Ciprico Rimfire 3880 User Manual download pdf (Page 88)

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.

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.

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.

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.

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.

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.

0 ⇒ Normal operation.

1 ⇒ DIR and DAT values in the Flag byte are valid and override the defaults.

BITS

76543210

DBV 0 ICC 0 IRS DAT DIR 0

Table 27: Bit-meanings of Flags-1 Field

1 2 ... 83 84 85 86 87 88 89 90 91 92 93 ... 229 230

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