W83877ATF Datasheet, PDF(16/191 Page) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

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W83877ATF Datasheet, PDF (16/191 Pages) Winbond – enhanced version from Winbonds most popular I/O chip W83877F

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W83877ATF

1.3 Multi-Mode Parallel Port, continued

SYMBOL PIN

I/O

STB

OD12

PD0

PD1

I/O24t

INt

I/O24t

INt

FUNCTION

PRINTER MODE: STB

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: No Connection

This pin is a tri-state output.

EXTENSION 2FDD MODE: No Connection

This pin is a tri-state output.

PRINTER MODE: PD0

Parallel port data bus bit 0. Refer to the description of the

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

EXTENSION FDD MODE: INDEX2

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

same as that of the INDEX pin. This pin is pulled high internally.

EXTENSION 2FDD MODE: INDEX2

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

the same as INDEX pin. This pin is pulled high internally.

PRINTER MODE: PD1

Parallel port data bus bit 1. Refer to the description of the

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

EXTENSION FDD MODE: TRAK02

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

same as that of the TRAK0 pin. This pin is pulled high internally.

EXTENSION. 2FDD MODE: TRAK02

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

the same as TRAK0 pin. This pin is pulled high internally.

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Publication Release Date: April 1998

Version 0.51

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