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SCSI Commands Reference Manual, Rev. J 184
www.seagate.com Direct Access Block commands (SPC-5 and SBC-4)
OPERATION CODE field
The OPERATION CODE field contains the operation code of a command supported by the logical unit and shall be set to the value defined in
table 153.
SERVICE ACTION field
The SERVICE ACTION field contains a supported service action of the supported operation code indicated by the OPERATION CODE field. If the
operation code indicated in the OPERATION CODE field does not have a service action, the SERVICE ACTION field shall be set to 00h.
Command Duration Limit Page (CDLP) field
The Command Duration Limit Page (CDLP) field (see table 154) indicates the mode page, if any, that specifies the command duration limit for
the command.
CTDP (Command Timeouts Descriptor Present) bit
0 A CTDP bit set to zero indicates that the command timeouts descriptor is not included in this command descriptor.
1 A CTDP bit set to one indicates that the command timeouts descriptor is included in this command descriptor.
SERVACTV (Service Action Valid) bit
0 A service action valid (SERVACTV) bit set to zero indicates the operation code indicated by the OPERATION CODE field does not have ser-
vice actions and the SERVICE ACTION field contents are reserved.
1 A SERVACTV bit set to one indicates the operation code indicated by the OPERATION CODE field has service actions and the contents of
the SERVICE ACTION field are valid.
CDB LENGTH field
The CDB LENGTH field contains the length of the command CDB in bytes for the operation code indicated in the OPERATION CODE field. If the
SERVACTV bit is set to one, the CDB LENGTH field contains the length in bytes of the command CDB for the OPERATION CODE/ SERVICE ACTION
combination.
RCTD (Report Command Timeout Descriptor) bit
0 If the RCTD bit is set to zero, the command timeouts descriptor shall not be included.
1 If the RCTD bit is set to one in the REPORT SUPPORTED OPERATION CODES CDB, the command timeouts descriptor shall be included.
Table 154 CDLP field
Code Description
00b No command duration limit mode page is indicated for this command
01b
a
Command Duration Limit A mode page
10b
b
Command Duration Limit B mode page
11b Reserved
a If this value is returned, the Command Duration Limit A mode page (see 5.3.10) shall be supported.
b If this value is returned, the Command Duration Limit B mode page (see 5.3.11) shall be supported.