HGST TRAVELSTAR 80GN 30GB ATA5 08K0910 User Manual

Travelstar 80GN Hard Disk Drive Specification

65

 

This register contains the inverted drive select and head select addresses of the currently selected drive.

7

6

5

4

3

2

1

0

HOB

-

-

-

1

SRST

-IEN

0

HOB

HOB (high order byte) is defined by the 48-bit Address feature set. A write to any Command 
Register shall clear the HOB bit to zero.

SRST

Software Reset. The device is held at reset when RST = 1. Setting RST = 0 again enables the 
device. To ensure that the device recognizes the reset, the host must set RST = 1 and wait for at 
least 5 ms before setting RST = 0.

-IEN

Interrupt Enable. When IEN = 0, and the device is selected, the device interrupts to the host will 
be enabled. When IEN = 1, or the device is not selected, the device interrupts to the host will be 
disabled.

7

6

5

4

3

2

1

0

HIZ

WTG

-H3

-H2

-H1

-H0

-DS1

-DS0

HIZ

High Impedance. This bit is not a device and will always be in a high impedance state.

-WTG

Write Gate. This bit is 0 when writing to the disk device is in progress.

-H3, -H2,-
H1,-H0-

-H3, -H2,-H1,-H0-Head Select. These four bits are the one's complement of the binary coded 
address of the currently selected head. Bit -H0 is the least significant.

-DS1

Drive Select 1. The Drive Select bit for device 1 is active low. DS1 = 0 when device 1 (slave) is 
selected and active.

-DS0

Drive Select 0. The Drive Select bit for device 0 is active low. DS0 = 0 when device 0 (master) is 
selected and active.