5.3 Host Commands
At command issuance (I/O registers setting contents)
1F7H(CM) | 0 | 1 | 1 | 1 |
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1F6H(DH) | x | L | x | DV |
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1F5H(CH) | Cylinder No. [MSB] / LBA |
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1F4H(CL) | Cylinder No. [LSB] / LBA |
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1F3H(SN) | Sector No. / LBA [LSB] |
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1F2H(SC) | xx |
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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 | Head No. / LBA [MSB] |
1F5H(CH) | Cylinder No. [MSB] / LBA | ||||
1F4H(CL) | Cylinder No. [LSB] / LBA | ||||
1F3H(SN) | Sector No. / LBA [LSB] | ||||
1F2H(SC) | xx |
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1F1H(ER) | Error information |
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(11) INITIALIZE DEVICE PARAMETERS (X’91’)
The host system can set the number of sectors per track and the maximum head number (maximum head number is “number of heads minus 1”) per cylinder with this command. Upon receipt of this command, the device sets the BSY bit of Status register and saves the parameters. Then the device clears the BSY bit and generates an interrupt.
When the SC register is specified to X’00’, an ABORTED COMMAND error is posted. Other than X’00’ is specified, this command terminates normally.
The parameters set by this command are retained even after reset or power save operation regardless of the setting of disabling the reverting to default setting.
The device ignores the L bit specification and operates with only CHS mode specification.
