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4.1.6 CONTROL BYTE
The control byte is the last byte of the CDB.
Bit
Byte
0
Vendor Unique
The host computer should set the Vendor Unique bits of control byte to 0 since
these bits for certain commands may be used to test the drive during the
manufacturing process.
If the Link bit is set to 1, and if the command terminates successfully, the
controller sends the following message to the host computer according to Flag bit.
Flag bit = 0 --- LINKED COMMAND COMPLETE
Flag bit = 1 --- LINKED COMMAND COMPLETE (WITH FLAG)
If the command terminates abnormally, regardless of Flag bit, the controller sends
COMMAND COMPLETE message.
If the Link bit is set to 0, the host computer shall set Flag bit to 0. If it is violated,
the controller returns CHECK CONDITION status with ILLEGAL REQUEST
sense key.
If the Link bit is set to 1, and if the command terminates successfully, the
controller returns INTERMEDIATE status and then sends one of above messages
to the host computer according to Flag bit.
The controller immediately goes to COMMAND phase from MESSAGE IN phase.
4.1.7 RESERVED
The host computer must set any reserved bits, fields, or bytes of the CDB and
parameter list to 0. If this condition is violated, the controller creates the
CHECK CONDITION status with ILLEGAL REQUEST sense key.
4 SCSI COMMANDS
Table 4.5 Control Byte Format
7
6
5
4
3
2
Reserved
Revision: 1 / Date: 2003.03.06
OEM MANUAL:K6602924
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