Control Byte; Table 6-4 Control Byte - Sun Microsystems storagetek sl500 Reference Manual

Control Byte

The control byte is the last byte of every Command Descriptor Block and has the
following structure:

TABLE 6-4 Control Byte

Byte 7
5, 9, or 12 Vendor Specific
Vendor Specific
■
Provides additional information about the device or for a command.
NACA
■
The normal auto contingent allegiance bit controls the rules for handling an auto
contingent condition caused by a command. This bit is set to 0 to indicate that if
a contingent allegiance condition occurs, the command will return a check
condition.
Flag (not supported)
■
This bit causes an interrupt in the initiator allowing a device to respond with
intermediate status. This bit is not supported and should be 0.
Link (not supported)
■
Allows devices that support command linking to continue the I/O process. This
bit is not supported and should be 0.
96122 • Revision: F
6 5 4
Reserved
Implementation Requirements
Bit
3 2
NACA
(0)
Chapter 6 SCSI Commands 87
1 0
Flag Link
(0) (0)