Cheetah 18 Product Manual, Rev. B
39
9.0
Interface requirements
This section partially describes the interface requirements as implemented on the drives.
9.1
General description
This section describes in essentially general terms the interface requirements supported by the . No attempt is
made to describe all of the minute details of conditions and constraints that must be considered 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 excep-
tions as noted herein or in the Seagate
SCSI Interface Product Manual
, part number 77738479.
9.2
SCSI interface messages supported
Table 5 lists the messages supported by the SCSI-2 and SCSI-3 modes of the family drives.
Notes.
[1]
Extended messages (see the
SCSI Interface Product Manual,
part number 77738479).
Table 5:
SCSI messages supported by family drives
Message name
Message code
Supported by
SCSI-2/3
Abort
06h
Y
Abort-tag
0Dh
Y
Bus device reset
0Ch
Y
Clear ACA
16h
N
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
Queue tag messages (two bytes)
ACA
24h
N
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
Y
Wide data transfer request
[1]
Y
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