StorageTek StorageNet SCSI-3 - Manual (Page 24)

FCP and SES Commands
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Table 3-5 shows the FCP_STATUS field format.
The reserved bits are set to 0 by the SESD. FCP_RESID_UNDER indicates that the FCP_RESID
field is valid and contains the number of bytes expected to be transferred, but were not
transferred. See
Table 3-4 . This bit is not used by SESD. FCP_RESID_OVER indicates that the
FCP_RESID field is valid and contains the number of bytes that have been truncated because
the FCP_DL was not sufficient. See Table 3-3 . This bit may be set by SESD.
FCP and SES Commands
Table 3-6 shows the commands supported by SESD.
The value of the FCP_LUN field in FCP_CMND specifies the logical unit for the request in each
command. The value of FCP_DL field in FCP_CMND specifies whether there is any data
parameter to be transferred to the SESD. The value should be 0 for command 1, 2, 3, 4 and 6.
For command 5, the value may be 0 or the size of a diagnostic page whose page code is in the
range of 80h through 85h.
Table 3-5 FCP_STATUS Format
Byte Bit Definition
0 7 .. 0 Reserved
1 7 .. 0 Reserved
2
7 .. 4 Reserved
3 FCP_RESID_UNDER
2 FCP_RESID_OVER
1 FCP_SNS_LEN_VALID
0 FCP_RSP_LEN_VALID
3 7 .. 0 SCSI status byte from the SCSI logical unit (not used)
Table 3-6 Supported Operation Codes
Command Operation Code
Inquiry 12h
Receive Diagnostics Results 1Ch
Report LUNs A0h
Request Sense 03h
Send Diagnostic 1Dh
Test Unit Ready 00h