LAN91C94 datasheet(11/120 Pages) SMSC

11 / 120 page

PIN NUMBER

QFP

VTQFP/

TQFP

NAME

SYMBOL

BUFFER

TYPE

DESCRIPTION

nI/O 16

nIOCS16/

nIOIS16

OD24

ISA - Active low output asserted in 16

bit mode when AEN is low and A4-A15

decode to the LAN91C94 address

programmed into the high byte of the

Base Address Register

PCMCIA - Active low output asserted

whenever the LAN91C94 is in 16 bit

mode, COR0 bit is high, and REG* is

low

nI/O Read

nIORD

IS with

pullup

Input - Active low read strobe to

access the LAN91C94 IO space

nIOWR

IS with

pullup

Input - Active low write strobe to

access the LAN91C94 IO space

nMEMR/

nOE

IS with

pullup

ISA - Active low signal used by the

host

processor

read

from

the

external ROM.

PCMCIA - Output Enable input used to

read from the COR, CSR, and attribute

memory

EEPROM

Clock

EESK

Output - 4usec clock used to shift data

in and out of a serial EEPROM

EEPROM

Select

EECS

Output - Serial EEPROM chip select

EEPROM

Data Out

EEDO/

SDOUT

Output - Connected to the DI input of

the serial EEPROM

EEPROM

Data In

EEDI

I with pull-

down

Input - Connected to the DO output of

the serial EEPROM

98,

99,1

96,97

I/O Base

IOS0-2

I with

pullup

Input

External

switches

can

connected to these lines to select

between

predefined

EEPROM

configurations. The values of these

pins are readable

nTransmit

Led/

nTransmit

Enable

nTXLED/

nTXEN

OD16

O162

INTERNAL ENDEC - Transmit LED

output

EXTERNAL

ENDEC

Active

low

Transmit Enable output

LAN91C94 Datasheet(PDF) 11 Page - SMSC Corporation

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