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5-94 C141-E262
(20) 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 is also specified by the SET MULTIPLE MODE
command.
The number of sectors per block is written into the Sector Count field. The IDD
supports block sizes of 1, 2, 4, 8, and 16 sectors.
Upon receipt of this command, the device checks the contents of the Sector Count
field. If the contents of the Sector Count field 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 field are 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
reports the status to the host.
In the default mode that is entered at power-on, the READ MULTIPLE and
WRITE MULTIPLE commands are enabled (block count = 10h).
• Error reporting conditions
(1) A value other than 00h, 01h, 02h, 04h, 08h, or 10h is specified in the SC field
(ST = 51h, ER = 04h).
(2) A SATA communication error occurred (ST = 51h, ER = 14h).
At command issuance (Shadow Block Registers setting contents)
CM 1 1 0 0 0 1 1 0
DH x x x x xx
CH
CL
SN
SC
FR
xx
xx
xx
Sector count/block
xx