Fujitsu MPF3XXXAH manual Command descriptions, Lba Lsb

5.3.2Command descriptions

The contents of the I/O registers to be necessary for issuing a command and the example indication of the I/O registers at command completion are shown as following in this subsection.

Example: READ SECTOR(S)

At command issuance (I/O registers setting contents)

Bit	7	6	5	4		3	2	1	0
1F7H(CM)	0	0	1	0	0		0	0	0
1F6H(DH)	×	L	×	DV		Head No. / LBA [MSB]
1F5H(CH)		Start cylinder address [MSB] / LBA
1F4H(CL)		Start cylinder address [LSB]					/ LBA
1F3H(SN)		Start sector No.					/ LBA [LSB]
1F2H(SC)			Transfer sector count
1F1H(FR)					xx

At command completion (I/O registers contents to be read)

Bit	7	6	5		4	3	2	1	0
1F7H(ST)				Error information
1F6H(DH)	×	L	×		DV	End Head No. / LBA [MSB]
1F5H(CH)		End cylinder address [MSB] / LBA
1F4H(CL)		End cylinder address [LSB]					/ LBA
1F3H(SN)		End sector No.					/ LBA [LSB]
1F2H(SC)					X‘00’
1F1H(ER)				Error information
CM: Command register			FR: Features register
DH: Device/Head register			ST: Status register
CH: Cylinder High register			ER: Error register
CL: Cylinder Low register			L: LBA (logical block address) setting bit
SN: Sector Number register			DV: Device address. bit
SC: Sector Count register			x, xx: Do not care (no necessary to set)

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