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FDC87W22

Power I/O Controller

SMSC -> Microchip 

SYMBOL

nINIT

nAFD

PIN

I/O

FUNCTION

21

OD12 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.

OD12

OUT12t

EXTENSION FDD MODE: nDIR2

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

that of the nDIR pin.

EXTENSION ADAPTER MODE: nXDACK

OD12

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

OUT12t same as that of the nDIR pin.

JOYSTICK MODE: VDD for joystick.

20

OD12 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.

OD12

OUT12t

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.

OD12

OUT12t

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.

13

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