W83977EF Datasheet, PDF(22/150 Page) Winbond

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W83977EF Datasheet, PDF (22/150 Pages) Winbond – WINBOND I/O

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W83977EF

1.5 Multi-Mode Parallel Port, continued

SYMBOL PIN

I/O

PD7

I/O24t

OD24

FUNCTION

PRINTER MODE: PD7

Parallel port data bus bit 7. Refer to description of the parallel

port for 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.

1.6 FDC Interface

SYMBOL PIN

DRVDEN0

DRVDEN1

GP10

(IRQIN1)

P12

SCI#

HEAD#

WE#

WD#

STEP#

DIR#

MOB#

I/O

OD24

IO24t

OUT12t

OD24

FUNCTION

Drive Density Select bit 0.

Drive Density Select bit 1. (CR2A bit 1_0 = 00, default)

General purpose I/O port 1 bit 0. (CR2A bit 1_0 = 01)

Alternate Function from GP10: Interrupt channel input.

KBC P12 I/O port. (CR2A bit 1_0 = 10)

System Control Interrupt (CR2A bit 1_0 = 11)

Head select. This open drain output determines which disk drive

head is active.

Logic 1 = side 0

Logic 0 = side 1

Write enable. An open drain output.

Write data. This logic low open drain writes pre-compensation

serial data to the selected FDD. An open drain output.

Step output pulses. This active low open drain output produces

a pulse to move the head to another track.

Direction of the head step motor. An open drain output.

Logic 1 = outward motion

Logic 0 = inward motion

Motor B On. When set to 0, this pin enables disk drive 1. This is

an open drain output.

Publication Release Date: April 2003

-16 -

Revision 1.1

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