs. Active low signals used to write any byte,

word or dword in RAM.

Receive

DMA

RCVDMA

Output. This pin is active during LAN91C100FD

write memory cycles of receive packets.

Crystal 1

Crystal 2

XTAL1

XTAL2

Iclk

An external 25 MHz crystal is connected across

these pins. If a TTL clock is supplied instead, it

should be connected to XTAL1 and XTAL2 should

be left open.

5, 10, 23, 27,

41, 63, 74,

83, 85, 107,

119, 125,

132, 143,

165, 179,

186, 191

Power

VDD

+5V power supply pins.

205

Analog

Power

AVDD

+5V analog power supply pins.

14, 32, 46,

50, 66, 75,

82, 94, 111,

116, 120,

122, 128,

134, 138,

169, 174,

180, 185,

200

Ground

GND

Ground pins.

203

Analog

Ground

AGND

Analog ground pin.

Transmit

Enable

TXEN

Output. Used for 10 Mbps ENDEC. This pin stays

low when MIISEL is high.

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.

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