LAN91C110 datasheet(6/55 Pages) SMSC

6 / 55 page

FEAST Fast Ethernet Controller for PCMCIA and Generic 16-Bit Applications

SMSC DS – LAN91C110 REV. B

Page 6

Rev. 09/05/02

144 TQFP

PIN NO.

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

86,84,85,

75,72,80, 82-

83,81, 77,74-

73, 71-70,67

RAM

Address

Bus

RA[16:2]

Outputs. This bus specifies the buffer RAM

doubleword being accessed by the LAN91C110.

nROE

Output. Active low signal used to read a

doubleword from buffer RAM.

24,44,58, 68

nRWE[3:0]

Outputs. Active low signals used to write any

byte, word or dword in RAM.

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.

nLink

Status

nLNK

I with pullup Input. General purpose input port used to convey

LINK status (EPHSR bit 14).

139

AUI Select AUISEL

Output. Non volatile output pin. Driven by AUI

SELECT (CONFIG bit 8).

Transmit

Enable

MII

TXEN100

O12

Output to MII PHY. Envelope to 100 Mbps

transmission.

Carrier

Sense MII

CRS100

I with

pulldown

Input from MII PHY. Envelope of packet reception

used for deferral and backoff purposes.

Receive

Data Valid

RX_DV

I with

pulldown

Input from MII PHY. Envelope of data valid

reception. Used for receive data framing.

Collision

Detect MII

COL100

I with

pulldown

Input from MII PHY. Collision detection input.

18,19,21, 22 Transmit

Data

TXD[3:0]

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).

Receive

Clock

RX25

I with pullup Input. Receive clock input from MII PHY. Nibble

rate clock.

16-13

Receive

Data

RXD[3:0]

Inputs. Received Data nibble from MII PHY.

141

Manage-

ment Data

Input

MDI

I with

pulldown

MII management data input.

140

Manage-

ment Data

Output

MDO

MII management data output.

137

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 LAN91C110 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).

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