Fujitsu MHS2020AT, Product Manual

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Interface
5-20 C141-E171-03EN
At command issuance (I/O registers setting contents)
1F7
H
(CM) 0 0 1 0 0 0 0 R
1F6
H
(DH) x L x DV Start head No. / LBA
[MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
Start cylinder No. [MSB] / LBA
Start cylinder No. [LSB] / LBA
Start sector No. / LBA [LSB]
Transfer sector count
xx
(R: Retry)
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH) x L x DV End head No. / LBA [MSB]
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(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.
(2) READ MULTIPLE (X’C4’)
The READ MULTIPLE Command performs the same as the READ SECTOR(S)
Command except that when the device is ready to transfer data for a block of
sectors, and enters the interrupt pending state only before the data transfer for the
first sector of the block sectors. In the READ MULTIPLE command operation,
the DRQ bit of the Status register is set only at the start of the data block, and is
not set on each sector.
The number of sectors per block is defined by a successful SET MULTIPLE
MODE Command. The SET MULTIPLE MODE command should be executed
prior to the READ MULTIPLE command.
If the number of requested sectors is not divided evenly (having the same number
of sectors [block count]), as many full blocks as possible are transferred, then a