Deskstar 7K500 and Deskstar E7K500 Hard Disk Drive Specification
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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
76543210
HOB---1SRST -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 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.
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