Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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The Task Management Function flags are used to request Task Management functions, as shown in Table92. The Task Man-
agement functions are described in 18.4, “Task Management functions”, on page110.
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 Targe t Res et
0000 0100b Clear Task Set
0000 0010b Abort Task Set