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ST15150N/ND/W/WD/WC/DC Product Manual, Rev. D
11.0
11.1
11.2
Interface requirements
This section describes the interface requirements as implemented on
Barracuda 4 drives.
ASA I is Seagate's first generation of Advanced SCSI Architecture firmware.
ASA II is Seagate's second generation of Advanced SCSI Architecture
firmware.
General description
The major portion of the interface requirements/implementation is described
in the SCSI-2 Interface Product Manual (part number 77738479).
SCSI interface messages supported
Table 4 lists the messages supported by the Barracuda 4 drives SCSI-1
and SCSI-2 modes.
Table 4. SCSI messages supported
Message name
Abort
Abort tag
Bus device reset
Clear queue
Command complete
Continue I/O Process
Disconnect
Extended messages
Identify
Ignore wide residue (two bytes)
Initiate recovery
Initiator detected error
Linked command complete
Linked command complete with flag
Message parity error
Message reject
Modify data pointer
No operation
Queue tag messages (two bytes)
Head of queue tag
Ordered queue tag
Simple queue tag
Release recovery
Restore pointers
Save data pointer
Synchronous data transfer request
Target transfer disable
Terminate I/O process
Wide data transfer request
*** Extended messages (see the SCSI-2 Interface Product Manual)
Supported by:
Msg
ASA I
ASA I
code
SCSI-1
SCSI-2
06h
Y
0Dh
Y
0Ch
Y
0Eh
N
00h
Y
12h
N
04h
Y
01h***
Y
80h-FFh
Y
23h
N
0Fh
N
05h
Y
0Ah
Y
0Bh
Y
09h
Y
07h
Y
***
N
08h
Y
21h
N
22h
N
20h
N
10h
N
03h
Y
02h
Y
***
Y
13h
N
11h
N
***
N
59
ASA II
SCSI-2
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
Y
Y
Y
Y
Y
Y
Y
N
Y
N
N
Y
Y
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Y
Y
Y
Y
Y
Y
Y
Y
N
N
Y
Y
Y
Y
Y
Y
N
Y
N
Y
Y
Y
- Quick Links:
- Figure 1. Barracuda 4 Disc Drive
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