1、American National StandardDeveloped byfor Information Technology USB Attached SCSI (UAS)INCITS 471-2010INCITS 471-2010Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright A
2、merican National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-INCITS 471-2010American National Standardfor Information Technology USB Attached SCSI (UAS)SecretariatInformation Technology Industry Counci
3、lApproved December 7, 2010 American National Standards Institute, Inc.AbstractThis standard specifies the requirements for the USB Attached SCSI (UAS) transport protocol. The UAS transport protocol defines a mechanism to transport SCSI commands using USB hardware. The UAS transport protocol coordina
4、tes with other members of the SCSI family of standards via the SAM-4 architecture model. This standard is intended to be used in conjunction with SCSI command set standards and USB specifications.Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo
5、 reproduction or networking permitted without license from IHS-,-,-Approval of an American National Standard requires review by ANSI that therequirements for due process, consensus, and other criteria for approval havebeen met by the standards developer.Consensus is established when, in the judgemen
6、t of th e ANSI Boar d ofStandards Review, substantial agreement has been reached by directly andmaterially affected interests. Substantial agreement means much more thana simple majority, but not necessarily unanimity. Consensus requires that allviews and objections be considered, and that a concert
7、ed effort be madetowards their resolution.The use of Amer ican Nation al Stan dards is comp letely vo luntary; theirexistence does not in any respect preclude anyone, whether he has approvedthe standards or not, from manufacturing, marketing, purchasing, or usingproducts, processes, or procedures no
8、t conforming to the standards.The American National Standards Institute does not develop standards andwill in no circ umstances give an inte rpretation of any A merican NationalStandard. Moreover, no person shall have the right or authority to issue aninterpretation of an American National Standard
9、in the name of the AmericanNational Sta ndards Institute. Re quests for interpretations should beaddressed to the secretariat or sponsor whose name appears on the titlepage of this standard.CAUTION NOTICE: This American National Standard may be revised orwithdrawn at any time. The procedures of the
10、American National StandardsInstitute require tha t action b e taken pe riodically to r eaffirm, r evise, orwithdraw this stan dard. Purchasers of American National Standards mayreceive current information on all standards by calling or writing the AmericanNational Standards Institute.American Nation
11、al StandardPublished byAmerican National Standards Institute, Inc.25 West 43rd Street, New York, NY 10036Copyright 2010 by Information Technology Industry Council (ITI)All rights reserved.No part of this publication may be reproduced in anyform, in an electronic retrieval system or otherwise,without
12、 prior written permission of ITI, 1101 K Street NW, Suite 610Washington, DC 20005. Printed in the United States of AmericaCAUTION: The developers of this standard have requested that holders of patents that may berequired for the implementation of the standard disclose such patents to the publisher.
13、 However,neither the developers nor the publisher have undertaken a patent search in order to identifywhich, if any, patents may apply to this standard. As of the date of publication of this standardand following calls for the identification of patents that may be required for the implementation oft
14、he standard, no such claims have been made. No further patent search is conducted by the de-veloper or publisher in respect to any standard it processes. No representation is made or impliedthat licenses are not required to avoid infringement in the use of this standard.Copyright American National S
15、tandards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-iContentsPageForewordvIntroduction.ix1 Scope 12 Normative references .22.1 Normative references .22.2 Approved references 22.3 References under development .2
16、2.4 Other references .33 Definitions, symbols, abbreviations, and conventions .43.1 Definitions .43.2 Symbols and abbreviations 53.3 Keywords 53.4 Editorial conventions 63.5 Numeric and character conventions .73.5.1 Numeric conventions .73.5.2 Byte encoded character strings conventions 73.6 Sequence
17、 figure notation 83.7 Notation for procedures and functions 84 Model .94.1 Overview .94.2 Tag handling .104.3 Data transfers .104.4 UAS domain .114.5 Addressing 124.6 World wide name 124.7 Resets 134.8 I_T Nexus loss 134.9 Target power loss expected .134.10 USB error handling .135 USB 145.1 Overview
18、 .145.2 USB resource requirements .145.2.1 Overview .145.2.2 USB class specific requests 145.2.3 USB descriptors 146 Transport 196.1 Overview .196.2 IUs 196.2.1 Overview .196.2.2 COMMAND IU .206.2.3 READ READY IU 216.2.4 WRITE READY IU .216.2.5 SENSE IU .226.2.6 RESPONSE IU 226.2.7 TASK MANAGEMENT I
19、U .236.3 Information unit sequences 266.3.1 Overview .26Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ii6.3.2 Non-data command/sense sequence .276.3.3 Non-data command/respons
20、e sequence 276.3.4 Data-out command sequence .286.3.5 Data-in command sequence .296.3.6 Task management function sequence 306.3.7 Bi-directional command sequence 316.3.8 Multiple command example 326.4 Transport requirements 347 SCSI Application Layer Transport Protocol Services .357.1 SCSI transport
21、 protocol services overview .357.2 Send SCSI Command transport protocol service .367.3 SCSI Command Received transport protocol service 377.4 Send Command Complete transport protocol service 377.5 Command Complete Received transport protocol service .397.6 Send Data-In transport protocol service .39
22、7.7 Data-In Delivered transport protocol service 407.8 Receive Data-Out transport protocol service 407.9 Data-Out Received transport protocol service 417.10 Terminate Data Transfer transport protocol service .417.11 Data Transfer Terminated transport protocol service .427.12 Send Task Management Req
23、uest transport protocol service .427.13 Task Management Request Received transport protocol service 437.14 Task Management Function Executed transport protocol service 447.15 Received Task Management Function Executed transport protocol service 457.16 USB Acknowledgement 468 Device server error hand
24、ling 47Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-iiiTablesPage1 Standards bodies 22 Numbering conventions 73 Device descriptor 144 Configuration descriptor 155 Interface D
25、escriptor. 166 Bulk-in endpoint descriptor. 167 Bulk-out endpoint descriptor. 178 Pipe Usage Descriptor 179 Pipe ID 1810 IU ID field summary 1911 IU Header 1912 COMMAND IU 2013 TASK ATTRIBUTE field 2014 READ READY IU 2115 WRITE READY IU 2116 SENSE IU. 2217 RESPONSE IU. 2218 RESPONSE CODE field. 2319
26、 TASK MANAGEMENT IU. 2420 task management function field 2521 Execute Command procedure call transport protocol services. 3522 Execute Command procedure call transport protocol services. 3623 Send SCSI Command transport protocol service arguments. 3624 SCSI Command Received transport protocol servic
27、e arguments. 3725 Send Command Complete transport protocol service arguments 3826 Command Complete Received transport protocol service arguments 3927 Send Data-In transport protocol service arguments. 4028 Data-In Delivered transport protocol service arguments. 4029 Receive Data-Out transport protoc
28、ol service arguments 4130 Data-Out Received transport protocol service arguments 4131 Terminate Data Transfer transport protocol service arguments 4232 Data Transfer Terminated transport protocol service arguments 4233 Send Task Management Request transport protocol service arguments. 4234 Task Mana
29、gement Request Received transport protocol service arguments. 4335 Task Management Function Executed transport protocol service arguments 4436 Received Task Management Function Executed transport protocol service arguments 4537 USB Acknowledgement 4638 Delivery Result to additional sense code mappin
30、g. 47Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-ivFiguresPage1 SCSI document relationships 12 Example Sequence figure. 83 USB Model 94 Example Simple UAS domain. 115 Exampl
31、e Complex UAS Domain. 126 UAS sequence figure notation 267 Non-data transfer with Sense. 278 Non-data Transfer with Response 279 Write Data Transfer. 2810 Read Data Transfer 2911 Task Management 3012 Bi-directional Data Transfer 3113 Multiple Command Example. 33Copyright American National Standards
32、Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-vForeword (This foreword is not part of American National Standard INCITS 471-2010.)The purpose of this standard is to define requirements for the transmission of SCSI
33、commands, in a manner compliant with SAM-4, across a USB physical interface.Requests for interpretation, suggestions for improvement and addenda, or defect reports are welcome. They should be sent to the INCITS Secretariat, National Committee for Information Technology Standards, Information Technol
34、ogy Institute, 1101 K Street, NW, Suite 610, Washington, DC 20005. This standard was processed and approved for submittal to ANSI by the InterNational Committee for Information Technology Standards (INCITS). Committee approval of the standard does not necessarily imply that all committee members vot
35、ed for approval. At the time of it approved this standard, INCITS had the following members:Don Wright, ChairJennifer Garner, SecretaryOrganization Represented Name of RepresentativeAdobe Systems Inc.Scott Foshee Steve Zilles (Alt.)AIM Global Inc. Dan Mullen Charles Biss (Alt.)Apple Computer, Inc. .
36、Kwok Lau Helene Workman (Alt.)David Singer (Alt.)Distributed Management Task Force John Crandall Jeff Hilland (Alt.)Electronic Industries Alliance .Edward Mikoski, Jr. Henry Cuschieri (Alt.)EMC Corporation .Gary Robinson Farance Inc.Frank Farance Timothy Schoechle (Alt.)GoogleZaheda Bhorat GS1 US .R
37、ay Delnicki Frank Sharkey (Alt.)James Chronowski (Alt.)Mary Wilson (Alt.)Hewlett-Packard Company Karen Higginbottom Paul Jeran (Alt.)IBM Corporation Gerald Lane Robert Weir (Alt.)Arnaud Le Hors (Alt.)Debra Boland (Alt.)Steve Holbrook (Alt.)IEEE.Bill Ash Jodie Haasz (Alt.)Bob Labelle (Alt.)Intel Phil
38、ip Wennblom Grace Wei (Alt.)Stephen Balogh (Alt.)Lexmark International.Don Wright Dwight Lewis (Alt.)Paul Menard (Alt.)Jerry Thrasher (Alt.)Microsoft Corporation.Jim Hughes Dick Brackney (Alt.)John Calhoun (Alt.)Copyright American National Standards Institute Provided by IHS under license with ANSI
39、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-viOrganization Represented Name of RepresentativeNational Institute of Standards b) complies with SCSI Architecture Model - 4 (e.g., autosense and command queuing); andc) other capabilities.Device-type specific comman
40、d sets (e.g., SBC-3 (ISO/IEC 14776-323),SSC-3 (ISO/IEC 14776-333),MMC-5 (ISO/IEC 14776-365)Primary command set(shared for all device types)(SPC-4 (ISO/IEC 14776-454)SCSI transport protocols (e.g., SAS-2 (ISO/IEC 14776-152),FCP-4 (ISO/IEC 14776-224),this standard)Interconnects (e.g.,USB-2, USB-3,SPI-
41、5 (ISO/IEC 14776-115),Fibre Channel (ISO/IEC 14165)SCSIArchitectureModel(SAM-4 (ISO/IEC 14776-414)Copyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,-INCITS 471-201022 Normative ref
42、erences2.1 Normative referencesReferenced standards and specifications contain provisions that, by reference in the text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on t
43、his standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below.Copies of the following documents may be obtained from ANSI:a) approved ANSI standards;b) approved and draft international and regional standards (e.g., ISO, IEC); andc) appr
44、oved and draft foreign standards (e.g., JIS and DIN).For further information, contact ANSI Customer Service Department at 212-642-4900 (phone), 212-302-1286 (fax) or via the World Wide Web at http:/www.ansi.org.Additional availability contact information is provided below as needed.Table1 shows stan
45、dards bodies and their web sites.2.2 Approved referencesAt the time of publication, the following referenced standards or technical reports were approved:ISO/IEC 14776-414, SCSI Architecture Model-4 (SAM-4) (ANSI INCITS 447-2008)2.3 References under developmentAt the time of publication, the followi
46、ng referenced standards were still under development. For information on the current status of the document, or regarding availability, contact the relevant standards body or other organization as indicated.ISO/IEC 14776-454, SCSI Primary Commands-4 (SPC-4) (T10/1731-D)NOTE 1 For more information on
47、 the current status of these documents, contact the INCITS Secretariat at 202-737-8888 (phone), 202-638-4922 (fax) or via E-mail at incitsitic.org. To obtain copies of these documents, contact ANSIs Customer Service Department at 212-642-4900, or order from the ANSI Electronic Standards Store at htt
48、p:/www.ansi.org.Table 1 Standards bodiesAbbreviation Standards body Web siteANSI American National Standards Institute http:/www.ansi.orgIEC International Electrotechnical Commission http:/www.iec.chINCITSInternational Committee for Information Technology Standardshttp:/www.incits.orgISO International Standards Organization http:/www.iso.chT10 INCITS T10 SCSI storage interfaces http:/www.t10.orgCopyright American National Standards Institute Provided by IHS under license with ANSI Not for ResaleNo reproduction or networking permitted without license from IHS-,-,
