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Universal Serial Bus

Specification

Compaq

Hewlett-Packard

Intel

Lucent

Microsoft

NEC

Philips

Revision 2.0

April 27, 2000

Universal Serial Bus Specification Revision 2.0

Scope of this Revision

The 2.0 revision of the specification is intended for product design. Every attempt has been made to ensure a

consistent and implementable specification. Implementations should ensure compliance with this revision.

Revision History

Revision Issue Date Comments

0.7 November 11, 1994 Supersedes 0.6e.

0.8 December 30, 1994 Revisions to Chapters 3-8, 10, and 11. Added

appendixes.

0.9 April 13, 1995 Revisions to all the chapters.

0.99 August 25, 1995 Revisions to all the chapters.

1.0 FDR November 13, 1995 Revisions to Chapters 1, 2, 5-11.

1.0 January 15, 1996 Edits to Chapters 5, 6, 7, 8, 9, 10, and 11 for

consistency.

1.1 September 23, 1998 Updates to all chapters to fix problems identified.

2.0 (draft 0.79) October 5, 1999 Revisions to chapters 5, 7, 8, 9, 11 to add high

speed.

2.0 (draft 0.9) December 21, 1999 Revisions to all chapters to add high speed.

2.0 April 27, 2000 Revisions for high-speed mode.

Universal Serial Bus Specification

Hewlett-Packard Company, Intel Corporation, Lucent Technologies Inc,

Microsoft Corporation, NEC Corporation, Koninklijke Philips Electronics N.V.

INTELLECTUAL PROPERTY DISCLAIMER

THIS SPECIFICATION IS PROVIDED TO YOU “AS IS” WITH NO WARRANTIES WHATSOEVER,

INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FOR

ANY PARTICULAR PURPOSE. THE AUTHORS OF THIS SPECIFICATION DISCLAIM ALL LIABILITY,

INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE

OR IMPLEMENTATION OF INFORMATION IN THIS SPECIFICATION. THE PROVISION OF THIS

SPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED,

BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS.

All product names are trademarks, registered trademarks, or servicemarks of their respective owners.

Please send comments via electronic mail to techsup@usb.org

For industry information, refer to the USB Implementers Forum web page at http://www.usb.org

Universal Serial Bus Specification Revision 2.0

iii

Acknowledgement of USB 2.0 Technical Contribution

The authors of this specification would like to recognize the following people who participated in the USB

2.0 Promoter Group technical working groups. We would also like to thank others in the USB 2.0

Promoter companies and throughout the industry who contributed to the development of this specification.

Hub Working Group

John Garney Intel Corporation (Chair/Editor)

Ken Stufflebeam Compaq Computer Corporation

David Wooten Compaq Computer Corporation

Matt Nieberger Hewlett-Packard Company

John Howard Intel Corporation

Venkat Iyer Intel Corporation

Steve McGowan Intel Corporation

Geert Knapen Royal Philips Electronics

Zong Liang Wu Royal Philips Electronics

Jim Clee Lucent Technologies Inc

Jim Guziak Lucent Technologies Inc

Dave Thompson Lucent Technologies Inc

John Fuller Microsoft Corporation

Nathan Sherman Microsoft Corporation

Mark Williams Microsoft Corporation

Nobuo Furuya NEC Corporation

Toshimi Sakurai NEC Corporation

Moto Sato NEC Corporation

Katsuya Suzuki NEC Corporation

Electrical Working Group

Jon Lueker Intel Corporation (Chair/Editor)

David Wooten Compaq Computer Corporation

Matt Nieberger Hewlett-Packard Company

Larry Taugher Hewlett-Packard Company

Venkat Iyer Intel Corporation

Steve McGowan Intel Corporation

Mike Pennell Intel Corporation

Todd West Intel Corporation

Gerrit den Besten Royal Philips Electronics

Marq Kole Royal Philips Electronics

Zong Liang Wu Royal Philips Electronics

Jim Clee Lucent Technologies Inc

Jim Guziak Lucent Technologies Inc

Par Parikh Lucent Technologies Inc

Dave Thompson Lucent Technologies Inc

Ed Giaimo Microsoft Corporation

Mark Williams Microsoft Corporation

Toshihiko Ohtani NEC Corporation

Kugao Ouchi NEC Corporation

Katsuya Suzuki NEC Corporation

Toshio Tasaki NEC Corporation

Universal Serial Bus Specification Revision 2.0

Contents

CHAPTER 1 INTRODUCTION

1.1 Motivation.............................................................................................................................................. 1

1.2 Objective of the Specification............................................................................................................... 1

1.3 Scope of the Document.......................................................................................................................... 2

1.4 USB Product Compliance ..................................................................................................................... 2

1.5 Document Organization........................................................................................................................ 2

CHAPTER 2 TERMS AND ABBREVIATIONS

CHAPTER 3 BACKGROUND

3.1 Goals for the Universal Serial Bus ..................................................................................................... 11

3.2 Taxonomy of Application Space......................................................................................................... 12

3.3 Feature List.......................................................................................................................................... 13

CHAPTER 4 ARCHITECTURAL OVERVIEW

4.1 USB System Description ..................................................................................................................... 15

4.1.1 Bus Topology................................................................................................................................. 16

4.2 Physical Interface ................................................................................................................................ 17

4.2.1 Electrical......................................................................................................................................... 17

4.2.2 Mechanical ..................................................................................................................................... 18

4.3 Power.................................................................................................................................................... 18

4.3.1 Power Distribution ......................................................................................................................... 18

4.3.2 Power Management........................................................................................................................ 18

4.4 Bus Protocol......................................................................................................................................... 18

4.5 Robustness............................................................................................................................................ 19

4.5.1 Error Detection............................................................................................................................... 19

4.5.2 Error Handling................................................................................................................................ 19

4.6 System Configuration.......................................................................................................................... 19

4.6.1 Attachment of USB Devices........................................................................................................... 20

4.6.2 Removal of USB Devices............................................................................................................... 20

4.6.3 Bus Enumeration............................................................................................................................ 20

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