Command Descriptor Block Control Field-Field Descriptions - Maxtor Atlas 10K V Product Manual

Table 5-5 contains a description of the CDB control field.
Table 5-5

Command Descriptor Block Control Field-Field Descriptions

Field Description
Vendor Specific Bits These bits must be 0.
NACA Normal Auto-Contingent Allegiance - This bit must be zero to indicate that
SCSI-2 Contingent Allegiance rules apply.
Link Bit A Link bit set to one signals that the initiator requests continuation of a task
(I/O Process) across two or more SCSI commands. If the Link bit is one and the
flag bit is zero, and the command completes successfully, the drive will continue
the task and return a status of INTERMEDIATE and a service response of
Linked Command Complete.
If the Link bit and the Flag bit of the Control word are both set to one, and the
drive completes a command with a status of INTERMEDIATE, the drive will
return a service response of Linked Command Complete (with Flag). Refer to
Section 5.4 for Linked Commands description.
Flag Bit The Flag bit is used in conjunction with the Link Bit to notify the initiator in
an expedient manner that a command has been completed. Aflag bit set to 1 is
valid only when the Link Bit is set to 1.
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