IEC 62680-1:2013

IEC 62680-1
®

Edition 1.0 2013-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside


Universal serial bus interfaces for data and power –
Part 1: Universal serial bus specification, revision 2.0

Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 1: Spécification du bus universel en série, révision 2.0


IEC 62680-1:2013-09(en-fr)

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IEC 62680-1

®


Edition 1.0 2013-09




INTERNATIONAL



STANDARD




NORME


INTERNATIONALE
colour

inside










Universal serial bus interfaces for data and power –

Part 1: Universal serial bus specification, revision 2.0



Interfaces de bus universel en série pour les données et l'alimentation

électrique –

Partie 1: Spécification du bus universel en série, révision 2.0















INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE

INTERNATIONALE






ICS 35.200 ISBN 978-2-8322-1083-3




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® Registered trademark of the International Electrotechnical Commission
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– 2 – IEC 62680-1:2013
 © USB-IF:2000
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 1: Universal serial bus specification, revision 2.0

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,
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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-
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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
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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 62680-1 has been prepared by technical area 14: Interfaces and
methods of measurement for personal computing equipment, of IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this standard is based on documents 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.

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IEC 62680-1:2013 – 3 –
© USB-IF:2000
The text of this standard is based on the following documents:
FDIS Report on voting
100/2156/FDIS 100/2188/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
A list of all the parts in the IEC 62680 series, published under the general title Universal serial
bus interfaces for data and power can be found on the IEC website.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.


IMPORTANT – The 'colour inside' logo on the cover page of this publication
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.

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– 4 – IEC 62680-1:2013
 © USB-IF:2000
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 to submitted to the IEC
under the auspices of a special agreement between the IEC and the USB IF.
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, royalty-free licensing arrangement for compliant products. For
more information, please see:
http://www.usb.org/developers/docs/
http://www.usb.org/developers/devclass_docs#approved

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.”

This series covers the Universal Series Bus interfaces for data and power and consists of the
following parts:
IEC 62680-1, Universal Serial Bus interfaces for data and power - Part 1: Universal Serial Bus
Specification, Revision 2.0

IEC 62680-2, Universal Serial Bus interfaces for data and power - Part 2: USB Micro-USB
Cables and Connectors Specification, Revision 1.01

IEC 62680-3, Universal Serial Bus interfaces for data and power - Part 3: USB Battery
Charging Specification, Revision 1.2

IEC 62680-4, Universal Serial Bus interfaces for data and power - Part 4: Universal Serial Bus
Cables and Connectors Class Document Revision. 2.0
This part of the IEC 62680 series consists of several distinct parts:
• the main body of the text, which consists of the original specification and all ECN and
Errata developed by the USB-IF;

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IEC 62680-1:2013 – 5 –
© USB-IF:2000
CONTENTS
1 Chapter 1 Introduction . 17
1.1 Motivation . 17
1.2 Objective of the Specification . 17
1.3 Scope of the Document . 18
1.4 USB Product Compliance . 18
1.5 Document Organization . 18
2 Chapter 2 Terms and Abbreviations . 19
3 Chapter 3 Background . 25
3.1 Goals for the Universal Serial Bus . 25
3.2 Taxonomy of Application Space. 25
3.3 Feature List . 26
4 Chapter 4 Architectural Overview . 28
4.1 USB System Description . 28
4.1.1 Bus Topology . 28
4.2 Physical Interface . 29
4.2.1 Electrical . 30
4.2.2 Mechanical . 30
4.3 Power . 30
4.3.1 Power Distribution . 31
4.3.2 Power Management . 31
4.4 Bus Protocol . 31
4.5 Robustness . 31
4.5.1 Error Detection . 32
4.5.2 Error Handling . 32
4.6 System Configuration . 32
4.6.1 Attachment of USB Devices . 32
4.6.2 Removal of USB Devices . 32
4.6.3 Bus Enumeration . 32
4.7 Data Flow Types . 33
4.7.1 Control Transfers . 33
4.7.2 Bulk Transfers . 33
4.7.3 Interrupt Transfers . 33
4.7.4 Isochronous Transfers . 33
4.7.5 Allocating USB Bandwidth . 34
4.8 USB Devices . 34
4.8.1 Device Characterizations . 34
4.8.2 Device Descriptions . 35
4.9 USB Host: Hardware and Software . 37
4.10 Architectural Extensions . 37
5 Chapter 5 USB Data Flow Model . 38
5.1 Implementer Viewpoints . 38
5.2 Bus Topology . 39
5.2.1 USB Host . 40
5.2.2 USB Devices . 40

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 © USB-IF:2000
5.2.3 Physical Bus Topology . 41
5.2.4 Logical Bus Topology . 42
5.2.5 Client Software-to-function Relationship . 43
5.3 USB Communication Flow . 43
5.3.1 Device Endpoints. 45
5.3.2 Pipes . 46
5.3.3 Frames and Microframes . 48
5.4 Transfer Types . 48
5.4.1 Table Calculation Examples . 49
5.5 Control Transfers . 50
5.5.1 Control Transfer Data Format . 50
5.5.2 Control Transfer Direction . 51
5.5.3 Control Transfer Packet Size Constraints . 51
5.5.4 Control Transfer Bus Access Constraints . 52
5.5.5 Control Transfer Data Sequences . 54
5.6 Isochronous Transfers . 55
5.6.1 Isochronous Transfer Data Format . 55
5.6.2 Isochronous Transfer Direction . 55
5.6.3 Isochronous Transfer Packet Size Constraints . 55
5.6.4 Isochronous Transfer Bus Access Constraints . 57
5.6.5 Isochronous Transfer Data Sequences . 58
5.7 Interrupt Transfers. 58
5.7.1 Interrupt Transfer Data Format . 58
5.7.2 Interrupt Transfer Direction . 58
5.7.3 Interrupt Transfer Packet Size Constraints . 58
5.7.4 Interrupt Transfer Bus Access Constraints . 59
5.7.5 Interrupt Transfer Data Sequences . 62
5.8 Bulk Transfers . 62
5.8.1 Bulk Transfer Data Format . 62
5.8.2 Bulk Transfer Direction . 62
5.8.3 Bulk Transfer Packet Size Constraints . 62
5.8.4 Bulk Transfer Bus Access Constraints . 63
5.8.5 Bulk Transfer Data Sequences . 64
5.9 High-Speed, High Bandwidth Endpoints . 65
5.9.1 High Bandwidth Interrupt Endpoints . 65
5.9.2 High Bandwidth Isochronous Endpoints . 66
5.10 Split Transactions . 67
5.11 Bus Access for Transfers . 67
5.11.1 Transfer Management . 68
5.11.2 Transaction Tracking . 70
5.11.3 Calculating Bus Transaction Times . 72
5.11.4 Calculating Buffer Sizes in Functions and Software . 74
5.11.5 Bus Bandwidth Reclamation . 74
5.12 Special Considerations for Isochronous Transfers . 74
5.12.1 Example Non-USB Isochronous Application . 75
5.12.2 USB Clock Model . 77

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IEC 62680-1:2013 – 7 –
© USB-IF:2000
5.12.3 Clock Synchronization . 79
5.12.4 Isochronous Devices . 79
5.12.5 Data Prebuffering . 87
5.12.6 SOF Tracking . 88
5.12.7 Error Handling . 88
5.12.8 Buffering for Rate Matching . 89
6 Chapter 6 Mechanical . 91
6.1 Architectural Overview . 91
6.2 Keyed Connector Protocol . 91
6.3 Cable . 92
6.4 Cable Assembly . 92
6.4.1 Standard Detachable Cable Assemblies . 92
6.4.2 High-/full-speed Captive Cable Assemblies. 94
6.4.3 Low-speed Captive Cable Assemblies . 96
6.4.4 Prohibited Cable Assemblies . 98
6.5 Connector Mechanical Configuration and Material Requirements . 98
6.5.1 USB Icon Location . 99
6.5.2 USB Connector Termination Data . 99
6.5.3 Series “A” and Series “B” Receptacles . 100
6.5.4 Series “A” and Series “B” Plugs . 103
6.6 Cable Mechanical Configuration and Material Requirements . 106
6.6.1 Description . 107
6.6.2 Construction . 107
6.6.3 Electrical Characteristics . 110
6.6.4 Cable Environmental Characteristics . 110
6.6.5 Listing . 110
6.7 Electrical, Mechanical, and Environmental Compliance Standards . 110
6.7.1 Applicable Documents . 116
6.8 USB Grounding . 116
6.9 PCB Reference Drawings . 116
7 Chapter 7 Electrical . 120
7.1 Signaling . 120
7.1.1 USB Driver Characteristics . 123
7.1.2 Data Signal Rise and Fall, Eye Patterns . 130
7.1.3 Cable Skew . 139
7.1.4 Receiver Characteristics . 139
7.1.5 Device Speed Identification . 141
7.1.6 Input Characteristics . 142
7.1.7 Signaling Levels . 145
7.1.8 Data Encoding/Decoding . 158
7.1.9 Bit Stuffing . 158
7.1.10 Sync Pattern . 160
7.1.11 Data Signaling Rate . 160
7.1.12 Frame Interval . 160
7.1.13 Data Source Signaling . 161
7.1.14 Hub Signaling Timings . 163

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– 8 – IEC 62680-1:2013
 © USB-IF:2000
7.1.15 Receiver Data Jitter . 164
7.1.16 Cable Delay . 166
7.1.17 Cable Attenuation . 167
7.1.18 Bus Turn-around Time and Inter-packet Delay . 168
7.1.19 Maximum End-to-end Signal Delay .
...