NCT6627UD Nuvoton Technology Corporation of America, NCT6627UD Datasheet - Page 112

• Manufacturer Part Number: NCT6627UD
• Manufacturer: Nuvoton Technology Corporation of America

Specifications of NCT6627UD

• Lead Free Status / Rohs Status: Supplier Unconfirmed

9.2
There are several status, data, and control registers in the W83627UHG. These registers are defined below, and
the rest of this section provides more detail about each one of them.
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:
Result
DEFAULT
9.2.1 Status Register A (SA Register) (Read base address + 0)
BIT
NAME
PHASE
7
6
5
4
BIT
Register Descriptions
base address + 0
base address + 1
base address + 2
base address + 3
base address + 4
base address + 5
base address + 7
ADDRESS
INIT PENDING. Indicates the value of the floppy disk interrupt output.
DRV2#.
0: A second drive has been installed.
1: No second drive is installed.
STEP. Indicates the complement of the STEP# output.
TRAK0#. Indicates the value of the TRAK# input.
OFFSET
PENDING
R/W
R
INIT
7
0
D7
DRV 2#
6
0
-------------------- ST0 ----------------------
D6
D5
DT (FIFO) REGISTER
STEP
NA
5
SB REGISTER
MS REGISTER
SA REGISTER
TD REGISTER
DI REGISTER
D4
Table 9-2 FDC Registers
READ
D3
TRAK0#
DESCRIPTION
4
1
D2
D1
HEAD
-103-
REGISTER
NA
3
W83627UHG/NCT6627UD
D0
INDEX#
ST0 = 80H
DT (FIFO) REGISTER
Publication Release Date: October 26, 2010
2
1
DO REGISTER
DR REGISTER
CC REGISTER
TD REGISTER
WRITE
WP#
REMARKS
1
1
DIR
NA
0
Revision 1.7