Fujitsu MHW2080BS, MHW2100BS, MHW2120BS, MHW2040BS, MHW2060BS manual Command descriptions

Interface

5.3.2 Command descriptions

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

Example: READ SECTOR (S)

At command issuance

(Shadow Block Registers setting contents)

Bit	7		6		5	4	3	2	1	0
CM	0	0		1		0	0	0	0	0
DH	x		L		x	x	HD No./LBA
CH EXP					LBA(47-40)
CH			Start cylinder address
			[MSB] / LBA(23-16)
CL EXP					LBA(39-32)
CL			Start cylinder address
				[LSB] / LBA(15-8)
SN EXP					LBA(31-24)
SN		Start sector No. / LBA (7-0)
SC EXP		Transfer sector count (15-8)
SC			Transfer sector count (7-0)
FR EXP						xx
FR						xx

At command completion

(Shadow Block Registers to be read)

Bit	7	6		5		4	3	2	1	0
ST				Status information
DH	x	L		x		x	HD No./LBA
CH EXP					LBA(47-40)
CH			End cylinder address
			[MSB] / LBA(23-16)
CL EXP					LBA(39-32)
CL			End cylinder address
				[LSB] / LBA(15-8)
SN EXP					LBA(31-24)
SN		End sector No. / LBA (7-0)
SC EXP						X ' 00 '
SC						X ' 00 '
ER				Error information

CH (EXP):	Cylinder High Field (EXP)
CL (EXP):	Cylinder Low Field (EXP)
CM:	Command Field
DH:	Device/Head Field
ER:	Error Field
FR (EXP):	Features Field (EXP)

L:LBA (Logical Block Address) setting bit

SN (EXP): Sector Number Field (EXP)

SC (EXP): Sector Count Field (EXP)

ST:	Status Field
x, xx:	Don't care (setting is not necessary)
Note:

1.When the L bit is specified to 1, the lower 4 bits of the DH field and all bits of the CH field, CL and SN fields indicate the LBA bits (bits of the DH filed are the MSB (most significant bit) and bits of the SN field are the LSB (least significant bit).

2.At error occurrence, the SC field indicates the remaining sector count of data transfer.

3.Bit indication is omitted in each command description.

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