Figure 5.1 shows an example of the execution of the READ MULTIPLE command.

Block count specified by SET MULTIPLE MODE command = 4 (number of sectors in a block)

READ MULTIPLE command specifies;

Number of requested sectors = 9 (Sector Count register = 9)

Number of sectors in incomplete block = remainder of 9/4 =1

Command Issue

Parameter

 

 

 

Write

Status read

Status read

Status read

~

BSY

DRDY

INTRQ

DRQ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Sector

1

2

3

4

 

5

6

7

8

 

9

 

 

 

 

 

 

 

 

 

 

transferred

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Partial

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

block

 

 

 

 

Block

 

 

 

 

 

Block

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5.1 Execution example of READ MULTIPLE command

At command issuance (I/O registers setting contents)

1F7H(CM)

1

1

0

0

0

1

0

0

 

 

 

 

 

 

 

1F6H(DH)

×

L

×

DV

 

Start head No. /LBA [MSB]

 

 

 

 

 

 

 

 

1F5H(CH)

 

Start cylinder No. [MSB]/ LBA

 

 

1F4H(CL)

 

Start cylinder No. [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)

1F7H(ST)

 

 

 

Status information

 

 

 

 

 

 

 

1F6H(DH)

×

L

×

 

DV

End head No. /LBA [MSB]

 

 

 

 

 

 

1F5H(CH)

 

End cylinder No. [MSB] / LBA

1F4H(CL)

 

End cylinder No. [LSB]

/ LBA

1F3H(SN)

 

End sector No.

/ LBA [LSB]

1F2H(SC)

 

 

 

 

00H (*1)

 

1F1H(ER)

 

 

 

Error information

*1 If the command is terminated due to an error, the remaining number of sectors for which data was not transferred is set in this register.

C141-E099-01EN

5 - 19

Page 84
Image 84
Fujitsu MPF3XXXAT manual BSY Drdy Intrq DRQ, Execution example of Read Multiple command