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User’s Guide 21020285 D
Chapter 6 Target Mode Pass-through Commands
Overview of Special Target Mode Commands Page 6 - 5
Overview of
Special Target
Mode
Commands
To implement the Target Mode described in the previous pages, three new
commands and a new type of Status Block were used. These are described
briefly next so the commands will be familiar as the Sequence of Operation is
described.
New
commands
• Target Mode Enable command
• Target Mode Disable command
• Target Mode Response command
Note
For a complete
description of the Target
Mode Enable command
and the Target Mode
Disable command, see
Chapter 7. The Target
Mode Response
command is described
fully later in this chapter.
Target Mode Enable Command
When you want the adapter to begin operating in Target Mode, you must issue
a Target Mode Enable command to the adapter. This command must be issued
after the host has set up the memory for the Target Selection Data Structure
that the adapter will use. Until this command is issued, the adapter will respond
to all selection attempts by disconnecting from the SCSI bus.
Target Mode Disable Command
The Target Mode Disable command is issued when you wish to stop receiving
selections from initiators on the SCSI bus.
Target Mode Response Command
When ready with the response for the initiator that has selected the RF3880,
use the Target Mode Response command to inform the adapter what action to
perform. Target Mode Response commands are queued in the adapter for
execution in the same way as initiator commands.