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SET MULTIPLE MODE (X'C6')
This command enables the device to perform the READ MULTIPLE and WRITE MULTIPLE
commands. The block count (number of sectors in a block) for these commands are also
specified by the SET MULTIPLE MODE command.
The number of sectors per block is written into the Sector Count register. The IDD supports 2,
4, 8 and 16 (sectors) as the block counts.
Upon receipt of this command, the device sets the BSY bit of the Status register and checks
the contents of the Sector Count register. If the contents of the Sector Count register is valid
and is a supported block count, the value is stored for all subsequent READ MULTIPLE and
WRITE MULTIPLE commands. Execution of these commands is then enabled. If the value
of the Sector Count register is not a supported block count, an ABORTED COMMAND error
is posted and the READ MULTIPLE and WRITE MULTIPLE commands are disabled.
If the contents of the Sector Count register is 0 when the SET MULTIPLE MODE command
is issued, the READ MULTIPLE and WRITE MULTIPLE commands are disabled.
When the SET MULTIPLE MODE command operation is completed, the device clears the
BSY bit and generates an interrupt.
At command issuance (I/O registers setting contents)
1F7
(CM)
H
1F6
(DH)
H
1F5
(CH)
H
1F4
(CL)
H
1F3
(SN)
H
1F2
(SC)
H
1F1
(FR)
H
At command completion (I/O registers contents to be read)
1F7
(ST)
H
1F6
(DH)
H
1F5
(CH)
H
1F4
(CL)
H
1F3
(SN)
H
1F2
(SC)
H
1F1
(ER)
H
After power-on or after hardware reset, the READ MULTIPLE and WRITE MULTIPLE
command operation are disabled as the default mode.
1
1
0
0
DV
xx
xx
xx
Sector count/block
xx
Status information
DV
xx
xx
xx
Sector count/block
Error information
C141-E072-01EN
0
1
1
0
xx
xx
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