W83977EF-AW datasheet(35/142 Pages) WINBOND

Part #	W83977EF-AW

Description	WINBOND ISA I/O

Download	142 Pages

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Manufacturer	WINBOND [Winbond]

Direct Link	http://www.winbond.com

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W83977EF-AW/W83977EG-AW

Publication Release Date: Apr. 2006

-33-

Revision 1.2

TRAK0#(Bit 4):

This bit indicates the value of TRAK0# input.

HEAD (Bit 3):

This bit indicates the complement of HEAD# output.

0

side 0

1

side 1

INDEX#(Bit 2):

This bit indicates the value of INDEX# output.

WP#(Bit 1):

0

disk is write-protected

1

disk is not write-protected

DIR (Bit 0)

This bit indicates the direction of head movement.

0

outward direction

1

inward direction

In PS/2 Model 30 mode, the bit definitions for this register are as follows:

1

2

3

4

5

6

7

0

WP

INDEX

HEAD#

TRAK0

STEP F/F

DRQ

INIT PENDING

DIR#

INIT PENDING (Bit 7):

This bit indicates the value of the floppy disk interrupt output.

DRQ (Bit 6):

This bit indicates the value of DRQ output pin.

STEP F/F (Bit 5):

This bit indicates the complement of latched STEP# output.

TRAK0 (Bit 4):

This bit indicates the complement of TRAK0# input.

HEAD# (Bit 3):

This bit indicates the value of HEAD# output.

0

side 1

1

side 0

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