W83977AF Information Storage Devices, Inc, W83977AF Datasheet - Page 43

• Manufacturer Part Number: W83977AF
• Description: W83877TF Plus Kbc, Cir, RTC
• Manufacturer: Information Storage Devices, Inc

HEAD (Bit 3):
This bit indicates the complement of HEAD output.
0
1
This bit indicates the value of INDEX output.
0
1
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.
INDEX (Bit 2):
HEAD (Bit 3):
WP (Bit 1):
side 0
side 1
outward direction
inward direction
disk is write-protected
disk is not write-protected
7
6
5
4
3
2
1
0
W83977F/ W83977AF
DIR
INDEX
WP
HEAD
TRAK0
STEP F/F
DRQ
INIT PENDING
Publication Release Date: March 1998
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PRELIMINARY
Revision 0.58