LAN91C95 Ver la hoja de datos (PDF) - SMSC -> Microchip

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LAN91C95

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

SMSC -> Microchip 

PIN NO.

NAME

12

nBoard

Select LED

Receive

Data

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

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nBSELED

OD16

Internal ENDEC - Board Select LED activated

by accesses to I/O space (nIORD or nIOWR

active with AEN low and valid address decode

for ISA, and with nREG low and and “Enable

Function” bit in the ECOR register is high for

PCMCIA). The pulse is stretched beyond the

access duration to make the LED visible.

RXD

I with pullup External ENDEC - NRZ receive data input.

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

I with pullup

Iclk

Diff. Input

Input. This active high input enables the

EEPROM to be read or written by the

LAN91C95. 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.

Input. When low the LAN91C95 is configured

for 16 bit bus operation. If left open the

LAN91C95 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.

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.

AUI receive differential inputs.

14

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