Data Register; Device Control Register; Figure 52. Device Control Register - IBM IC25N040ATCS04 - Travelstar 40 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 re-
gister 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 52. Device Control Register

Bit Definitions
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
-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.
Drive Control Register
7 6 5
- – –
µ
Travelstar 60GH & 40GN hard disk drive specifications
4 3 2
– 1 SRST –IEN
s before setting RST = 0.
69
1 0
0