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

88

nI/O Read

87

nI/O Write

86

nMemory

Read

nOutput

Enable

24

nModem

Reset

18

Modem

Interrupt

23

nModem

Chip Select

17

Modem

Ready

27

nModem

Powerdown

DESCRIPTION OF PIN FUNCTIONS

SYMBOL

TYPE

DESCRIPTION

nIOIS16

PCMCIA - Active low output asserted

whenever the SMC91C95 is in 16 bit mode,

and “Enable Function” bit in the ECOR

register is high, nREG is low and A4-A15

decode to the LAN address specified in I/O

Base Registers 0 and 1 in PCMCIA attribute

space.

nIORD

IS with

pullup

Input. Active low read strobe used to access

the SMC91C95 IO space.

nIOWR

IS with

pullup

Input. Active low write strobe used to access

the SMC91C95 IO space.

nMEMR

IS with

pullup

ISA - Active low signal used by the host

processor to read from the external ROM.

nOE

nMRESET

MINT

nMCS

O4

I with pull

down

O4

PCMCIA - Output Enable input used to read

from the COR, CSR and attribute memory.

Reset output to Modem. Asserted whenever

RESET pin is high, internal POR is active, or

SRESET bit is high (MCOR bit 7).

Interrupt input from Modem. Reflected in

INTR (CSR bit 1) and asserts the appropriate

interrupt pin if enabled.

Chip select output to modem.

MRDY

nMPWDN

I with pullup

Modem ready input. Low indicates the modem

is not ready, either after reset or exiting from

stop or sleep modes.

O4

Powerdown output to modem controller. This

pin is active (low) when either the PWRDWN

bit (CSR bit 2) is set or the modem is disabled

(not configured).

12

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