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10.8.21 Write Multiple EXT (39h)
COMMAND CODE
0 0 1 1 1 0 0 1
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
LBA
Low
Current
Previous
LBA(7:0)
LBA(31:24)
HOB=0
HOB=1
last address
last address
LBA
Mid
Current
Previous
LBA(15:8)
LBA(39:32)
HOB=0
HOB=1
last address
last address
LBA
High
Current
Previous
LBA(23:16)
LBA(47:40)
HOB=0
HOB=1
last address
last address
SC Current
Previous
sector count(7:0)
sector count(15:8)
HOB=0
HOB=1
00H
00H
FT Current
Previous
reserved
reserved
HOB=0
HOB=1
no change
no change
This command is basically identical to Write Multiple command except register setting.
This command is available in LBA addressing only.
10.8.22 Set Multiple Mode (C6h)
COMMAND CODE
1 1 0 0 0 1 1 0
REGISTER
REGISTER SETTING NORMAL COMPLETION
DR drive no. no change
CY no change
HD no change
SN no change
SC The number of sectors / block no change
FT no change
This command enables the drive to perform Read and Write Multiple operations and sets the block count for
these commands.
The Sector Count Register is loaded with the number of sectors per block. The drive supports 1,2,4,8 or16
sectors per block.
Upon receipt of the command, the drive sets BSY=1 and checks the content of Sector Count Register.
If the Sector Count Register contains a valid value and the block count is supported, the value is loaded for
all subsequent Read Multiple and Write Multiple commands. And these commands are enabled to be
executed. If a block count is not supported , this command shall be terminated with the report of an Aborted
Command error , and Read Multiple and Write Multiple commands are disabled.
If the Sector Count Register contains 0 when the command is issued, Read Multiple and Write Multiple
commands are disabled.
In case of software reset, the result depends on the setting of Set Feature command. If FT=66h, the mode
is not changed. If FT = CCh, the mode reverts to power on default (16 sectors).