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User’s Guide 21020285 D
Chapter 6 Target Mode Pass-through Commands
Command Operation Page 6 - 9
Sequence of
Events—
Responding to
an Initiator
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.
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.
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.