Hitachi HUS154530VLF400 User Manual
Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
105
18.2.1 FCP_CMND
The FCP_CMND IU carries either a SCSI command to be executed or a Task Management function to be performed.
Table 89: FCP_CMND payload
18.2.1.1 FCP_LUN
The FCP_LUN field identifies the logical unit number within the Target. The drive is a single LUN with address 0000 0000
0000 0000h.
0000 0000h.
18.2.1.2 FCP_CNTL
The FCP_CNTL field contains a number of control flags.
Table 90: FCP_CNTL field
The Task Codes field contains the Task Attributes, as shown in Table 91. The Task Attributes are described in 18.3, “Task
Attributes”, on page 109.
Attributes”, on page 109.
Table 91: Task Attribute values
Byte Field
Description
Size
(Bytes)
0
-7
FCP_LUN
Logical Unit Number
8
8-11
FCP_CNTL Control
Field
4
12
-
27
FCP_CDB
SCSI Command Descriptor Block
16
28-31
FCP_DL Data
Length
4
Byte Description
Size
(Bytes)
0
Reserved 1
1
Task Codes
1
2
Task Management function flags
1
3
Execution management codes
1
Value Attribute
xxxx x000b
Simple_Q
xxxx x001b
Head_of_Q
xxxx x010b
Ordered_Q
xxxx x100b
ACA_Q (not supported)
xxxx x101b
Untagged