Scsi Command Descriptor Block; Status Block - Adaptec AHA-1740A Technical Reference Manual

EISA-to-Fast SCSI Host Adapter

SCSI Command Descriptor Block

This 6-, 10-, or 12-byte field contains the actual CDB to be sent to the target during
command phase.

Status Block

The status block is a 32-byte structure created in shared memory by software in the
system unit. Information is placed into this structure by the host adapter to report
completion status of a control block.
F E D
Target Status
CDB Byte 1
CDB Byte 3
CDB Byte 5
Fields that are empty are reserved and should be set to zero.
C B A 9 8
Status Word
Residual Byte Count
Residual Buffer Address
Additional Status Length
Enhanced Mode Firmware Description
7 6 5 4 3
HA Status
Sense Length
CDB Byte 0
CDB Byte 2
CDB Byte 4
2 1 0 Byte
Offset
00
02
04
06
08
0A
0C
0E
10
12
14
16
1A
1C
1E
6-13