w83627sf Winbond Electronics Corp America, w83627sf Datasheet - Page 43

• Manufacturer Part Number: w83627sf
• Description: Winbond I/o
• Manufacturer: Winbond Electronics Corp America

3.2
There are several status, data, and control registers in W83627SF. These registers are defined below:
3.2.1
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.
DRV2# (Bit 6):
0
1
STEP (Bit 5):
This bit indicates the complement of STEP# output.
TRAK0# (Bit 4):
This bit indicates the value of TRAK0# input.
A second drive has been installed
A second drive has not been installed
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
Register Descriptions
Status Register A (SA Register) (Read base address + 0)
ADDRESS
OFFSET
7
6
5
DT (FIFO) REGISTER
4
SB REGISTER
MS REGISTER
SA REGISTER
TD REGISTER
DI REGISTER
3
READ
2
- 36 -
1
0
REGISTER
DIR
INDEX
WP
HEAD
TRAK0
STEP
INIT PENDING
DRV2
Publication Release Date: Nov. 2000
DT (FIFO) REGISTER
DO REGISTER
DR REGISTER
CC REGISTER
TD REGISTER
WRITE
PRELIMINARY
W83627SF
Revision 0.60