Barracuda 18XL Product Manual, Rev. A
45
9.0
Interface requirements
9.1
General description
This section describes in essentially general terms the interface requirements supported by the Barracuda
18XL. No attempt is made to describe all of the minute details of conditions and constraints that must be con-
sidered by designers when designing a system in which this family of drives can properly operate. Seagate
declares that the drives operate in accordance with the appropriate ANSI Standards referenced in various
places herein, with exceptions as noted herein or in the Seagate SCSI Interface Product Manual , part num-
ber 75789509.
9.2
SCSI interface messages supported
Table 5 lists the messages supported by the SCSI-2 and SCSI-3 modes of the Barracuda 18XL family drives.
Notes.
[1]
Extended messages (see the SCSI Interface Product Manual, part number 75789509).
Table 5:
SCSI messages supported by Barracuda 18XL family drives
Message name
Message code
Supported by
Barracuda 18XL
Abort
06h
Y
Abort-tag
0Dh
Y
Bus device reset
0Ch
Y
Clear queue
0Eh
Y
Command complete
00h
Y
Continue I/O process
12h
Y
Disconnect
04h
Y
Extended messages
01h [1]
Y
Identify
80h-FFh
Y
Ignore wide residue (two bytes)
23h
Y
Initiate recovery
0Fh
N
Initiator detected error
05h
Y
Linked command complete
0Ah
Y
Linked command complete with flag
0Bh
Y
Message parity error
09h
Y
Message reject
07h
Y
Modify data pointer
[1]
N
No operation
08h
Y
Parallel protocol request
[1]
Y
Queue tag messages (two bytes)
Head of queue tag
21h
Y
Ordered queue tag
22h
Y
Simple queue tag
20h
Y
Release recovery
10h
N
Restore pointers
03h
Y
Save data pointer
02h
Y
Synchronous data transfer req.
[1]
Y
Target transfer disable
13h
Y
Terminate I/O process
11h
N
Wide data transfer request
[1]
Y
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