Emerson MVME147 manual Custom Scsi Packets

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CUSTOM SCSI PACKETS

second command. The following linked command example may be performed on the Archive 2150 disk controller (it supports linked commands). The SCSI firmware does not support linked command with flag.

PACKET FOR THE LINKED COMMAND EXAMPLE:

PACKET DC.W		$0400 CONTROLLER LEVEL=4, DEVICE LUN=0
DS.W	1	RETURNED STATUS WORD (BYTES 0 AND 1)+2
DC.L	LSCRIPT SCRIPT POINTER		+4
DC.L	CT1	COMMAND TABLE POINTER		+8
DC.W	0	RESERVED	+C
DC.W	0	INITIATOR ROLE CUSTOM SEQUENCE +E
DC.W	0	RESERVED	+10
DC.W	0	RESERVED	+12
DC.W $001C		FUNCTION CODE=CUSTOM SCSI SEQUENCE +14
DC.W	$0260	INTERRUPT LEVEL 2, VECTOR $60		+16
DS.W	1	STATUS BYTES 2 AND 3	+18
DC.W	3	RETRY COUNT=3	+1A

SCRIPT for a READ followed by a WRITE:

LSCRIPT DC.B $14 MESSAGE OUT (IDENTIFY)

DC.B $04 COMMAND (READ)

DC.B $0C DATA IN

DC.B $10 STATUS

DC.B $18 MESSAGE IN

DC.B $04 COMMAND (WRITE)

DC.B $08 DATA OUT

DC.B $10 STATUS

DC.B $18 MESSAGE IN

DC.B $00 END OF SCRIPT

(LINKED COMMANDS REQUIRE AS MANY COMMAND TABLES AS THERE ARE PIECES OF THE

LINKED COMMAND. I.E. FOR A READ/WRITE LINKED COMMAND, 2 TABLES ARE REQUIRED)

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