5.3 Host Commands
At command issuance (I/O registers setting contents)
1F7H(CM) | 0 | 0 | 1 | 1 | 1 | 1 | 0 | 0 |
1F6H(DH) | x | L | x | DV | Start head No. / LBA |
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1F5H(CH) | Start cylinder No. [MSB] / LBA |
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1F4H(CL) | Start cylinder No. [LSB] / LBA |
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1F3H(SN) | Start sector No. / LBA [LSB] |
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1F2H(SC) | Transfer sector count |
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1F1H(FR) | xx |
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At command completion (I/O registers contents to be read)
1F7H(ST) | Status information |
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1F6H(DH) | x |
| L | x | DV | End head No. / LBA [MSB] |
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1F5H(CH) | End cylinder No. [MSB] / LBA | |||||
1F4H(CL) | End cylinder No. [LSB] / LBA | |||||
1F3H(SN) | End sector No. / LBA [LSB] | |||||
1F2H(SC) | 00 (*1) |
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1F1H(ER) | Error information |
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*1 If the command is terminated due to an error, the remaining number of sectors of which data was not transferred is set in this register.
(9) RECALIBRATE (X’1x’, x: X’0’ to X’F’)
This command performs the calibration. Upon receipt of this command, the device sets BSY bit of the Status register and performs a calibration. When the device completes the calibration, the device updates the Status register, clears the BSY bit, and generates an interrupt.
This command can be issued in the LBA mode.
