LAN91C95 datasheet(13/144 Pages) SMSC

13 / 144 page

DESCRIPTION OF PIN FUNCTIONS

PIN NO.

NAME

SYMBOL

TYPE

DESCRIPTION

Speaker

Output

SPKROUT

O4 tri-stable

with pullup

Speaker Output. This pin reflects the SPKRIN

pin when enabled by the AUDIO bit (Modem

CSR bit 3). When disabled this pin is tri-

stated.

nMPDOUT

I Schmitt

Used to control Powerdown mode. Tie to a

180K pull-up and a 0.1uF cap to ground.

Tie high when not used. This signal is used

in the RC time constant.

MFBK1

O4 with

pullup

Tie to nMPDOUT through a 5.1M resistor.

This signal is used in the RC time constant

in conjuction with the nMPDOUT pin.

n16 Bit

Modem

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.

110

EEPROM

Clock

EESK

Output. 4

µs clock used to shift data in and out

of the serial EEPROM.

109

EEPROM

Chip Select

EECS

Output. Serial EEPROM chip select.

108

EEPROM

Data Out

EEDO/

SDOUT

Output. Connected to the DI input of the serial

EEPROM.

107

EEPROM

Data In

EEDI

I with pull-

down

Input. Connected to the DO output of the serial

EEPROM.

103,

105, 106

I/O Base

IOS0-IOS2

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.

nTransmit

LED

nTXLED

OD16

Internal ENDEC - Transmit LED output.

nTransmit

Enable

nTXEN

O162

External ENDEC - Active low Transmit Enable

output.

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