User Manual

Interfacing With the Open SCSI I/O Process (IOP)
Open SCSI for Fibre Channel Controller Integrator’s Manual for HP Integrity NonStop NS-Series Servers—
3-10
The CAM Control Block (CCB)
CAM-Flag Bits
The CCB field of the WRITEREAD buffer includes a 4-byte CAM-flag field. Table 3-2
shows the bits in the CAM flag field and indicates which ones are supported by the
Open SCSI interface.
81 (Reserved — used by HP) -
82 Set I/O Characteristics (See Table 3-3
on page 3-12.) Yes
83-FF (Reserved for vendor-unique values.) -
* In the current implementation, the application or peripheral driver must cancel outstanding requests before
issuing a Reset SCSI Device operation.
Table 3-2. Cam-Flag Bits (page1of2)
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
6 Initiate synchronous transfers
1 = Initiates
0 = No effect
Yes Supported only with
the Set I/O
Characteristics
operation.
Table 3-1. CAM Operations (page2of2)
CAM Operation
Code
(in hex) Description
Supported by
Open SCSI?