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

16

n16 Bit

Modem

110 EEPROM

Clock

109 EEPROM

Chip Select

108 EEPROM

Data Out

107 EEPROM

Data In

103, I/O Base

105, 106

9

nTransmit

LED

nTransmit

Enable

12

nRoard

Select LED

Receive

Data

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nMIS16

I with pullup

Input. When low, it indicates a 16 bit modem,

otherwise the modem is 8 bit wide. Used to

determine if nIOIS16 (PCMCIA) and nIOCS16

(ISA) need to be asserted for modem cycles.

The value of this pin may change from cycle

to cycle.

EESK

O4

Output. 4µs clock used to shift data in and out

of the serial EEPROM.

EECS

O4

Output. Serial EEPROM chip select.

EEDO/

SDOUT

EEDI

IOS0-IOS2

nTXLED

O4

Output. Connected to the DI input of the serial

EEPROM.

I with pull-

down

Input. Connected to the DO output of the

serial EEPROM.

I with pullup

Input. External switches can be connected to

these lines to select between predefined

EEPROM configurations. The values of these

pins are readable. These pins are used in ISA

mode only. If in PCMCIA mode, these pins

are not used.

OD16

Internal ENDEC - Transmit LED output.

nTXEN

nBSELED

RXD

O162

External ENDEC - Active low Transmit

Enable output.

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.

I with pullup External ENDEC - NRZ receive data input.

14

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