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User’s Guide 21020285 D
Chapter 5 Initiator Mode Pass-through Commands
Initiator Pass-through Parameter Block Format Page 5 - 11
Message
Format
When you set the JSM bit in the Flags-2 field of the Pass-through Parameter
Block, the format of the Parameter Block changes:
Description of
the Fields
All fields that appear in light text above are ignored when the JSM bit of the
Flags-2 byte is set.
The Command Identifier and Target ID fields work the same as explained in
the preceding pages. The JSM bit of the Flags-2 field is the only bit in that field
that is valid.
Message Code
Currently there are three messages that are valid to appear in this field. They are:
06H - ABORT
0CH - BUS DEVICE RESET
0EH - CLEAR QUEUE
Other messages will not be passed to the device and will create an error status.
Error code returned is 01H (invalid command).
LUN
This field has the same format as specified in the SCSI specification for LUN
(Logical Unit Number); the 3 most significant bits hold the LUN value.
Address
Offset
Byte Memory Address
Offset +0 Offset +1 Offset +2 Offset +3
00H Command Identifier
04H Flags 2 Flags 1 Addr. Mod. Target ID
08H VME Memory Address
0CH Transfer Count
10H Message Code LUN 2 3
14H4567
18H 8 9 10 11
Table 33: Pass-through Message Parameter Block