SCSI Primary Commands - 2.pdf

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T10/1236-D Revision 20 18 July 2001Table C.7 shows the guidelines used by T10 when selecting a coded value for a revision.RevisionCodeTable C.7 — Revision code value guidelinesRevision0 No revision specified1 - 20 Revisions accepted as T10 committee drafts or stabilized drafts21 - 29 Revisions forwarded to NCITS or ANSI approved30 - 32 Revisions approved as international standards266 dpANS SCSI Primary Commands - 2 (SPC-2)
18 July 2001 T10/1236-D Revision 20C.7 Variable Length CDB Service Action CodesOnly one operation code is assigned to the variable length CDB (see 4.3.3). Therefore, the service action code iseffectively the operation code for variable length CDB uses. To allow command set standards to assign uses of thevariable length CDB without consulting SPC-2, ranges of service action codes are assigned to command sets asshown in table C.8.Table C.8 — Variable Length CDB Service Action Code RangesService ActionCode Range Doc. Description0000h - 07FFh SBC-2 Direct-access device (e.g., magnetic disk)0800h - 0FFFh SSC Sequential-access device (e.g., magnetic tape)1000h - 17FFh SSC Printer device1800h - 1FFFh SPC-2 Commands for all device types (see table C.9)2000h - 27FFh SBC-2 Write-once device (e.g., some optical disks)2800h - 2FFFh MMC-2 CD-ROM device3800h - 3FFFh SBC-2 Optical memory device (e.g., some optical disks)4000h - 47FFh SMC-2 Medium changer device (e.g., jukeboxes)5000h - 5FFFhDefined by ASC IT8 (Graphic arts pre-press devices)6000h - 67FFh SCC-2 Storage array controller device (e.g., RAID)7000h - 77FFh RBC Simplified direct-access device (e.g., magnetic disk)7800h - 7FFFh OCRW Optical card reader/writer device8800h - 8FFFh OSD Object-based Storage Device3000h - 37FFhReserved4800h - 4FFFhReserved6800h - 6FFFhReserved8000h - 87FFhReserved9000h - F7FFhReservedF800h - FFFFhVendor specificTable C.9 — Variable Length CDB Service Action Codes Used by All Device TypesService ActionCode1800h - 1FFFhDescriptionReserveddpANS SCSI Primary Commands - 2 (SPC-2) 267
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