Emerson MVME147 manual Target Role Routines

6

TARGET ROLE ROUTINES

v u	= vendor unique
-	= reserved
f	= flag
l	= link
	The operation code of $0A is for the SEND command. The LUN should match
	the logical unit for the MVME147 TARGET. The transfer length tells you how
	many bytes are going to be exchanged during the data-out phase.
	The flag and link bits are handled by the firmware and you only have to load
	a "INTERMEDIATE STATUS/GOOD STATUS" if the link bit was set and a
	"GOOD STATUS" if the link bit was clear. If the link bit is set, you load a
	"LINKED COMMAND COMPLETE" message into the message-in buffer. If
	both the link and flag bits are set, you load a "LINKED COMMAND
	COMPLETE WITH FLAG" message into the message-in buffer. If neither the
	link nor the flag bits are set, you should load a "COMMAND COMPLETE"
	message-into the message-in buffer. (The status byte is part of the command
	table -- word $14. The message-in buffer is pointed to by words $20 and $22
	of the command table.) (Link and flag features not supported on the first
	release of the TARGET module.)
	STEP 2: Script Preparation
	The SEND command requires the following script:
$08	: DATA-OUT PHASE
$10	: STATUS PHASE
$18	: MESSAGE-IN PHASE
$1C	: END OF TARGET SCRIPT

Note

The SCSI firmware automatically performs the arbitration and reselection of the disconnected initiator. The IDENTIFY message is also automatically sent to the disconnected initiator, therefore, the initial message-in phase should not be in the script for a SEND command.

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