Product manual

Barracuda 2LP Product Manual, Rev. D 59
11.0 Interface requirements
This section describes the Barracuda 2LP interface requirements.
11.1 General description
The major portion of the interface requirements/implementation is de-
scribed in the SCSI-2 Interface Product Manual (part number 77738479).
11.2 SCSI interface messages supported
Table 1 lists the messages supported by the Barracuda SCSI-1 and SCSI-
2 modes. ASA I is Seagate’s first generation of advanced SCSI architecture
firmware. ASA II is Seagate’s second generation of advanced SCSI archi-
tecture firmware.
Table 1. SCSI interface messages supported
Supported by
Msg ASA I ASA I ASA II
Message name code SCSI-1 SCSI-2 SCSI-2
Abort 06h Y Y Y
Abort tag 0Dh Y Y Y
Bus device reset 0Ch Y Y Y
Clear queue 0Eh N Y Y
Command complete 00h Y Y Y
Continue I/O Process 12h N N Y
Disconnect 04h Y Y Y
Extended messages 01h*** Y Y Y
Identify 80h-FFh Y Y Y
Ignore wide residue (two bytes) 23h N N N
Initiate recovery 0Fh N N N
Initiator detected error 05h Y Y Y
Linked command complete 0Ah Y Y Y
Linked command complete with flag 0Bh Y Y Y
Message parity error 09h Y Y Y
Message reject 07h Y Y Y
Modify data pointer *** N N N
No operation 08h Y Y Y
Queue tag messages (two bytes)
Head of queue tag 21h N Y Y
Ordered queue tag 22h N Y Y
Simple queue tag 20h N Y Y
Release recovery 10h N N N
Restore pointers 03h Y Y Y
Save data pointer 02h Y Y Y
Synchronous data transfer request *** Y Y Y
Target transfer disable 13h N N Y
Terminate I/O process 11h N N Y
Wide data transfer request *** N Y Y
*** Extended messages (see the
SCSI-2 Interface Product Manual)