W83977G-A Nuvoton Technology Corporation of America, W83977G-A Datasheet - Page 36

• 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

5.2.1
This register is used to monitor several disk interface pins in PS/2 and Model 30 modes. In PS/2
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.
0
1
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
DRV2 (Bit 6):
INDEX (Bit 2):
TRAK0 (Bit 4):
WP (Bit 1):
W83977F-A/ W83977G-A/ W83977AF-A/ W83977AG-A
A second drive has been installed
A second drive has not been installed
side 0
side 1
outward direction
inward direction
Status Register A (SA Register) (Read base address + 0)
7
6
5
4
3
-28
2
1
0
DIR
INDEX
WP
HEAD
TRAK0
STEP
INIT PENDING
DRV2