dpANS Project
American National T10/2095-D
Standard
Revision 4
March 9, 2010
Information technology -
USB Attached SCSI (UAS)
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T10/2095-D Revision 4 March 9, 2010
ii dpANS USB Attached SCSI (UAS)
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American National Standard
for Information Technology
USB Attached SCSI
Secretariat
Information Technology Industry Council
Approved mm.dd.yy
American National Standards Institute, Inc.
ABSTRACT
This 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 coordinates 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.
T10/2095-D Revision 4 March 9, 2010
iv dpANS USB Attached SCSI (UAS)
Published by
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Printed in the United States of America
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March 9, 2010 T10/2095-D Revision 4
dpANS USB Attached SCSI (UAS) v
Contents
Page
Contents.................................................................................................................................................................v
Tables .................................................................................................................................................................. vii
Figures ................................................................................................................................................................ viii
Foreword...............................................................................................................................................................ix
Introduction ......................................................................................................................................................... xiii
1 Scope ................................................................................................................................................................. 1
2 Normative references ......................................................................................................................................... 2
2.1 Normative references ............................................................................................................................... 2
2.2 Approved references ................................................................................................................................ 2
2.3 References under development ............................................................................................................... 2
2.4 Other references ....................................................................................................................................... 3
3 Definitions, symbols, abbreviations, and conventions ....................................................................................... 4
3.1 Definitions ................................................................................................................................................. 4
3.2 Symbols and abbreviations ...................................................................................................................... 5
3.3 Keywords .................................................................................................................................................. 5
3.4 Editorial conventions ................................................................................................................................ 6
3.5 Numeric and character conventions ......................................................................................................... 7
3.5.1 Numeric conventions ....................................................................................................................... 7
3.5.2 Byte encoded character strings conventions .................................................................................. 7
3.6 Sequence figure notation .......................................................................................................................... 8
3.7 Notation for procedures and functions ...................................................................................................... 8
4 Model ................................................................................................................................................................. 9
4.1 Overview ................................................................................................................................................... 9
4.2 Tag handling ........................................................................................................................................... 10
4.3 Data transfers ......................................................................................................................................... 10
4.4 UAS domain ........................................................................................................................................... 11
4.5 Addressing .............................................................................................................................................. 12
4.6 World wide name .................................................................................................................................... 12
4.7 Resets .................................................................................................................................................... 13
4.8 I_T Nexus loss ........................................................................................................................................ 13
4.9 Target power loss expected ................................................................................................................... 13
4.10 USB error handling ............................................................................................................................... 13
5 USB .................................................................................................................................................................. 14
5.1 Overview ................................................................................................................................................. 14
5.2 USB resource requirements ................................................................................................................... 14
5.2.1 Overview ....................................................................................................................................... 14
5.2.2 USB class specific requests .......................................................................................................... 14
5.2.3 USB descriptors ............................................................................................................................ 14
6 Transport .......................................................................................................................................................... 19
6.1 Overview ................................................................................................................................................. 19
6.2 IUs .......................................................................................................................................................... 19
6.2.1 Overview ....................................................................................................................................... 19
6.2.2 COMMAND IU ............................................................................................................................... 20
6.2.3 READ READY IU .......................................................................................................................... 21
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