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FDC87W22

Power I/O Controller

SMSC -> Microchip 

Multi-Mode Parallel Port

SYMBOL

PIN

I/O

BUSY

24

INt

nACK

OD12

INt

OD12

_

26

INt

OD12

INt

OD12

_

The following pins have eight functions, which

are controlled by bits PRTMOD0, PRTMOD1,

and PRTMOD2 of CR0 and CR9 (refer to the

Extended Functions section).

FUNCTION

PRINTER MODE: BUSY

An active high input indicates that the printer is not ready to

receive data. This pin is pulled high internally. Refer to the

description of the parallel port for the definition of this pin in

ECP and EPP mode.

EXTENSION FDD MODE: nMOB2

This pin is for Extension FDD B; the function of this pin is the

same as that of the nMOB pin.

EXTENSION ADAPTER MODE: XIRQ

This pin is an interrupt request generated by the Extension

Adapter and is an active high input.

EXTENSION 2FDD MODE: nMOB2

This pin is for Extension FDD A and B; the function of this pin

is the same as that of the nMOB pin.

JOYSTICK MODE: NC pin.

PRINTER MODE: nACK

An active low input on this pin indicates that the printer has

received data and is ready to accept more data. This pin is

pulled high internally. Refer to the description of the parallel

port for the definition of this pin in ECP and EPP mode.

EXTENSION FDD MODE: nDSB2

This pin is for the Extension FDD B; its functions are the

same as those of the nDSB pin.

EXTENSION ADAPTER MODE: XDRQ

DMA request generated by the Extension Adapter. An active

high input.

EXTENSION 2FDD MODE: nDSB2

This pin is for Extension FDD A and B; this function of this pin

is the same as that of the nDSB pin.

JOYSTICK MODE: NC pin.

10

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