IEC 62680-4-1:2022

IEC 62680-4-1 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
colour
inside
Universal Serial Bus interfaces for data and power –
Part 4-1: Universal Serial Bus 4 ™ Specification

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IEC 62680-4-1 ®
Edition 1.0 2022-10
INTERNATIONAL
STANDARD
colour
inside
Universal Serial Bus interfaces for data and power –

Part 4-1: Universal Serial Bus 4 ™ Specification

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200; 33.120.20; 35.200 ISBN 978-2-8322-5816-3

- 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
Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations
liaising with the IEC also participate in this preparation. IEC collaborates closely with the International
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
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
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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.
The text of this International Standard is based on the following documents:
Draft Report on voting
100/3754/CDV 100/3813/RVC
© 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,
• 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.

- 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.”
© 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
- 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.

© 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
Corporation, Renesas Corporation, STMicroelectronics, and Texas Instruments).

- 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 Co
...