
Chapter 7 Board-control Commands
Target Mode Disable (0BH) | Page 7 - 29 |
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 |
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00H |
| Command Identifier |
| ||
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04H | Reserved |
| Reserved | Adapter ID = FFH | |
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08H |
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| Reserved |
| |
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0CH |
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| Reserved |
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10H | Command = 0BH |
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| Reserved |
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14H |
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| Reserved |
| |
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18H |
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| Reserved |
| |
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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.
BITS
7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
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0 | 0 | 0 | 0 | 0 | 0 | 0 | RBS |
Table 86: Meaning of Flags-1 Field
The
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 | 21020285 D |