Data Register; Device Control Register; Figure 55. Device Control Register - IBM IC25N020ATDA04 - Travelstar 20 GB Hard Drive Specifications

10.5 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.

10.6 Device Control Register

Figure 55. Device Control Register

Bit Definitions
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 microseconds 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.
Device Control Register
7 6 5
- - -
Travelstar 48GH, 30GN & 15GN hard disk drive specifications
4 3 2 1
- 1 SRST -IEN
73
0
0