1.3Outline of Command Processing

1.3.1Single commands

Following shows single command processing examples which are the most basic operations on the SCSI bus. Furthermore, if disconnect processing is permitted, it may be accompanied by disconnect/reconnect processing during the command execution, depending on the type of command, but this operation is omitted in the following explanation. The disconnect function is described in Section 1.3.3.

1)The INIT sets the initial values for the command in the command pointer, data pointer and status pointer.

2)The INIT selects the TARG in the SELECTION phase after obtaining the SCSI bus usage in the ARBITRATION phase. After the SELECTION phase is ended, the SCSI bus control is entrusted to the TARG.

3)If the ATTENTION condition exists when the TARG responds to the SELECTION phase, the TARG executes the MESSAGE OUT phase. Normally, the INIT sends the IDENTIFY message as the initial message and specifies the device (LUN) that is the object of the operation.

4)The TARG executes the COMMAND phase and receives the CDB from the INIT. The TARG judges the length of the CDB by the group code in the first byte of the CDB and requests transfer of the necessary number of bytes.

5)The TARG investigates the contents of the command and executes the requested operation. In the case of commands for which data transfer on the SCSI bus is necessary, the DATA IN or the DATA OUT phase is executed.

6)When execution of the command is completed, the TARG reports the execution results by the status byte in the STATUS phase to the INIT.

7)The TARG reports the TASK COMPLETE message to the INIT in the MESSAGE IN phase and enters the BUS FREE phase.

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Fujitsu MAN3184, MAN3367, MAN3735 specifications Outline of Command Processing Single commands
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MAN3735, MAN3184, MAN3367, MAN3735 SERIES DISK DRIVES, MAN3367, MAN3184 specifications

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