W83977ATF Datasheet, PDF(16/207 Page) Winbond – WINBOND I/O

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W83977ATF Datasheet, PDF (16/207 Pages) Winbond – WINBOND I/O

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1.5 Multi-Mode Parallel Port, continued

SYMBOL PIN

I/O

PD4

27

I/O24t

INt

INt

PD5

PD6

26

I/O24t

-

-

24

I/O24t

-

OD24

PD7

23

I/O24t

-

OD24

W83977ATF

PRELIMINARY

FUNCTION

PRINTER MODE: PD4

Parallel port data bus bit 4. Refer to the description of the

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

EXTENSION FDD MODE: DSKCHG2

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

same as the DSKCHG pin of FDC. It is pulled high internally.

EXTENSION 2FDD MODE: DSKCHG2

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

the same as the DSKCHG pin of FDC. It is pulled high internally.

PRINTER MODE: PD5

Parallel port data bus bit 5. 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 2FDD MODE: This pin is a tri-state output.

PRINTER MODE: PD6

Parallel port data bus bit 6. 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. 2FDD MODE: MOA2

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

MOA pin of FDC.

PRINTER MODE: PD7

Parallel port data bus bit 7. 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 2FDD MODE: DSA2

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

DSA pin of FDC.

Publication Release Date: April 1998

-15 -

Revision 0.52

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