Hitachi ULTRASTAR 15K450 HUS154530VLF400 - Manual (Page 124)

Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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18.2.4.1 FCP_STATUS
The FCP_STATUS field is normally zero upon successful completion of an IOP.
Table 95: FCP_STATUS field
The Flags field contains the following:
Bits 7-4 - Reserved
Bit 3 - FCP_RESID_UNDER
When set to one, this flag indicates that the FCP_RESID field is valid and contains a count of the number of bytes
that were expected but not received.
Bit 2 - FCP_RESID_OVER
When set to one, this flag indicates that the FCP_RESID field is valid and contains a count of the number of bytes
that could not be transferred because FCP_DL was not sufficient.
Bit 1 - FCP_SNS_LEN_VALID
When set to one, this flag indicates that the FCP_SNS_LEN field is valid and contains a count of the number of bytes
in the FCP_SNS_INFO field.
Bit 0 - FCP_RSP_LEN_VALID
When set to one, this flag indicates that the FCP_RSP_LEN field is valid and contains a count of the number of bytes
in the FCP_RSP_INFO field.
The SCSI Status byte field is defined in 20.0, “SCSI Status Byte”, on page 307.
18.2.4.2 FCP_RESID
This field contains a count of the number of residual data bytes that were not transferred for this SCSI command.
18.2.4.3 FCP_SNS_LEN
This field contains a count of the number of valid bytes in the FCP_SNS_INFO field.
18.2.4.4 FCP_RSP_LEN
If the FCP_RSP_LEN_VALID flag in the FCP_STATUS field is set to 1b, this field contains a count of the number of valid
bytes in the FCP_RSP_INFO field.
Valid values are 0, 4, and 8.
Byte Description Size (Bytes)
0-1 Reserved 2
2 Flags 1
3 SCSI Status byte 1