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FDC87W21

Power I/O Controller with Fast Infrared Support

SMSC -> Microchip 

SYMBOL PIN

nINIT

21

nAFD

20

nSTB

19

I/O

OD12

OD12

OUT12t

OD12

OUT12t

OD12

OD12

OUT12t

OD12

OUT12t

OD12

-

OUT12t

-

OUT12t

FUNCTION

PRINTER MODE: nINIT

Output line for the printer initialization. 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: nDIR

This pin is for Extension FDD B; its function is the same as that of

the nDIR pin.

EXTENSION ADAPTER MODE: nXDACK

This pin is the DMA acknowledge output for the Extension Adapter;

the output is sent directly from nPDACKX.

EXTENSION 2FDD MODE: nDIR2

This pin is for Extension FDD A and B; its function is the same as

that of the nDIR pin.

JOYSTICK MODE: VDD for joystick.

PRINTER MODE: nAFD

An active low output from this pin causes the printer to auto feed a

line after a line is printed. 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: nRWC2

This pin is for Extension FDD B; its function is the same as that of

the nRWC pin.

EXTENSION ADAPTER MODE: nXRD

This pin is the I/O read command for the Extension Adapter.

When the Extension Adapter base address is written to the

Extension Adapter address register, nXRD and nXWR go low

simultaneously so that the command register on the Extension

Adapter can latch the same base address.

EXTENSION 2FDD MODE: nRWC2

This pin is for Extension FDD A and B; its function is the same as

that of the nRWC pin.

JOYSTICK MODE: VDD for joystick.

PRINTER MODE: nSTB

An active low output is used to latch the parallel data into the

printer. 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: This pin is a tri-state output.

EXTENSION ADAPTER MODE: nXWR

This pin is the I/O write command for the Extension Adapter. When

the Extension Adapter base address is written to the Extension

Adapter address register, nXRD and nXWR go low simultaneously

so that the command register on the Extension Adapter can latch

the same base address.

EXTENSION 2FDD MODE: This pin is a tri-state output.

JOYSTICK MODE: VDD for joystick.

12

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