SMC91C95 Ver la hoja de datos (PDF) - SMSC -> Microchip

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SMC91C95

ISA/PCMCIA Full Duplex Single-Chip Ethernet and Modem Controller with RAM

SMSC -> Microchip 

PIN NO.

113

NAME

35, 36,

38-43,

45-50,

52, 53

54

Address 0-

15

Address 16

nFlash

Memory

Write

55

Address 17

nFlash

Memory

Chip Select

56

Address 18

57

Address 19

Card Enable

1

34

Address

Enable

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nROM/

nPCMCIA

I/O4 with

pullup

This pin is sampled at the end of RESET.

When this pin is sampled low the SMC91C95

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.

A0-A15

I

Input address lines 0 through 15.

A16

nFWE

A17

nFCS

A18

A19

nCE1

AEN

nREG

I

ISA - Input address line 16.

O4

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).

I

ISA - Input address line 17.

O4

PCMCIA - Output. Flash Memory Chip Select

used to access attribute memory. Goes active

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

I

Input address line 18.

I with pullup ISA - Input address line 19.

PCMCIA - Card Enable 1 input. Used to

select card on even byte accesses.

I with pullup

ISA - Address enable input. Used as an

address qualifier. Address decoding is only

enabled when AEN is low.

PCMCIA - Attribute memory and IO select

input. Asserted when the card attribute space

or IO space is being accessed.

9

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