w83977atf Winbond Electronics Corp America, w83977atf Datasheet - Page 33

• Manufacturer Part Number: w83977atf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

HEAD (Bit 3):
This bit indicates the complement of HEAD output.
0
1
INDEX (Bit 2):
This bit indicates the value of INDEX output.
0disk is write-protected
1disk is not write-protected
DIR (Bit 0)
This bit indicates the direction of head movement.
0
1
In PS/2 Model 30 mode, the bit definitions for this register are as follows:
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.
WP (Bit 1):
side 0
side 1
outward direction
inward direction
7
6
5
4
3
-32-
2
1
0
DIR
INDEX
WP
HEAD
TRAK0
STEP F/F
DRQ
INIT PENDING
Publication Release Date: April 1998
W83977ATF
PRELIMINARY
Revision 0.52