W83877 Winbond Electronics Corp America, W83877 Datasheet - Page 31

• Manufacturer Part Number: W83877
• Description: Winbond I/O
• Manufacturer: Winbond Electronics Corp America

STEP (Bit 5):
This bit indicates the complement of STEP output.
This bit indicates the value of TRAK0 input.
HEAD (Bit 3):
This bit indicates the complement of HEAD output.
0
1
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):
INDEX (Bit 2):
TRAK0 (Bit 4):
WP (Bit 1):
side 0
side 1
outward direction
inward direction
7
6
5
4
3
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2
1
0
Publication Release Date: January 1996
DIR
WP
INDEX
HEAD
TRAK0
STEP F/F
INIT PENDING
DRQ
W83877F
Revision A2