Datasheet

Travelstar 80GN Hard Disk Drive Specification

10.4 Device Control Register

Table 39: Device Control Register

10.5 Drive Address Register

Table 40: Drive Address Register

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

76543210

HOB - - - 1 SRST -IEN 0

Bit Definitions

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

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.

76543210

HIZ WTG -H3 -H2 -H1 -H0 -DS1 -DS0

Bit Definitions

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.