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C141-E090-01EN 5 - 19
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
Status readStatus readStatus read
Command Issue
BSY
INTRQ
DRDY
~
Parameter
Write
9
5 6 7 8
1 2 3 4
Partial
block
Block
Block
Sector
transferred
DRQ
Figure 5.1 Execution example of READ MULTIPLE command
At command issuance (I/O registers setting contents)
1F7
H
(CM) 1 1 0 0 0 1 0 0
1F6
H
(DH)
×
L
×
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
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status 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 No. [MSB] / LBA
End cylinder No. [LSB] / LBA
End sector No. / LBA [LSB]
00
H
(*1)
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.