Chapter 6 Target Mode Pass-through Commands
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| Overview of Target Mode |
What must the adapter accomplish in Target Mode?
There are special commands, setup rules and status involved with Target Mode that are necessary to accomplish the work required of the adapter:
The adapter must provide a means to inform the Host that it has been selected by an initiator.
Few responses of the adapter are
For more information about the Target Mode Enable command, see Chapter 7,
For more information about the Target Selection Data Structure, see page 6 - 10.
The adapter must have a means for the Host to communicate appropriate responses for the adapter to use.
By use of a command similar to the Initiator
For more information about the Target Mode Response command, refer to page 6 - 15.
The adapter must have a means of communicating status back to the Host.
As it does as an initiator, the RF3880 operating in Target Mode returns a Status Block to the Host when an operation completes. Depending on the command and how it completed, the Status Block returned may contain additional information from the Initiator.
For more information about the Status Blocks returned in Target Mode, refer to page 6 - 19.
The adapter must have a means of handling SCSI protocol issues.
The SCSI protocol is flexible in allowing a variety of negotiations to occur between initiator and target. Tagged Queuing, wide and/or synchronous transfers, response to other messages, and transmission errors all must be handled according to the specification to allow for compatibility. The RF3880 passes message decisions to the Host for processing except:
For more information about the adapter handling of SCSI protocol details, see Chapter 8, Details of Usage.
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