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Chapter 6 Target Mode Pass-through Commands
Command Operation | Page 6 - 9 |
Sequence of Events—
Responding to an Initiator
Note
Instead of sending the status and Command Complete message at step 7, the host may only have part of the data required to be transferred. If so, the Host can place Disconnect and Save Data Pointer messages in this Target Mode Response command and follow with a second Target Mode Response command containing the remaining data and the status byte and Command Complete message.
Other options are also available, see the description of the Response Control Flags field in the Target Mode Response command on page 6 - 17.
The following events must occur for the adapter to provide a response to an initiator (it is assumed that a command to start Command List operation has already been issued to the adapter):
1.The Host interprets the Target Selection Data Structure.
2.The Host writes Target Response data into a Target Mode Response command Parameter Block.
3.The Host issues the command to the RF3880. This command must be issued from a Command List.
4.The RF3880 reselects the initiator specified in the Target Response Data Structure, and performs the work requested.
5.The adapter sends the SCSI status byte and Command Complete message as specified by the Target Mode Response command.
6.The adapter returns the SCSI bus to the Bus Free phase.
7.The adapter sets completion status for the Target Mode Response command and sends a Status Block to the Host.
8.The Host receives completion status for the Target Mode Response command and determines if any further action is required.
User’s Guide | 21020285 D |