Ciprico Rimfire 3880 Manuel D’Utilisation
21020285 D
User’s Guide
Chapter 5 Initiator Mode Pass-through Commands
Page 5 - 4
Initiator Pass-through Parameter Block Format
Flags-1
The Flags-1 byte controls the command operation. Its bits have these meanings:
Note
Bits 7, 2 and 1 work
intra-dependently. They
are automatically set by
the adapter to specific
values for standard SCSI
and SCSI-2 command.
Their values are
described in Table 25 on
page 5 - 3.
Bits 7, 2 and 1 work
intra-dependently. They
are automatically set by
the adapter to specific
values for standard SCSI
and SCSI-2 command.
Their values are
described in Table 25 on
page 5 - 3.
DIR Direction of Data Transfer
- Both the DBV and the DAT bits must be
set to 1 for this bit to have meaning for an RF3880 operation. Otherwise its
value is ignored.
value is ignored.
0
⇒
Data transfer is from the target.
1
⇒
Data transfer is to the target.
DAT Data Transfer
- This bit is available to be used to enhance efficiency
of vendor-unique commands. (It is automatically set for standard commands.)
If the command you are issuing is vendor-unique, this bit informs the adapter
that a data-in or data-out phase will occur during the command.
If the command you are issuing is vendor-unique, this bit informs the adapter
that a data-in or data-out phase will occur during the command.
0
⇒
Command has no data phase.
1
⇒
Data phase will occur.
IRS Inhibit Request Sense
- Selects whether Sense Data is to be gathered
automatically by the adapter (in response to a Check Condition status from a
device) or given to the host to do so.
device) or given to the host to do so.
0
⇒
Automatic Request Sense issued to device reporting Check Condition.
1
⇒
Check Condition status of device reported to Host. Host must request the
device status.
ICC Inhibit Command Complete Interrupt
- Inhibits the interrupt that
notifies the host of command completion. By inhibiting interrupts for a number
of commands and then enabling an interrupt for one, you can reduce the number
of interrupts to service.
of commands and then enabling an interrupt for one, you can reduce the number
of interrupts to service.
0
⇒
Interrupts enabled for this command.
1
⇒
Interrupts inhibited for this command.
DBV Data Bits Valid
- Use this bit when you wish to override the default
values of the DAT and DIR bits to implement vendor-unique commands or
alter those automatically set for standard SCSI as shown in Table 25 on page
5 - 3.
alter those automatically set for standard SCSI as shown in Table 25 on page
5 - 3.
0
⇒
Normal operation.
1
⇒
DIR and DAT values in the Flag byte are valid and override the defaults.
BITS
7
6
5
4
3
2
1
0
DBV
0
ICC
0
IRS
DAT
DIR
0
Table 27: Bit-meanings of Flags-1 Field