Open SCSI Integrator's Manual for NonStop S-Series Servers

The Open SCSI I/O Process (IOP)
Open SCSI Integrator’s Manual for NonStop Servers—422988-002
4-10
The CAM Control Block (CCB)
CAM-Flag Bits
The CCB field of the WRITEREAD buffer includes a 4-byte CAM-flag field. Table 4-2
shows the bits in the CAM flag field, and which ones are supported by the Open SCSI
interface:
80 (Reserved — used by HP) -
81 (Reserved — used by HP) -
82 Set I/O Characteristics (see Table 4-3 on
page 4-12)
Yes
83-FF (Reserved for vendor-unique values) -
* In the current implementation, which uses PMF CRUs or IOMF CRUs, the application or peripheral driver
must cancel outstanding requests before issuing a Reset SCSI Device operation.
Table 4-2. Cam-Flag Bits (page 1 of 2)
Flag
Byte Bits Description
Supported
by Open
SCSI
IOP? Notes
1 7-6 Direction
00 = Reserved
01 = Read (data transferred to
memory)
10 = Write (data transferred from
memory)
11 = No transfer of data
Yes
5 Disable autosense No
4 Scatter/gather No
3 Disable callback on completion No
2 Linked command descriptor block
(CDB)
No
1 Tagged queue action enable No
0 CDB is a pointer No
2 7 Disable disconnect (during SCSI data
transfer):
1 = Disable disconnect
0 = Enable disconnect
Yes
Table 4-1. CAM Operations (page 2 of 2)
CAM Operation
Code
(in hex) Description
Supported by
Open SCSI?