IBM IC25N020ATDA04 Hard Drive Specifications - Page 87
Data Register, 6 Device Control Register, Bit Definitions, SRST RST
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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 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. Travelstar 48GH, 30GN & 15GN hard disk drive specifications 73