w83977atg Winbond Electronics Corp America, w83977atg Datasheet - Page 38

• Manufacturer Part Number: w83977atg
• Description: W83877tf Plus Kbc, Gp I/o, Wake-up, Fir, Cir, Pb-free
• Manufacturer: Winbond Electronics Corp America

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):
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
- 30 -
2
1
W83977ATF/W83977ATG
0
DIR
WP
INDEX
TRAK0
HEAD
STEP F/F
DRQ
INIT PENDING