Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
106
The Task Management Function flags are used to request Task Management functions, as shown in Table 92. The Task Man-
agement functions are described in 18.4, “Task Management functions”, on page 110.
Table 92: TMF flag values
The Execution management codes field contains flags, as follows:
Bits 7-2 - Reserved
Bit 1 - Read Data
When set to one, this flag indicates that the Initiator expects FCP_DATA IUs for the task to be in the direction oppo-
site to the direction of the FCP_CMND IU. This is a SCSI READ type operation.
Bit 0 - Write Data
When set to one, this flag indicates that the Initiator expects FCP_DATA IUs for the task to be in the same direction
as the FCP_CMND IU. This is a SCSI WRITE type operation.
18.2.1.3 FCP_CDB
The FCP_CDB field contains the SCSI CDB to be executed by the addressed logical unit. This field is ignored if any of the
Task Management function flags are set.
This is a 16-byte field. Bytes beyond the end of the CDB are ignored by the Target and may have any value.
18.2.1.4 FCP_DL
The FCP_DL field contains a count of the greatest number of data bytes expected to be transferred by execution of the SCSI
CDB. An FCP_DL field of zero indicates that no data transfer is expected and that no FCP_XFER_RDY or FCP_DATA IUs
shall be transferred.
Value Function
1000 0000b Terminate Task
0100 0000b Clear ACA (not supported)
0010 0000b Target Reset
0000 0100b Clear Task Set
0000 0010b Abort Task Set
