Data Register; Device Control Register; Table 59. Device Control Register - Hitachi HDS725050KLA360 Specifications

9.6 Data Register

This register is used to transfer data blocks between the device data buffer and the host. It is also the register
through which sector information is transferred on a Format Track command and the configuration information is
transferred on an Identify Device command.
All data transfers are 16 bits wide, except for ECC byte transfers, which are 8 bits wide. Data transfers are PIO
only.
The register contains valid data only when DRQ = 1 is in the Status Register.

9.7 Device Control Register

Table 60: Device Control Register
7 6
HOB -
Bit Definitions
HOB (high order byte) is defined by the 48-bit Address feature set. A write to any Command
HOB
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.
5 4 3
- - 1
Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
2 1 0
SRST -IEN 0
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