5.3 Host Commands
C141-E192-01EN 5-29
At command issuance (I/O registers setting contents)
1F7H(CM)00111100
1F6H(DH) x L x DV Start head No. / LBA
[MSB]
1F5H(CH)
1F4H(CL)
1F3H(SN)
1F2H(SC)
1F1H(FR)
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No. / LBA [LSB]
Transfer sector count
xx
At command completion (I/O registers contents to be read)
1F7H(ST) Status information
1F6H(DH) x L x DV End head No. / LBA [MSB]
1F5H(CH)
1F4H(CL)
1F3H(SN)
1F2H(SC)
1F1H(ER)
End cylinder No. [MSB] / LBA
End cylinder No. [LSB] / LBA
End sector No. / LBA [LSB]
00 (*1)
Error information
*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’10’ to X’1F’)
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.