IEC 62680-4-1:2022
(Main)Universal Serial Bus interfaces for data and power - Part 4-1: Universal Serial Bus 4 ™ Specification
Universal Serial Bus interfaces for data and power - Part 4-1: Universal Serial Bus 4 ™ Specification
IEC 62680-4-1:2022 provides Universal Serial Bus 4™ Specification.
USB 3.1 and USB 3.2 were evolutionary steps to increase bandwidth. The goal for USB4 remains the same with the added goal of helping to converge the USB Type-C® connector ecosystem and minimize end-user confusion. Several key design areas to meet this goal are listed below:
• Offer display, data, and load/store functionality over a single USB Type-C connector.
• Retain compatibility with existing ecosystem of USB and Thunderbolt™ products.
• Define Port Capabilities for predictable and consistent user experience.
• Provide increased host flexibility to configure bandwidth, power management, and other performance-related parameters for system needs
This document contains USB4™ Specification, Version 1.0 with Errata and ECN through May 19, 2021.
Interfaces de bus universel en série pour les données et l'alimentation électrique - Partie 4-1: Spécification du bus universel en série 4™
L'IEC 62680-4-1:2022 contient des spécification du bus universel en série 4™
L'USB 3.1 et l'USB 3.2 ont constitué des étapes évolutives visant à augmenter la bande passante. L'objectif de l'USB4 reste le même, avec l'objectif supplémentaire d'aider à converger l'écosystème de connecteurs USB Type-C® et de réduire autant que possible la confusion pour l'utilisateur final. Plusieurs aspects de conception essentiels pour atteindre cet objectif sont répertoriés ci-dessous:
• offrir une fonctionnalité d'affichage, de données et de charge/stockage sur un seul connecteur USB Type-C;
• maintenir la compatibilité avec l'écosystème existant de produits USB et Thunderbolt™;
• définir les capacités de port pour produire une expérience utilisateur prévisible et cohérente;
• fournir davantage de flexibilité à l'hôte pour configurer la bande passante, la gestion de l'alimentation et d'autres paramètres liés aux performances pour les besoins du système.
Inclut les errata et ECN au 19 mai 2021 dans le texte de la spécification.
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IEC 62680-4-1
®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
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Universal Serial Bus interfaces for data and power –
Part 4-1: Universal Serial Bus 4 ™ Specification
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- 2 - IEC 62680-4-1:2022
© USB-IF 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER
Part 4-1: Universal Serial Bus 4™ Specification
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
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International Standard IEC 62680-4-1 has been prepared by technical area 18: Multimedia
home systems and applications for end-user networks, of IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard was prepared by the USB Implementers Forum (USB-IF). The
structure and editorial rules used in this publication reflect the practice of the organization
which submitted it.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3754/CDV 100/3813/RVC
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IEC 62680-4-1:2022 - 3 -
© USB-IF 2021
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
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• replaced by a revised edition, or
• amended.
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© USB-IF 2021
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by the USB
Implementers Forum (USB-IF). These specifications were submitted to the IEC under the auspices of
a special agreement between the IEC and the USB-IF.
This standard is the USB-IF publication, USB4™ Specification, Version 1.0 with Errata and ECN
through May 19, 2021.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group of
companies that developed the Universal Serial Bus specification. The USB-IF was formed to provide
a support organization and forum for the advancement and adoption of Universal Serial Bus
technology. The Forum facilitates the development of high-quality compatible USB peripherals
(devices), and promotes the benefits of USB and the quality of products that have passed compliance
testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS, "WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT,
OR FITNESS FOR ANY PARTICULAR PURPOSE. THE USB IMPLEMENTERS FORUM AND THE
AUTHORS OF ANY USB SPECIFICATIONS DISCLAIM ALL LIABILITY, INCLUDING LIABILITY
FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR
IMPLEMENTATION OR INFORMATION IN THIS SPECIFICAITON.
THE PROVISION OF ANY USB SPECIFICATIONS TO YOU DOES NOT PROVIDE YOU WITH ANY
LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL
PROPERTY RIGHTS.
Entering into USB Adopters Agreements may, however, allow a signing company to participate in a
reciprocal, RAND-Z licensing arrangement for compliant products. For more information, please see:
https://www.usb.org/documents
IEC DOES NOT TAKE ANY POSITION AS TO WHETHER IT IS ADVISABLE FOR YOU TO ENTER
INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB IMPLEMENTERS
FORUM.”
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IEC 62680-4-1:2022 - 5 -
© USB-IF 2021
Universal Serial Bus 4 (USB4™)
Specification
Apple Inc.
HP Inc.
Intel Corporation
Microsoft Corporation
Renesas Corporation
STMicroelectronics
Texas Instruments
Version 1.0 with Errata and ECN through May 19, 2021
May 2021
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© USB-IF 2021
Release History
Version Comments Issue Date
1.0 First release August 2019
1.0 with Errata and ECN through Includes errata and ECN through May 4, June 2020
May 4, 2020 2020 as part of the specification text.
1.0 with Errata and ECN through Includes errata and ECN through October October 2020
October 15, 2020 15, 2020 as part of the specification text.
1.0 with Errata and ECN through Includes errata and ECN through May 19, May 2021
May 19, 2021 2021 as part of the specification text.
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IEC 62680-4-1:2022 - 7 -
© USB-IF 2021
NOTE: Adopters may only use this USB specification to implement USB or third party functionality as
expressly described in this Specification; all other uses are prohibited.
LIMITED COPYRIGHT LICENSE: The Promoters grant a conditional copyright license under the
copyrights embodied in this USB Specification to use and reproduce the Specification for the sole
purpose of, and solely to the extent necessary for, evaluating whether to implement the
Specification in products that would comply with the specification. Without limiting the foregoing,
use of the Specification for the purpose of filing or modifying any patent application to target the
Specification or USB compliant products is not authorized. Except for this express copyright license,
no other rights or licenses are granted, including without limitation any patent licenses. In order to
obtain any additional intellectual property licenses or licensing commitments associated with the
Specification a party must execute the USB Adopters Agreement. NOTE: By using the Specification,
you accept these license terms on your own behalf and, in the case where you are doing this as an
employee, on behalf of your employer.
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 FOR INFRINGEMENT OF
ANY PROPRIETARY RIGHTS, RELATING TO THE 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.
Please send comments to techsup@usb.org.
For industry information, refer to the USB Implementers Forum web page at
http://www.usb.org.
USB Type-C®, USB-C®, USB 2.0 Type-C™, and USB4™ are trademarks of the Universal
Serial Bus Implementers Forum (USB-IF). DisplayPort™ is a trademark of VESA. All product
names are trademarks, registered trademarks, or service marks of their respective owners.
Thunderbolt™ is a trademark of Intel Corporation. You may only use the Thunderbolt™
trademark or logo in conjunction with products designed to this specification that complete
proper certification and executing a Thunderbolt™ trademark license – see usb.org/compliance
for further information
Copyright © 2021, USB Promoter Group (Apple Inc., HP Inc., Intel Corporation, Microsoft
Corporation, Renesas Corporation, STMicroelectronics, and Texas Instruments).
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© USB-IF 2021
Acknowledgement of Technical Contribution
The authors of this specification would like to recognize the following people who participated
in the USB4 Specification technical work group.
Apple Inc. – Promoter Company Employees
Majd Abu Tayeh Nimrod Agmon Lior Aloni Brian Baek
Omer Bar-Lev Moshe Benyamini Gopu Bhaskar Carlos Calderon
David Conroy Bill Cornelius Scott Deandrea William Ferry
Amit Flanter Itay Franko Radia Gantous Alex Gerber
Mark Goikhman Nir Guetta Yair Hershkovitz Scott Jackson
Husam Khashiboun Alan Kobayashi Alexei Kosut Christine Krause
Dmitri Krichevsky Alex Lozovik Rachel Menes Shlomi Mor
Shlomi Museri Mona Omari Tal Ostro Arie Peled
Collin Pieper Idan Reller Reese Schreiber Oleg Schtofenmaher
Etan Shirron Ori Moshe Stern Jose Tierno Maxim Tsudik
Anatoly Uskach Jeff Wilcox Dan Wilson Ohad Zalcman
HP Inc. – Promoter Company Employees
Roger Benson Marcus Benzel Alan Berkema Kenneth Chan
Frank Chen Phil Chen Hosup Chung Glen Dower
Mark Lessman Nam Nguyen Roger Pearson Kenneth Smith
Chris Tabarez
Intel Corporation – Promoter Company Employees
Nausheen Ansari Noam Arzy Alexandre Audier Binata Bhattacharyya
Huimin Chen Hengju Cheng Salauddin Choudhury John Crouter
Maxim Dan Jhuda Dayan Yoni Dishon Eran Galil
Saranya Gopal Venkataramani Raul Gutierrez Michael Gouzenfeld
Gopalakrishnan
Mickey Gutman Benjamin Hacker Yaniv Hayat Uri Hermoni
Alon Horn Abdul Ismail Abhilash K V Ziv Kabiry
Vijaykumar Kadgi Vijay Kasturi Sergey Khaykin Lev Kolomiets
Vladislav Kopzon Efraim Kugman Edmond Lau Uriel Lemberger
Yun Ling Guobin Liu Balaji Manoharan Liran Manor
Uma Medepalli Assaf Mevorach Hezi Naaman Ohad Navon
Naod Negussie CheeLim Nge Leonid Plaks Duane Quiet
Rajaram Regupathy Reuven Rozic Oren Salomon Zeeshan Sarwar
Brad Saunders Leonid Shaposhnik Ehud Shoor Ari Sharon
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IEC 62680-4-1:2022 - 9 -
© USB-IF 2021
Uri Soloveychik Einat Surijan Aviel Uzan Karthi Vadivelu
Alex Vekker Chen Vrubel Stephanie Wallick Tzewen Wang
Sarel Wechsler Ady Weiss Vitaly Zhivov Gal Yedidia
Vladimir Yudovich Aruni Nelson
Microsoft Corporation – Promoter Company Employees
Randy Aull Jim Belesiu Martin Borve Anthony Chen
Jesse Chen Matt Chung Aacer Daken Rajib Dutta
Mark Friend Philip Froese David Hargrove Robbie Harris
Kit Hui Toby Nixon Rahul Ramadas Andrea Severson
Kiran Shastry Nathan Sherman Ji Sun Shyamal Varma
Renesas Corporation – Promoter Company Employees
Tam Do Robert Dunstan Philip Leung Kiichi Muto
Ziba Nami Hajime Nozaki Raman Sargis Yoshiyuki Tomoda
Starry Tsai Jia Wei Toshifumi Yamaoka
STMicroelectronics – Promoter Company Employees
Nathalie Ballot Joel Huloux Gerard Mas
Texas Instruments – Promoter Company Employees
Mike Campbell Anant Gole Craig Greenburg Michael Koltun IV
Sai Karthik Rajaraman Anwar Sadat Cory Stewart Sue Vining
Deric Waters Gregory Watkins
Contributor Company Employees
ACON, Advanced- Victory Chen Conrad Choy Vicky Chuang
Connectek, Inc.
Jessica Feng Sharon Hsiao Wayne Wang
Advanced Micro Dennis Au Nat Barbiero Jason Chang
Devices
Michael Comai Walter Fry Will Harris
Jason Hawken Jim Hunkins Ling Kong
Scott Ogle Victor Salim Joseph Scanlon
Peter Teng
Allion Labs, Inc. Howard Chang Casper Lee Brian Shih
Analogix Greg Stewart Haijian Sui Yueke Tang
Semiconductor, Inc.
Ning Zhu
Anritsu Corporation Wataru Aoba John Jerico Custodio Kazuhiro Fujinuma
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© USB-IF 2021
Hiroshi Goto Alessandro Messina Tadanori Nishikobara
Ryo Sunayama Toshihiro Suzuki Mitsuhiro Usuba
Takeshi Wada
ASMedia Technology Chang Chinyu Chang Weiyun Chen Chiahsin
Inc.
Chen Chunhung Chuang Weber Kuo Han Sung
Lin Curtis Lin ShuYu Tseng PS
Tseng YD Wei Daniel Wu ShengChung
Avery Design Systems,
Chris Browy Chilai Huang Zhihong Zeng
Inc.
BitifEye Digital Test
Sebastian Muschala Hermann Stehling
Solutions GmbH
Bizlink Technology, Morphy Hsieh Kevin Tsai
Inc. Alex Chou
Cadence Design Marcin Behrendt Jacek Duda Shikha Gupta
Systems, Inc.
Gaurav Jain Poonam Khatri Yash Kothari
Vinod Lakshman Shivaji Magadum Andy Mauffet-Smith
Rohit Mishra Uyen Nguyen Raja Pounraj
Thirumal Reddy Anand RK Anshul Shah
Neelabh Singh Ofer Steinberg Mark Summers
Claire Ying Wasiq Zia
Corigine, Inc. Kevin Fan Ali Khan Xiao Xiao
Corning Optical Mark Bradley Wojciech Giziewicz Ian McKay
Communications LLC
Jamie Silva
Cypress Mark Fu Naman Jain Savan Javia
Semiconductor
Palani Subbiah
Dell Inc. Mohammed Hijazi Tom Lanzoni Ken Nicholas
Marcin Nowak Scott Ogle Adie Tan
Lee Zaretsky
Diodes Incorporated Qun Song
DisplayLink (UK) Ltd. Pete Burgers Dan Ellis
DJI Technology Co.,
Ltd. Steve Huang
Electronics Testing
Sophia Liu
Center, Taiwan
Elka International Ltd. Alvin Cheng Chloe Hsieh Roy Ting
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IEC 62680-4-1:2022 - 11 -
© USB-IF 2021
Jui-Ming Yang
Ellisys Abel Astley Mario Pasquali Chuck Trefts
Tim Wei
Etron Technology, Inc. Andy Chen Shihmin Hsu Bryan Huang
Chien-Cheng Kuo Jen Hong Larn
Foxconn / Hon Hai Patrick Casher Joe Chen Jason Chou
Fred Fons Bob Hall Terry Little
Christine Tran A.J. Yang Jie Zheng
Fresco Logic Inc. Tim Barilovits Bob McVay Christopher Meyers
Jie Ni Jeffrey Yang
Genesys Logic, Inc. Sean Chen Gerry Chou Thomas Hsieh
Jerry Hu Perlman Hu Roy Huang
ChunYen Kuo Weddell Lee Jimmy Lin
Miller Lin D.C. Lu Greg Tu
Han Wu Yihsun Wu
Google Inc. Mark Hayter Benson Leung Raj Mojumder
David Schneider
Granite River Labs Nikhil Acharya Yun Han Ang Sandy Chang
Allen Chen Cyan Chen Swee Guan Chua
Alan Chuang Steven Lee Caspar Lin
Tim Lin Krishna Murthy Johnson Tan
Rajaraman V Chin Hun Yaep
Hotron Precision
Rosa Chen Patrick Yeh YF Zhang
Electronic Ind. Corp.
I-PEX (Dai-ichi Seiko) Alan Kinningham Ro Richard
Japan Aviation
Electronics Industry
Mark Saubert Junichi Takeuchi
Ltd.
JMicron Technology
Charon Chen Mika Cheng Kevin Liu
Corp.
Kandou Bus SA Brian Holden Hitaish Sharma David Stauffer
Andrew Stewart Mark Vennebarger
Keysight Technologies Atsushi Imaoka Biing Lin Lem Jit Lim
Inc.
Francis Liu Roland Scherzinger
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© USB-IF 2021
L&T Technology Binu Chinna Thankam Sunil Kumar Siddharth Pethe
Services
Badrinath Ramachandra Arunkumar Selvam Gayathri SN
LeCroy Corporation Alan Blankman Patrick Connally Carl Damn
David Fraticelli Daniel H Jacobs Farnoosh Jafary
Tyler Joe Carlo Mazzetti Mike Micheletti
Kathryn Morales Jeff Sabuda Joseph Schachner
Chris Webb
Lenovo Toshikazu Horino Shinji Matsushima Yuuki Matsuura
Nozomu Nagata Munefumi Nakata Kazuya Shibayama
Shunki Sugai Chikara Takahashi Masahiro Tokuno
Kayanagi Tsuneo
LG Electronics Inc. Do Kyun Kim Yoon Jong Lee Seung Yoo
Lintes Technology Co., Tammy Huang Charles Kaun RD Lintes
Ltd.
Max Lo CT Pien Jin Yi Tu
Jason Yang
Lotes Co., Ltd. Regina Liu-Hwang John Lynch
Luxshare-ICT Josue Casillo CY Hsu Antony Lin
John Lin Stone Lin Scott Shuey
Eric Wen Pat Young
Maxio Technology
George Fang
(Hangzhou) Ltd.
MediaTek Inc. Henry Chen Alexyc Lin Pochou Lin
Chiachun Wang
MegaChips
Rahul Agarwal Ramesh Dandapani Satoru Kumashiro
Corporation
Ryuichi Mariizumi Sireesha Vemulapalli Nobu Yanagisawa
Mercedes-Benz
Research &
Hans Wickler
Development, North
America, Inc.
Microchip Technology Mark Bohm Atish Ghosh Fernando Gonzalez
Inc.
Mark Gordon Richard Petrie Brigham Steele
Anthony Tarascio Robert Zakowicz
Molex LLC Alan MacDougall
MQP Electronics Ltd. Sten Carlsen Pat Crowe
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IEC 62680-4-1:2022 - 13 -
© USB-IF 2021
Newnex Technology
Sam Liu
Corp.
NVIDIA Jamie Aitken Mark Overby
NXP Semiconductors Mahmoud El Sabbagh Ken Jaramillo Abhijeet Kulkarni
Vijendra Kuroodi Krishnan TN
Oculus VR LLC Marty Evans Joaquin Fierro Chao Hu
ON Semiconductor Eduardo De Reza Oscar Freitas Christian Klein
Amir Lahooti
Parade Technologies,
Jian Chen Jimmy Chiu Mark Qu
Inc.
Craig Wiley Paul Xu Kevin Yuan
Alan Yuen
Phison Electronics Jimmy Chen Ko Hong Lipp Sebastien Jean
Corp.
Stark Kuan Thomas Lee Anton Lin
Winnie Lu Wei Sui-Ning James Tsai
Michael Wu Fu-Hua Yang Chang Yuan-Cheng
Qualcomm, Inc Tomer Ben Chen Yiftach Benjamini Richard Burrows
Amit Gil James Goel Philip Hardy
Raja Jagadeesan Lalan Mishra Dmitrii Vasilchenko
Chris Wiesner
Realtek Semiconductor Chung-Chun Chen Jen Wen Chen Shen Chen
Corp.
Jonathan Chou Chang Ding Yao Feng
Bokai Huang An-Ming Lee Ray Lee
Ryan Lin Terry Lin Luobin Wang
Kay Yin Chris Zeng
Rohde & Schwarz
Johannes Ganzert Randy White
GmbH & Co. KG
Samsung Electronics Jaedeok Cha KangSeok Cho CheolYoon Chung
Co., Ltd.
Sangju Kim Termi Kwon Cheolho Lee
Edward Lee Jun Bum Lee Chahoon Park
Sunggeun Yoon
Seagate Technology Alvin Cox Paul McParland Michael Morgan
LLC
Cuong Tran
Silicon Line GmbH Ian Jackson
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- 14 - IEC 62680-4-1:2022
© USB-IF 2021
Rakesh Polasa Satish Anand Verkila
SiliConch Systems
Private Limited
Kaustubh Kumar
Softnautics LLP Hetal Jariwala Dipakkumar Modi
Bhavesh Desai
Ujjwal Talati
Ishita Shah
James McGrath
Spectra7 Microsystems
Corp.
Alex Chow
Specwerkz Sydney Fernandes Amanda Hosler Diane Lenox
Soren Petersen
STMicroelectronics Nathalie Ballot Joel Huloux Gerard Mas
Sumitomo Electric Ind.,
Ltd., Optical Comm.
Sainer Siagian Mitsuaki Tamura
R&D Lab
Synaptics Inc. Jeff Lukanc Mark Miller Prashant Shamarao
Synopsys, Inc. Prishkrit Abrol Subramaniam Jeanne Cai
Aravindhan
Jun Cao Morten Christiansen Scott Guo
Eric Huang Joseph Juan Venkataraghavan
Krishnan
Jitendra Kushwaha Behram Minwalla Saleem Mohammad
Rick Schmidt Jasjeet Singh Mahendra Singh
John Stonick Zongyao Wen Fred Yu
Madhusudan Acharya Sourabh Das Keyur Diwan
Tektronix, Inc.
Mark Guenther Abhijeet Shinde Gary Simontom
Shuhei Yamamoto
Thine Electronics, Inc.
Simon Li Jeff Mason Jacky Mo
Tyco Electronics
Corp., a TE
Tommy Yu Yuanbo Zhang Tony Zhu
Connectivity Ltd.
company
Kai Inha
Varjo Technologies
Wayne Tseng
VIA Labs, Inc.
Benjamin Pan Terrance Shih Jay Tseng
VIA Technologies, Inc.
Fong-Jim Wang
Chao-Chee Ku Jeng Cheng Liu Wayne Lo
Weltrend
Semiconductor
Ho Wen Tsai Eric Wu Randolph Wu
Simon Yeh
David Landsman Larry McMillan Rob Ryan
Western Digital
Steve Bright Zach Moore Joe O’Brien
Wilder Technologies
Majid Shayegh
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IEC 62680-4-1:2022 - 15 -
© USB-IF 2021
CONTENTS
1 Introduction . 41
1.1 Scope of the Document . 41
1.2 USB Product Compliance . 41
1.3 Document Organization . 41
1.4 Design Goals . 41
1.5 Related Documents . 41
1.6 Conventions . 42
1.6.1 Precedence . 42
1.6.2 Keywords . 42
1.6.2.1 Informative . 42
1.6.2.2 May . 42
1.6.2.3 N/A . 42
1.6.2.4 Normative . 42
1.6.2.5 Optional . 42
1.6.2.6 Reserved . 42
1.6.2.7 Shall . 42
1.6.2.8 Should . 43
1.6.3 Capitalization . 43
1.6.4 Italic Text . 43
1.6.5 Numbering . 43
1.6.6 Bit, Byte, DW, and Symbol Conventions . 43
1.6.7 Implementation Notes. 43
1.6.8 Connection Manager Notes . 43
1.6.9 Pseudocode . 43
1.6.10 CRC Algorithms . 44
1.6.11 FourCC . 44
1.7 Reserved Values and Fields . 44
1.8 Terms and Abbreviations . 45
2 Architectural Overview . 50
2.1 USB4 System Description . 50
2.1.1 Architectural Constructs . 52
2.1.1.1 Routers. 52
2.1.1.2 Adapters . 52
2.1.1.3 USB4 Ports and Links . 52
2.1.1.4 USB4 Devices . 53
2.1.1.5 USB4 Host . 54
2.1.1.6 Re-timers . 55
2.1.1.7 Connection Manager . 55
2.1.2 USB4 Mechanical . 55
2.1.3 USB4 Power . 55
2.1.4 USB4 System Configuration . 55
2.1.5 Thunderbolt™ 3 (TBT3) Compatibility Support. 55
2.1.6 USB Type-C Alternate Mode Compatibility Support . 56
2.2 USB4 Fabric Architecture . 56
2.2.1 USB4 Functional Stack . 56
---------------------- Page: 17 ----------------------
- 16 - IEC 62680-4-1:2022
© USB-IF 2021
2.2.1.1 Electrical Layer . 57
2.2.1.2 Logical Layer . 57
2.2.1.3 Transport Layer . 57
2.2.1.4 Configuration Layer .
...
IEC 62680-4-1
®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Universal Serial Bus interfaces for data and power –
Part 4-1: Universal Serial Bus 4™ Specification
Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 4-1: Spécification du bus universel en série 4™
IEC 62680-4-1:2022-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 62680-4-1
®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Universal Serial Bus interfaces for data and power –
Part 4-1: Universal Serial Bus 4™ Specification
Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 4-1: Spécification du bus universel en série 4™
INTERNATIONAL
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---------------------- Page: 3 ----------------------
- 2 - IEC 62680-4-1:2022
© USB-IF 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER
Part 4-1: Universal Serial Bus 4™ Specification
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical
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preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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Organization for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62680-4-1 has been prepared by technical area 18: Multimedia
home systems and applications for end-user networks, of IEC technical committee 100: Audio,
video and multimedia systems and equipment.
The text of this standard was prepared by the USB Implementers Forum (USB-IF). The
structure and editorial rules used in this publication reflect the practice of the organization
which submitted it.
---------------------- Page: 4 ----------------------
IEC 62680-4-1:2022 - 3 -
© USB-IF 2021
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3754/CDV 100/3813/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
---------------------- Page: 5 ----------------------
- 4 - IEC 62680-4-1:2022
© USB-IF 2021
INTRODUCTION
The IEC 62680 series is based on a series of specifications that were originally developed by the USB
Implementers Forum (USB-IF). These specifications were submitted to the IEC under the auspices of
a special agreement between the IEC and the USB-IF.
This standard is the USB-IF publication, USB4™ Specification, Version 1.0 with Errata and ECN
through May 19, 2021.
The USB Implementers Forum, Inc.(USB-IF) is a non-profit corporation founded by the group of
companies that developed the Universal Serial Bus specification. The USB-IF was formed to provide
a support organization and forum for the advancement and adoption of Universal Serial Bus
technology. The Forum facilitates the development of high-quality compatible USB peripherals
(devices), and promotes the benefits of USB and the quality of products that have passed compliance
testing.
ANY USB SPECIFICATIONS ARE PROVIDED TO YOU "AS IS, "WITH NO WARRANTIES
WHATSOEVER, INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT,
OR FITNESS FOR ANY PARTICULAR PURPOSE. THE USB IMPLEMENTERS FORUM AND THE
AUTHORS OF ANY USB SPECIFICATIONS DISCLAIM ALL LIABILITY, INCLUDING LIABILITY
FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USE OR
IMPLEMENTATION OR INFORMATION IN THIS SPECIFICAITON.
THE PROVISION OF ANY USB SPECIFICATIONS TO YOU DOES NOT PROVIDE YOU WITH ANY
LICENSE, EXPRESS OR IMPLIED, BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL
PROPERTY RIGHTS.
Entering into USB Adopters Agreements may, however, allow a signing company to participate in a
reciprocal, RAND-Z licensing arrangement for compliant products. For more information, please see:
https://www.usb.org/documents
IEC DOES NOT TAKE ANY POSITION AS TO WHETHER IT IS ADVISABLE FOR YOU TO ENTER
INTO ANY USB ADOPTERS AGREEMENTS OR TO PARTICIPATE IN THE USB IMPLEMENTERS
FORUM.”
---------------------- Page: 6 ----------------------
IEC 62680-4-1:2022 - 5 -
© USB-IF 2021
Universal Serial Bus 4 (USB4™)
Specification
Apple Inc.
HP Inc.
Intel Corporation
Microsoft Corporation
Renesas Corporation
STMicroelectronics
Texas Instruments
Version 1.0 with Errata and ECN through May 19, 2021
May 2021
---------------------- Page: 7 ----------------------
- 6 - IEC 62680-4-1:2022
© USB-IF 2021
Release History
Version Comments Issue Date
1.0 First release August 2019
1.0 with Errata and ECN through Includes errata and ECN through May 4, June 2020
May 4, 2020 2020 as part of the specification text.
1.0 with Errata and ECN through Includes errata and ECN through October October 2020
October 15, 2020 15, 2020 as part of the specification text.
1.0 with Errata and ECN through Includes errata and ECN through May 19, May 2021
May 19, 2021 2021 as part of the specification text.
---------------------- Page: 8 ----------------------
IEC 62680-4-1:2022 - 7 -
© USB-IF 2021
NOTE: Adopters may only use this USB specification to implement USB or third party functionality as
expressly described in this Specification; all other uses are prohibited.
LIMITED COPYRIGHT LICENSE: The Promoters grant a conditional copyright license under the
copyrights embodied in this USB Specification to use and reproduce the Specification for the sole
purpose of, and solely to the extent necessary for, evaluating whether to implement the
Specification in products that would comply with the specification. Without limiting the foregoing,
use of the Specification for the purpose of filing or modifying any patent application to target the
Specification or USB compliant products is not authorized. Except for this express copyright license,
no other rights or licenses are granted, including without limitation any patent licenses. In order to
obtain any additional intellectual property licenses or licensing commitments associated with the
Specification a party must execute the USB Adopters Agreement. NOTE: By using the Specification,
you accept these license terms on your own behalf and, in the case where you are doing this as an
employee, on behalf of your employer.
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 FOR INFRINGEMENT OF
ANY PROPRIETARY RIGHTS, RELATING TO THE 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.
Please send comments to techsup@usb.org.
For industry information, refer to the USB Implementers Forum web page at
http://www.usb.org.
USB Type-C®, USB-C®, USB 2.0 Type-C™, and USB4™ are trademarks of the Universal
Serial Bus Implementers Forum (USB-IF). DisplayPort™ is a trademark of VESA. All product
names are trademarks, registered trademarks, or service marks of their respective owners.
Thunderbolt™ is a trademark of Intel Corporation. You may only use the Thunderbolt™
trademark or logo in conjunction with products designed to this specification that complete
proper certification and executing a Thunderbolt™ trademark license – see usb.org/compliance
for further information
Copyright © 2021, USB Promoter Group (Apple Inc., HP Inc., Intel Corporation, Microsoft
Corporation, Renesas Corporation, STMicroelectronics, and Texas Instruments).
---------------------- Page: 9 ----------------------
- 8 - IEC 62680-4-1:2022
© USB-IF 2021
Acknowledgement of Technical Contribution
The authors of this specification would like to recognize the following people who participated
in the USB4 Specification technical work group.
Apple Inc. – Promoter Company Employees
Majd Abu Tayeh Nimrod Agmon Lior Aloni Brian Baek
Omer Bar-Lev Moshe Benyamini Gopu Bhaskar Carlos Calderon
David Conroy Bill Cornelius Scott Deandrea William Ferry
Amit Flanter Itay Franko Radia Gantous Alex Gerber
Mark Goikhman Nir Guetta Yair Hershkovitz Scott Jackson
Husam Khashiboun Alan Kobayashi Alexei Kosut Christine Krause
Dmitri Krichevsky Alex Lozovik Rachel Menes Shlomi Mor
Shlomi Museri Mona Omari Tal Ostro Arie Peled
Collin Pieper Idan Reller Reese Schreiber Oleg Schtofenmaher
Etan Shirron Ori Moshe Stern Jose Tierno Maxim Tsudik
Anatoly Uskach Jeff Wilcox Dan Wilson Ohad Zalcman
HP Inc. – Promoter Company Employees
Roger Benson Marcus Benzel Alan Berkema Kenneth Chan
Frank Chen Phil Chen Hosup Chung Glen Dower
Mark Lessman Nam Nguyen Roger Pearson Kenneth Smith
Chris Tabarez
Intel Corporation – Promoter Company Employees
Nausheen Ansari Noam Arzy Alexandre Audier Binata Bhattacharyya
Huimin Chen Hengju Cheng Salauddin Choudhury John Crouter
Maxim Dan Jhuda Dayan Yoni Dishon Eran Galil
Saranya Gopal Venkataramani Raul Gutierrez Michael Gouzenfeld
Gopalakrishnan
Mickey Gutman Benjamin Hacker Yaniv Hayat Uri Hermoni
Alon Horn Abdul Ismail Abhilash K V Ziv Kabiry
Vijaykumar Kadgi Vijay Kasturi Sergey Khaykin Lev Kolomiets
Vladislav Kopzon Efraim Kugman Edmond Lau Uriel Lemberger
Yun Ling Guobin Liu Balaji Manoharan Liran Manor
Uma Medepalli Assaf Mevorach Hezi Naaman Ohad Navon
Naod Negussie CheeLim Nge Leonid Plaks Duane Quiet
Rajaram Regupathy Reuven Rozic Oren Salomon Zeeshan Sarwar
Brad Saunders Leonid Shaposhnik Ehud Shoor Ari Sharon
---------------------- Page: 10 ----------------------
IEC 62680-4-1:2022 - 9 -
© USB-IF 2021
Uri Soloveychik Einat Surijan Aviel Uzan Karthi Vadivelu
Alex Vekker Chen Vrubel Stephanie Wallick Tzewen Wang
Sarel Wechsler Ady Weiss Vitaly Zhivov Gal Yedidia
Vladimir Yudovich Aruni Nelson
Microsoft Corporation – Promoter Company Employees
Randy Aull Jim Belesiu Martin Borve Anthony Chen
Jesse Chen Matt Chung Aacer Daken Rajib Dutta
Mark Friend Philip Froese David Hargrove Robbie Harris
Kit Hui Toby Nixon Rahul Ramadas Andrea Severson
Kiran Shastry Nathan Sherman Ji Sun Shyamal Varma
Renesas Corporation – Promoter Company Employees
Tam Do Robert Dunstan Philip Leung Kiichi Muto
Ziba Nami Hajime Nozaki Raman Sargis Yoshiyuki Tomoda
Starry Tsai Jia Wei Toshifumi Yamaoka
STMicroelectronics – Promoter Company Employees
Nathalie Ballot Joel Huloux Gerard Mas
Texas Instruments – Promoter Company Employees
Mike Campbell Anant Gole Craig Greenburg Michael Koltun IV
Sai Karthik Rajaraman Anwar Sadat Cory Stewart Sue Vining
Deric Waters Gregory Watkins
Contributor Company Employees
ACON, Advanced- Victory Chen Conrad Choy Vicky Chuang
Connectek, Inc.
Jessica Feng Sharon Hsiao Wayne Wang
Advanced Micro Dennis Au Nat Barbiero Jason Chang
Devices
Michael Comai Walter Fry Will Harris
Jason Hawken Jim Hunkins Ling Kong
Scott Ogle Victor Salim Joseph Scanlon
Peter Teng
Allion Labs, Inc. Howard Chang Casper Lee Brian Shih
Analogix Greg Stewart Haijian Sui Yueke Tang
Semiconductor, Inc.
Ning Zhu
Anritsu Corporation Wataru Aoba John Jerico Custodio Kazuhiro Fujinuma
---------------------- Page: 11 ----------------------
- 10 - IEC 62680-4-1:2022
© USB-IF 2021
Hiroshi Goto Alessandro Messina Tadanori Nishikobara
Ryo Sunayama Toshihiro Suzuki Mitsuhiro Usuba
Takeshi Wada
ASMedia Technology Chang Chinyu Chang Weiyun Chen Chiahsin
Inc.
Chen Chunhung Chuang Weber Kuo Han Sung
Lin Curtis Lin ShuYu Tseng PS
Tseng YD Wei Daniel Wu ShengChung
Avery Design Systems,
Chris Browy Chilai Huang Zhihong Zeng
Inc.
BitifEye Digital Test
Sebastian Muschala Hermann Stehling
Solutions GmbH
Bizlink Technology, Morphy Hsieh Kevin Tsai
Inc. Alex Chou
Cadence Design Marcin Behrendt Jacek Duda Shikha Gupta
Systems, Inc.
Gaurav Jain Poonam Khatri Yash Kothari
Vinod Lakshman Shivaji Magadum Andy Mauffet-Smith
Rohit Mishra Uyen Nguyen Raja Pounraj
Thirumal Reddy Anand RK Anshul Shah
Neelabh Singh Ofer Steinberg Mark Summers
Claire Ying Wasiq Zia
Corigine, Inc. Kevin Fan Ali Khan Xiao Xiao
Corning Optical Mark Bradley Wojciech Giziewicz Ian McKay
Communications LLC
Jamie Silva
Cypress Mark Fu Naman Jain Savan Javia
Semiconductor
Palani Subbiah
Dell Inc. Mohammed Hijazi Tom Lanzoni Ken Nicholas
Marcin Nowak Scott Ogle Adie Tan
Lee Zaretsky
Diodes Incorporated Qun Song
DisplayLink (UK) Ltd. Pete Burgers Dan Ellis
DJI Technology Co.,
Ltd. Steve Huang
Electronics Testing
Sophia Liu
Center, Taiwan
Elka International Ltd. Alvin Cheng Chloe Hsieh Roy Ting
---------------------- Page: 12 ----------------------
IEC 62680-4-1:2022 - 11 -
© USB-IF 2021
Jui-Ming Yang
Ellisys Abel Astley Mario Pasquali Chuck Trefts
Tim Wei
Etron Technology, Inc. Andy Chen Shihmin Hsu Bryan Huang
Chien-Cheng Kuo Jen Hong Larn
Foxconn / Hon Hai Patrick Casher Joe Chen Jason Chou
Fred Fons Bob Hall Terry Little
Christine Tran A.J. Yang Jie Zheng
Fresco Logic Inc. Tim Barilovits Bob McVay Christopher Meyers
Jie Ni Jeffrey Yang
Genesys Logic, Inc. Sean Chen Gerry Chou Thomas Hsieh
Jerry Hu Perlman Hu Roy Huang
ChunYen Kuo Weddell Lee Jimmy Lin
Miller Lin D.C. Lu Greg Tu
Han Wu Yihsun Wu
Google Inc. Mark Hayter Benson Leung Raj Mojumder
David Schneider
Granite River Labs Nikhil Acharya Yun Han Ang Sandy Chang
Allen Chen Cyan Chen Swee Guan Chua
Alan Chuang Steven Lee Caspar Lin
Tim Lin Krishna Murthy Johnson Tan
Rajaraman V Chin Hun Yaep
Hotron Precision
Rosa Chen Patrick Yeh YF Zhang
Electronic Ind. Corp.
I-PEX (Dai-ichi Seiko) Alan Kinningham Ro Richard
Japan Aviation
Electronics Industry
Mark Saubert Junichi Takeuchi
Ltd.
JMicron Technology
Charon Chen Mika Cheng Kevin Liu
Corp.
Kandou Bus SA Brian Holden Hitaish Sharma David Stauffer
Andrew Stewart Mark Vennebarger
Keysight Technologies Atsushi Imaoka Biing Lin Lem Jit Lim
Inc.
Francis Liu Roland Scherzinger
---------------------- Page: 13 ----------------------
- 12 - IEC 62680-4-1:2022
© USB-IF 2021
L&T Technology Binu Chinna Thankam Sunil Kumar Siddharth Pethe
Services
Badrinath Ramachandra Arunkumar Selvam Gayathri SN
LeCroy Corporation Alan Blankman Patrick Connally Carl Damn
David Fraticelli Daniel H Jacobs Farnoosh Jafary
Tyler Joe Carlo Mazzetti Mike Micheletti
Kathryn Morales Jeff Sabuda Joseph Schachner
Chris Webb
Lenovo Toshikazu Horino Shinji Matsushima Yuuki Matsuura
Nozomu Nagata Munefumi Nakata Kazuya Shibayama
Shunki Sugai Chikara Takahashi Masahiro Tokuno
Kayanagi Tsuneo
LG Electronics Inc. Do Kyun Kim Yoon Jong Lee Seung Yoo
Lintes Technology Co., Tammy Huang Charles Kaun RD Lintes
Ltd.
Max Lo CT Pien Jin Yi Tu
Jason Yang
Lotes Co., Ltd. Regina Liu-Hwang John Lynch
Luxshare-ICT Josue Casillo CY Hsu Antony Lin
John Lin Stone Lin Scott Shuey
Eric Wen Pat Young
Maxio Technology
George Fang
(Hangzhou) Ltd.
MediaTek Inc. Henry Chen Alexyc Lin Pochou Lin
Chiachun Wang
MegaChips
Rahul Agarwal Ramesh Dandapani Satoru Kumashiro
Corporation
Ryuichi Mariizumi Sireesha Vemulapalli Nobu Yanagisawa
Mercedes-Benz
Research &
Hans Wickler
Development, North
America, Inc.
Microchip Technology Mark Bohm Atish Ghosh Fernando Gonzalez
Inc.
Mark Gordon Richard Petrie Brigham Steele
Anthony Tarascio Robert Zakowicz
Molex LLC Alan MacDougall
MQP Electronics Ltd. Sten Carlsen Pat Crowe
---------------------- Page: 14 ----------------------
IEC 62680-4-1:2022 - 13 -
© USB-IF 2021
Newnex Technology
Sam Liu
Corp.
NVIDIA Jamie Aitken Mark Overby
NXP Semiconductors Mahmoud El Sabbagh Ken Jaramillo Abhijeet Kulkarni
Vijendra Kuroodi Krishnan TN
Oculus VR LLC Marty Evans Joaquin Fierro Chao Hu
ON Semiconductor Eduardo De Reza Oscar Freitas Christian Klein
Amir Lahooti
Parade Technologies,
Jian Chen Jimmy Chiu Mark Qu
Inc.
Craig Wiley Paul Xu Kevin Yuan
Alan Yuen
Phison Electronics Jimmy Chen Ko Hong Lipp Sebastien Jean
Corp.
Stark Kuan Thomas Lee Anton Lin
Winnie Lu Wei Sui-Ning James Tsai
Michael Wu Fu-Hua Yang Chang Yuan-Cheng
Qualcomm, Inc Tomer Ben Chen Yiftach Benjamini Richard Burrows
Amit Gil James Goel Philip Hardy
Raja Jagadeesan Lalan Mishra Dmitrii Vasilchenko
Chris Wiesner
Realtek Semiconductor Chung-Chun Chen Jen Wen Chen Shen Chen
Corp.
Jonathan Chou Chang Ding Yao Feng
Bokai Huang An-Ming Lee Ray Lee
Ryan Lin Terry Lin Luobin Wang
Kay Yin Chris Zeng
Rohde & Schwarz
Johannes Ganzert Randy White
GmbH & Co. KG
Samsung Electronics Jaedeok Cha KangSeok Cho CheolYoon Chung
Co., Ltd.
Sangju Kim Termi Kwon Cheolho Lee
Edward Lee Jun Bum Lee Chahoon Park
Sunggeun Yoon
Seagate Technology Alvin Cox Paul McParland Michael Morgan
LLC
Cuong Tran
Silicon Line GmbH Ian Jackson
---------------------- Page: 15 ----------------------
- 14 - IEC 62680-4-1:2022
© USB-IF 2021
Rakesh Polasa Satish Anand Verkila
SiliConch Systems
Private Limited
Kaustubh Kumar
Softnautics LLP Hetal Jariwala Dipakkumar Modi
Bhavesh Desai
Ujjwal Talati
Ishita Shah
James McGrath
Spectra7 Microsystems
Corp.
Alex Chow
Specwerkz Sydney Fernandes Amanda Hosler Diane Lenox
Soren Petersen
STMicroelectronics Nathalie Ballot Joel Huloux Gerard Mas
Sumitomo Electric Ind.,
Ltd., Optical Comm.
Sainer Siagian Mitsuaki Tamura
R&D Lab
Synaptics Inc. Jeff Lukanc Mark Miller Prashant Shamarao
Synopsys, Inc. Prishkrit Abrol Subramaniam Jeanne Cai
Aravindhan
Jun Cao Morten Christiansen Scott Guo
Eric Huang Joseph Juan Venkataraghavan
Krishnan
Jitendra Kushwaha Behram Minwalla Saleem Mohammad
Rick Schmidt Jasjeet Singh Mahendra Singh
John Stonick Zongyao Wen Fred Yu
Madhusudan Acharya Sourabh Das Keyur Diwan
Tektronix, Inc.
Mark Guenther Abhijeet Shinde Gary Simontom
Shuhei Yamamoto
Thine Electronics, Inc.
Simon Li Jeff Mason Jacky Mo
Tyco Electronics
Corp., a TE
Tommy Yu Yuanbo Zhang Tony Zhu
Connectivity Ltd.
company
Kai Inha
Varjo Technologies
Wayne Tseng
VIA Labs, Inc.
Benjamin Pan Terrance Shih Jay Tseng
VIA Technologies, Inc.
Fong-Jim Wang
Chao-Chee Ku Jeng Cheng Liu Wayne Lo
Weltrend
Semiconductor
Ho Wen Tsai Eric Wu Randolph Wu
Simon Yeh
David Landsman Larry McMillan Rob Ryan
Western Digital
Steve Bright Zach Moore Joe O’Brien
Wilder Technologies
Majid Shayegh
---------------------- Page: 16 ----------------------
IEC 62680-4-1:2022 - 15 -
© USB-IF 2021
CONTENTS
1 Introduction . 41
1.1 Scope of the Document . 41
1.2 USB Product Compliance . 41
1.3 Document Organization . 41
1.4 Design Goals . 41
1.5 Related Documents . 41
1.6 Conventions . 42
1.6.1 Precedence . 42
1.6.2 Keywords . 42
1.6.2.1 Informative . 42
1.6.2.2 May . 42
1.6.2.3 N/A . 42
1.6.2.4 Normative . 42
1.6.2.5 Optional . 42
1.6.2.6 Reserved . 42
1.6.2.7 Shall . 42
1.6.2.8 Should . 43
1.6.3 Capitalization . 43
1.6.4 Italic Text . 43
1.6.5 Numbering . 43
1.6.6 Bit, Byte, DW, and Symbol Conventions . 43
1.6.7 Implementation Notes. 43
1.6.8 Connection Manager Notes .
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