Chapter 7 Board-control Commands

Target Mode Disable (0BH)

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Target Mode Disable (0BH)

Command

Format

Use the Target Mode Disable command when you wish the adapter to cease responding to selections from initiators on the SCSI bus. Also with this command, you can choose how the adapter will respond to selections by initiators on the SCSI bus after Target Mode is disabled.

The Parameter Block format for the Target Mode Disable command looks like this:

Address

 

Byte Memory Address

 

Offset

Offset + 0

Offset + 1

 

Offset + 2

Offset + 3

 

 

 

 

 

 

 

00H

 

Command Identifier

 

 

 

 

 

 

 

04H

Reserved

Flags-1

 

Reserved

Adapter ID = FFH

 

 

 

 

 

 

08H

 

 

Reserved

 

 

 

 

 

 

0CH

 

 

Reserved

 

10H

Command = 0BH

 

 

Reserved

 

 

 

 

 

 

 

14H

 

 

Reserved

 

 

 

 

 

 

18H

 

 

Reserved

 

 

 

 

 

 

 

Table 85: Target Mode Disable Parameter Block

Description of Fields

Each of the fields used by the Target Mode Disable command are explained in the following section:

Command Identifier

The Command Identifier is used to identify the Status Block associated with a Parameter Block. It must be a unique value.

Adapter ID

This field must contain an FFH to indicate that it is an adapter command.

Flags-1

BITS

7

6

5

4

3

2

1

0

 

 

 

 

 

 

 

 

0

0

0

0

0

0

0

RBS

Table 86: Meaning of Flags-1 Field

The Flags-1 byte contains specific controls for the operation of the Target Mode Disable command. The format is as follows:

RBS Return Busy on Selection - This bit determines how the board will respond to selection by SCSI initiators after SCSI Target Mode is disabled.

0 Respond to future selections with unexpected Bus Free.

1 Respond to future selections with Busy status and Command Complete message.

Command Code

This field indicates the command to be executed. For the Target Mode Disable command, it is always equal to 0BH.

User’s Guide

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Ciprico Rimfire 3880 manual Board-control Commands Target Mode Disable 0BH, Target Mode Disable Parameter Block