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2 command descriptions – FUJITSU MPG3XXXAH-E User Manual

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C141-E116-01EN

5 - 16

5.3.2

Command 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

1F7

H

(CM)

0

0

1

0

0

0

0

0

1F6

H

(DH)

×

L

×

DV

Head No. / LBA [MSB]

1F5

H

(CH)

1F4

H

(CL)

1F3

H

(SN)

1F2

H

(SC)

1F1

H

(FR)

Start cylinder address [MSB] / LBA
Start cylinder address [LSB] / LBA
Start sector No.

/ LBA [LSB]

Transfer sector count
xx

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

Bit

7

6

5

4

3

2

1

0

1F7

H

(ST)

Error information

1F6

H

(DH)

×

L

×

DV

End Head No. / LBA [MSB]

1F5

H

(CH)

1F4

H

(CL)

1F3

H

(SN)

1F2

H

(SC)

1F1

H

(ER)

End cylinder address [MSB] / LBA
End cylinder address [LSB]

/ LBA

End sector No.

/ LBA [LSB]

X‘00’
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)