W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 150

• Manufacturer Part Number: W83627DHG-PT
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of W83627DHG-PT

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

11.2 Register Descriptions
There are several status, data, and control registers in the W83627DHG-P. These registers are
defined below, and the rest of this section provides more details about each one of them.
11.2.1 Status Register A (SA Register) (Read base address + 0)
Along with the SB register, the SA 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:
DEFAULT
NAME
BIT
7
6
5
4
3
2
1
0
BIT
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
ADDRESS
INIT PENDING. This bit indicates the value of the floppy disk interrupt output.
RESERVED.
STEP. This bit indicates the complement of the STEP# output.
TRAK0#. This bit indicates the value of the TRAK0# input.
HEAD. This bit indicates the complement of the HEAD# output.
0: Side 0.
1: Side 1.
INDEX#. This bit indicates the value of INDEX# output.
WP#.
0: The disk is write-protected.
1: The disk is not write-protected.
DIR. This bit indicates the direction of head movement.
0: Outward direction.
1: Inward direction.
OFFSET
PEDNDING
INIT
7
0
RESERVED
6
0
Table 11-2 FDC Registers
DT (FIFO) REGISTER
STEP
SB REGISTER
NA
MS REGISTER
SA REGISTER
TD REGISTER
DI REGISTER
5
W83627DHG-P/W83627DHG-PT
READ
DESCRIPTION
-140-
TRAK0#
4
1
REGISTER
HEAD
NA
3
Publication Release Date: July 09, 2009
INDEX#
DT (FIFO) REGISTER
2
1
DO REGISTER
DR REGISTER
CC REGISTER
TD REGISTER
WRITE
WP#
1
1
Version 1.94
DIR
NA
0