W83627DHG-PT Nuvoton Technology Corporation of America, W83627DHG-PT Datasheet - Page 156

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

Specifications of W83627DHG-PT

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

11.2.7 FIFO Register (R/W base address + 5)
The FIFO register consists of four status registers in a stack, and only one register is presented to the
data bus at a time. The FIFO register stores data, commands, and parameters, and it provides disk-
drive status information. In addition, data bytes pass through the data register to program or obtain
results after a command. In the W83627DHG-P, this register is disabled after reset. The FIFO can
enable it and change its values through the configure command.
Status Register 0 (ST0)
BIT
7-6
NAME
5
4
3
2
1
0
BIT
IC. Interrupt Code.
Bits
7 6
0 0: Normal termination of command.
0 1: Abnormal termination of command.
1 0: Invalid command issue.
1 1: Abnormal termination because the ready signal from FDD changes state during
command execution.
SE. Seek Mode.
1: Seek end.
0: Seek error.
EC. Equipment Check.
1: When a fault signal is received form the FDD or the track.
0: The signal fails to occur after 77 step pulses.
NR. Not Ready.
0: Drive is not ready.
1: Drive is ready.
HD. Head Address.
0: Head selected.
1: Head selected.
US1 DRIVE SELECT.
US0 DRIVE SELECT.
7
IC
6
SE
5
W83627DHG-P/W83627DHG-PT
DESCRIPTION
-146-
EC
4
Drive Select.
Bits
1 0
0 0: Drive A selected.
0 1: Reserved.
1 0: Reserved.
1 1: Reserved.
NR
3
Publication Release Date: July 09, 2009
HD
2
SELECT
DRIVE
US1
1
Version 1.94
SELECT
DRIVE
US0
0