Travelstar 7K100 Hard Disk Drive Specification
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10.4 Device
Control Register
Table 40: Device Control Register
10.5 Drive Address Register
Table 41: Drive Address Register
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
Bit
Definitions
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 (RST)
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
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-
-Head Select. These four bits are the one's complement of the binary coded address of the cur-
rently 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.
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