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.

NAME

10

nReceive

LED

Receive

Clock

11

nLink LED

Transmit

Data

111 Enable

EEPROM

115 nEnable 16

Bit

101 Crystal 1

102 Crystal 2

123 AUI Receive

124

2

AUI

3

Transmit

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nRXLED

OD16

Internal ENDEC - Receive LED output.

RXCLK

I with pullup External ENDEC - Receive clock input.

nLNKLED

TXD

OD16

0162

Internal ENDEC - Link LED output.

External ENDEC - Transmit Data output.

ENEEP

nEN16

XTAL1

XTAL2

RECP

RECN

I with pullup

Input. This active high input enables the

EEPROM to be read or written by the

SMC91C95. Internally pulled up. Must be

connected to ground if no serial EEPROM is

used. In PCMCIA mode, a parallel EEPROM

is required if no serial EEPROM is used.

I with pullup

Input. When low the SMC91C95 is configured

for 16 bit bus operation. If left open the

SMC91C95 works in 8 bit bus mode. 16 bit

configuration can also be programmed via

serial EEPROM (In ISA Mode only) or via

software initialization of the CONFIGURATION

REGISTER.

Iclk

An external parallel resonance 20 MHz crystal

should be connected across these pins. If an

external clock source is used, it should be

connected to XTAL1 and XTAL2 should be

left open.

Diff. Input AUI receive differential inputs.

TXP/nCOLL

TXN/nCRS

Diff.

Output

I

15

Internal ENDEC - (nXENDEC pin open). In

this mode TXP and TXN are the AUI transmit

differential outputs. They must be externally

pulled up using 150 ohm resistors.

External ENDEC - (nXENDEC pin tied low).

In this mode the pins are inputs used for

collision and carrier sense functions.

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