W83977G-A Nuvoton Technology Corporation of America, W83977G-A Datasheet - Page 37

• Manufacturer Part Number: W83977G-A
• Description: IC I/O CONTROLLER 128-PQFP
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83977G-A

• Pin Count: 128
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
This bit indicates the value of HEAD output.
0
1
INDEX (Bit 2):
This bit indicates the complement of INDEX output.
WP (Bit 1):
0
1
This bit indicates the direction of head movement.
0
1
HEAD (Bit 3):
DIR (Bit 0)
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
side 1
side 0
disk is not write-protected
disk is write-protected
inward direction
outward direction
7
6
5
4
3
-29 -
2
1
0
DIR
WP
INDEX
TRAK0
HEAD
STEP F/F
DRQ
INIT PENDING
Publication Release Date: May 2006
Revision 0.60