LAN91C95 datasheet(9/144 Pages) SMSC

9 / 144 page

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

TYPE

DESCRIPTION

113

nROM/

nPCMCIA

I/O4 with

pullup

This pin is sampled at the end of RESET.

When this pin is sampled low the LAN91C95

is configured for PCMCIA operation and all pin

definitions correspond to the PCMCIA mode.

For ISA operation this pin is left open and is

used as a ROM chip select output that goes

active when nMEMR is low and the address

bus contains a valid ROM address.

35, 36,

38-43,

45-50,

52, 53

Address 0-

A0-A15

Input address lines 0 through 15.

Address 16

A16

ISA - Input address line 16.

nFlash

Memory

Write

nFWE

PCMCIA - Output. Flash Memory Write

Enable used for programming the attribute

memory. Goes active (low) when nWE=0 and

WRATTRIB=1 (in ECOR bit 3).

Address 17

A17

ISA - Input address line 17.

nFlash

Memory

Chip Select

nFCS

PCMCIA - Output. Flash Memory Chip Select

used to access attribute memory. Goes active

(low) when nREG=0, nCE1=0 and A15=0.

Address 18

A18

Input address line 18.

Address 19

A19

I with pullup

ISA - Input address line 19.

Card Enable

nCE1

PCMCIA - Card Enable 1 input. Used to select

card on even byte accesses.

Address

Enable

AEN

I with pullup

ISA - Address enable input. Used as an

address qualifier. Address decoding is only

enabled when AEN is low.

nREG

PCMCIA - Attribute memory and IO select

input. Asserted when the card attribute space

or IO space is being accessed.

nByte High

Enable

nSBHE

I with pullup

ISA - Byte High Enable input. Asserted (low)

by the system to indicate a data transfer on

the upper data byte.

nCard

Enable 2

nCE2

PCMCIA - Card Enable 2 input. Used to select

card on odd byte accesses.

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