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CUSTOM SCSI PACKETS
2-6
2
Scripts only specify the information transfer phases. The bus free, arbitration,
and selection phases do not need to be specified in a script. The script codes
that are understood by the MVME147 SCSI firmware are listed in the
following table. (Note that TARGET role scripts are described in the Target
Sequence Custom Packet section in this chapter.
Message
out
initiator
to TARGET
Messages are sent to the TARGET to send bus,
command, and controller information.
Examples: identify, initiator detected error,
abort, device reset.
CODE
BUS PHASES ROLE
$00 END OF SCRIPT Initiator
DISCONNECT TARGET
$04 COMMAND PHASE Initiator and TARGET
$08 DATA-OUT PHASE Initiator and TARGET
$0C DATA-IN PHASE Initiator and TARGET
$10 STATUS PHASE Initiator and TARGET
$14 MESSAGE-OUT PHASE Initiator and TARGET
$18 MESSAGE-IN PHASE Initiator and TARGET
$1C END OF SCRIPT TARGET
NOT DEFINED Initiator
$20 TARGET WAIT, TARGET
NO DISCONNECT
$24 TARGET WAIT, TARGET
DISCONNECT
$28 TARGET WAIT, TARGET
NO DISCONNECT
DATA RECEIVED
$2C TARGET WAIT, TARGET
DISCONNECT
DATA RECEIVED
PHASE
DIRECTION NOTES