w83977ctf Winbond Electronics Corp America, w83977ctf Datasheet - Page 43

• Manufacturer Part Number: w83977ctf
• 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.
WP#(Bit 1):
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.
HEAD# (Bit 3):
This bit indicates the value of HEAD# output.
0
1
side 0
side 1
outward direction
inward direction
side 1
side 0
disk is write-protected
disk is not write-protected
7
6
5
4
3
-34 -
2
1
0
DIR#
WP
INDEX
HEAD#
TRAK0
STEP F/F
DRQ
INIT PENDING
Publication Release Date: March 1999
W83977EF/ CTF
PRELIMINARY
Revision A1