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User’s Guide 21020285 D
Chapter 5 Initiator Mode Pass-through Commands
Initiator Pass-through Status Block Format Page 5 - 17
Selectable Sense Bytes
You also have the option to select which (up to 16) of the 256 possible Sense
bytes be returned in the Status Block and in what order they should appear.
• The Unit Options command allows you to choose 8 selectable Sense
Bytes.
• The Extended Unit Options command allows you to choose 16 selectable
Sense Bytes. You will receive multiple Status Blocks.
You can specify Selectable Sense Bytes by placing a zero in the Sense Count
field and filling each of the Selected Sense fields with the Sense Byte number
you wished returned in that field.
For example, the Sense Bytes fields of a Status Block could return the following
Sense Bytes in the following order if the Extended Unit Options command had
been used.
Status Block #1 contains the first eight bytes with the Info Bytes arranged from
LSB to MSB, and Status Block #2 returns Sense Bytes that are selected from
among the other 248 Sense Bytes, based on information in the vendor-supplied
peripheral documentation.
See Chapter 7 for more information about the Unit Options and Extended Unit
Options commands and how to set-up the Status Block Sense bytes the way
you wish.
Byte Memory Offset
Offset + 0 Offset + 1 Offset + 2 Offset + 3
Command Identifier
Reserved SCSI Status Error Flags
0123Sense Byt
in Status
Block #1
4 5 6 7
Command Identifier
Reserved SCSI Status Error Flags
56 57 12 19 Sense Byt
in Status
Block #2
122 33 12 23
Table 42: Example of Selected Sense Bytes