IBM DJSA-210 Hard Drive Specifications - Page 81

Data Register, 6 Device Control Register - software

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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 Device Control Register 7 6 5 4 3 2 1 0 - - - - 1 SRST -IEN 0 Figure 50. 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. Travelstar 32GH/30GT/20GN hard disk drive specifications 67

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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
0
0
1
–IEN
2
SRST
3
1
4
–
5
–
6
–
7
–
Device Control Register
Figure 50. Device Control Register
Bit Definitions
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.
-IEN
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.
SRST (RST)
Travelstar 32GH/30GT/20GN hard disk drive specifications
67