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C141-E106-01EN 5 - 37
(15) 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
H
(CM) 11000110
1F6
H
(DH)
×××
DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(FR)
xx
xx
xx
Sector count/block
xx
At command completion (I/O registers contents to be read)
1F7
H
(ST) Status information
1F6
H
(DH)
×××
DV xx
1F5
H
(CH)
1F4
H
(CL)
1F3
H
(SN)
1F2
H
(SC)
1F1
H
(ER)
xx
xx
xx
Sector count/block
Error information
After power-on or after hardware reset, the READ MULTIPLE and WRITE MULTIPLE
command operation are disabled as the default mode.