IEC 62680-1-5:2019

IEC 62680-1-5 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –
Part 1-5: Common components – USB Audio 3.0 device class definition

Interfaces de bus universel en série pour les données et l'alimentation
électrique –
Partie 1-5: Composants communs – Définition de classes de dispositifs USB
Audio 3.0
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IEC 62680-1-5 ®
Edition 1.0 2019-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Universal serial bus interfaces for data and power –

Part 1-5: Common components – USB Audio 3.0 device class definition

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

électrique –
Partie 1-5: Composants communs – Définition de classes de dispositifs USB

Audio 3.0
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.120.20; 35.200; 29.200 ISBN 978-2-8322-7241-1

– 2 – IEC 62680-1-5:2019
© USB-IF:1997-2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER –

Part 1-5: Common components – USB Audio 3.0 device class definition

FOREWORD
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International Standard IEC 62680-1-5 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:
CDV Report on voting
100/3157/CDV 100/3227/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.
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IEC– 63 268– 0-1-5:2019 – 3 –
© USB-IF:1997-2016
The committee has decided that the contents of this document will remain unchanged until the
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the specific document. At this date, the document will be
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– 4 – IEC 62680-1-5:2019
© USB-IF:1997-2016
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 USB Device Class Definition for Audio Devices Release 3.0.
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
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Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

IEC– 65 268– 0-1-5:2019 – 5 –
© USB-IF:1997-2016
UNIVERSAL SERIAL BUS
DEVICE CLASS DEFINITION
FOR
AUDIO DEVICES
Release 3.0
September 22, 2016
Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

– 6 – IEC 62680-1-5:2019
© USB-IF:1997-2016
SCOPE OF THIS RELEASE
This document is the Release 3.0 of this Device Class Definition.
CONTRIBUTORS
Joe Scanlon Advanced Micro Devices
Rhoads Hollowell Apple Inc.
Girault Jones Apple Inc.
Matthew X. Mora Apple Inc.
Tzung-Dar Tsai C-Media Electronics, Inc.
Brad Lambert Cirrus Logic, Inc.
Dan Bogard Conexant Systems, Inc.
Pete Burgers DisplayLink (UK), Ltd.
David Roh Dolby Laboratories, Inc.
Leng Ooi Google, Inc.
Pierre-Louis Bossart Intel Corporation
David Hines Intel Corporation
Abdul Rahman Ismail (Co-Chair) Intel Corporation
Devon Worrell Intel Corporation
Chandrashekhar Rao Logitech, Inc.
Terry Moore MCCI Corporation
Alex Lin MediaTek, Inc.
Bala Sivakumar Microsoft Corporation
Geert Knapen (Co-Chair & Editor) NXP Semiconductors
PL Mobile Audio
411 E. Plumeria drive
San Jose, CA 95134, USA
E-mail: geert.knapen@nxp.com
James Goel Qualcomm, Inc.
Andre Schevciw Qualcomm, Inc.
Jin-Sheng Wang Qualcomm, Inc.
Morten Christiansen Synopsys
REVISION HISTORY
Revision Date Filename Description
1.0 Mar. 18, 98 Audio10.pdf Release 1.0
2.0 May. 31, 06 Audio20 final.pdf Release 2.0
3.0 Sep. 22, 16 Audio30.pdf Release 3.0

Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

IEC– 67 268– 0-1-5:2019 – 7 –
© USB-IF:1997-2016
Copyright © 1997-2016 USB Implementers Forum, Inc.
All rights reserved.
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IMPLEMENTATION(S) WILL NOT INFRINGE THE INTELLECTUAL PROPERTY RIGHTS OF OTHERS.
THIS SPECIFICATION IS PROVIDED “AS IS” AND WITH NO WARRANTIES, EXPRESS OR IMPLIED, STATUTORY OR
OTHERWISE. ALL WARRANTIES ARE EXPRESSLY DISCLAIMED. USB-IF, ITS MEMBERS AND THE AUTHORS OF THIS
SPECIFICATION PROVIDE NO WARRANTY OF MERCHANTABILITY, NO WARRANTY OF NON-INFRINGEMENT, NO
WARRANTY OF FITNESS FOR ANY PARTICULAR PURPOSE, AND NO WARRANTY ARISING OUT OF ANY PROPOSAL,
SPECIFICATION, OR SAMPLE.
IN NO EVENT WILL USB-IF, MEMBERS OR THE AUTHORS BE LIABLE TO ANOTHER FOR THE COST OF PROCURING
SUBSTITUTE GOODS OR SERVICES, LOST PROFITS, LOSS OF USE, LOSS OF DATA OR ANY INCIDENTAL,
CONSEQUENTIAL, INDIRECT, OR SPECIAL DAMAGES, WHETHER UNDER CONTRACT, TORT, WARRANTY, OR
OTHERWISE, ARISING IN ANY WAY OUT OF THE USE OF THIS SPECIFICATION, WHETHER OR NOT SUCH PARTY
HAD ADVANCE NOTICE OF THE POSSIBILITY OF SUCH DAMAGES.
NOTE: VARIOUS USB-IF MEMBERS PARTICIPATED IN THE DRAFTING OF THIS SPECIFICATION. CERTAIN OF
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PROPERTY RIGHTS THAT MAY BE INFRINGED IN THE IMPLEMENTATION OF THIS SPECIFICATION. PERSONS
IMPLEMENT THIS SPECIFICATION AT THEIR OWN RISK.
Dolby™, AC-3™, Pro Logic™ and Dolby Surround™ are trademarks of Dolby Laboratories, Inc.
All other product names are trademarks, registered trademarks, or service marks of their respective owners.
Please send comments via electronic mail to audio-chair@usb.org

Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.

– 8 – IEC 62680-1-5:2019
© USB-IF:1997-2016
TABLE OF CONTENTS
Scope of This Release . 6
Contributors . 6
Revision History . 6
Table of Contents . 8
List of Tables . 12
List of Figures . 14
1 Introduction . 16
1.1 Scope . 16
1.2 Purpose . 16
1.3 Related Documents . 16
1.4 Terms and Abbreviations . 16
2 Management Overview. 19
2.1 Overview of Key Differences between ADC v2.0 and v3.0 . 19
3 Functional Characteristics . 21
3.1 Introduction . 21
3.2 Basic Audio Device Definition . 23
3.3 Backwards Compatibility . 23
3.4 Audio Interface Association (AIA) and Interface Association Descriptor . 23
3.4.1 Audio Function Class . 24
3.4.2 Audio Function Subclass . 24
3.4.3 Audio Function Protocol . 24
3.5 Audio Interface Class . 24
3.6 Audio Interface Subclass . 24
3.7 Audio Interface Protocol . 25
3.8 Audio Function Category . 25
3.9 Clock Domains . 26
3.10 Power Domains . 26
3.11 Audio Synchronization Types . 26
3.11.1 Asynchronous . 26
3.11.2 Synchronous . 26
3.11.3 Adaptive . 26
3.11.4 Implications of the Different Synchronization Types . 26
3.12 Inter Channel Synchronization . 28
3.13 Audio Function Topology . 28
3.13.1 Cluster . 33
3.13.2 Input Terminal . 33
3.13.3 Output Terminal . 34
3.13.4 Mixer Unit . 35
3.13.5 Selector Unit . 35
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IEC– 69 268– 0-1-5:2019 – 9 –
© USB-IF:1997-2016
3.13.6 Feature Unit . 36
3.13.7 Sampling Rate Converter Unit . 36
3.13.8 Effect Unit . 37
3.13.9 Processing Unit . 41
3.13.10 Extension Unit . 43
3.13.11 Clock Entities . 44
3.14 Operational Model . 45
3.14.1 AudioControl Interface . 46
3.14.2 AudioStreaming Interface . 47
3.14.3 Clock Model . 48
3.14.4 Power Domains Model . 48
3.14.5 Additional Power Considerations and Requirements . 50
3.14.6 Binding between Physical Buttons and Audio Controls . 50
4 Descriptors . 52
4.1 Standard Descriptors . 52
4.2 Class-Specific Descriptors . 52
4.2.1 Traditional Class-Specific Descriptors . 53
4.2.2 High Capability Class-Specific Descriptors . 53
4.3 Cluster Descriptor . 54
4.3.1 Cluster Descriptor Header . 55
4.3.2 Cluster Descriptor Block . 55
4.3.3 Example Cluster descriptor . 63
4.3.4 CEA-861.2 Channel Mapping . 64
4.4 Physical versus Logical Cluster . 65
4.4.1 Mapping between Physical and Logical Clusters . 65
4.5 AudioControl Interface Descriptors . 67
4.5.1 Standard AC Interface Descriptor. 67
4.5.2 Class-Specific AC Interface Descriptor . 68
4.6 AudioControl Endpoint Descriptors . 98
4.6.1 AC Control Endpoint Descriptors . 98
4.6.2 AC Interrupt Endpoint Descriptors . 98
4.7 AudioStreaming Interface Descriptors . 98
4.7.1 Standard AS Interface Descriptor . 99
4.7.2 Class-Specific AS Interface Descriptor . 99
4.7.3 Class-Specific AS Valid Frequency Range Descriptor . 100
4.8 AudioStreaming Endpoint Descriptors . 101
4.8.1 AS Isochronous Audio Data Endpoint Descriptors . 101
4.8.2 AS Isochronous Feedback Endpoint Descriptor . 102
4.9 Class-specific String descriptors . 103
5 Requests . 105
5.1 Standard Requests . 105
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– 10 – IEC 62680-1-5:2019
© USB-IF:1997-2016
5.2 Class-Specific Requests . 105
5.2.1 AudioControl Requests . 106
5.2.2 AudioStreaming Requests . 130
5.2.3 Additional Requests . 132
6 Interrupts . 135
6.1 Interrupt Data Message . 135
6.2 Interrupt Sources . 137
Appendix A. Audio Device Class Codes . 138
A.1 Audio Function Class Code . 138
A.2 Audio Function Subclass Codes . 138
A.3 Audio Function Protocol Codes . 138
A.4 Audio Interface Class Code. 138
A.5 Audio Interface Subclass Codes . 139
A.6 Audio Interface Protocol Codes . 139
A.7 Audio Function Category Codes . 139
A.8 Audio Class-Specific Descriptor Types . 140
A.9 Cluster Descriptor Subtypes . 140
A.10 Cluster Descriptor Segment types . 140
A.11 Channel Purpose Definitions . 141
A.12 Channel Relationship Definitions . 141
A.13 Ambisonic Component Ordering Convention Types . 143
A.14 Ambisonic Normalization Types . 143
A.15 Audio Class-Specific AC Interface Descriptor Subtypes. 144
A.16 Audio Class-Specific AS Interface Descriptor Subtypes . 144
A.17 Audio Class-Specific String descriptor Subtypes . 144
A.18 Extended Terminal Segment Types . 145
A.19 Effect Unit Effect Types . 145
A.20 Processing Unit Process Types . 145
A.21 Audio Class-Specific Endpoint Descriptor Subtypes . 146
A.22 Audio Class-Specific Request Codes . 146
A.23 Control Selector Codes . 146
A.23.1 AudioControl Interface Control Selectors . 146
A.23.2 Clock Source Control Selectors . 146
A.23.3 Clock Selector Control Selectors . 146
A.23.4 Clock Multiplier Control Selectors . 147
A.23.5 Terminal Control Selectors . 147
A.23.6 Mixer Control Selectors . 147
A.23.7 Selector Control Selectors . 147
A.23.8 Feature Unit Control Selectors . 148
A.23.9 Effect Unit Control Selectors . 148
A.23.10 Processing Unit Control Selectors . 150
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IEC– 611268 – 0-1-5:2019 – 11 –
© USB-IF:1997-2016
A.23.11 Extension Unit Control Selectors . 150
A.23.12 AudioStreaming Interface Control Selectors . 150
A.23.13 Endpoint Control Selectors . 151
A.24 Connector Types . 151

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– 12 – IEC 62680-1-5:2019
© USB-IF:1997-2016
LIST OF TABLES
Table 4-1: Traditional Class-Specific Descriptor Layout . 53
Table 4-2: High Capability Class-Specific Descriptor Layout . 54
Table 4-3: Cluster Descriptor Header . 55
Table 4-4: Cluster Descriptor Segment . 56
Table 4-5: End Segment . 57
Table 4-6: Cluster Description Segment . 57
Table 4-7: Vendor-defined Segment . 57
Table 4-8: Channel Relationships . 58
Table 4-9: Information Segment . 62
Table 4-10: Ambisonic Segment . 62
Table 4-11: Channel Description Segment . 63
Table 4-12: Vendor-defined Segment . 63
Table 4-13: Cluster Descriptor Example . 63
Table 4-14: Standard AC Interface Descriptor . 67
Table 4-15: Class-Specific AC Interface Header Descriptor . 68
Table 4-16: Input Terminal Descriptor . 70
Table 4-17: Output Terminal Descriptor . 71
Table 4-18: Extended Terminal Descriptor Header . 72
Table 4-19: Cluster Descriptor Segment . 73
Table 4-20: End Segment . 73
Table 4-21: Vendor-defined Segment . 74
Table 4-22: Bandwidth Segment . 74
Table 4-23: Magnitude Segment . 75
Table 4-24: Magnitude/Phase Segment . 75
Table 4-25: Position Segment . 76
Table 4-26: Position Segment . 76
Table 4-27: Vendor-defined Segment . 76
Table 4-28: Connectors Descriptor . 77
Table 4-29: Mixer Unit Descriptor . 81
Table 4-30: Selector Unit Descriptor . 82
Table 4-31: Feature Unit Descriptor . 83
Table 4-32: Sampling Rate Converter Unit Descriptor . 84
Table 4-33: Effect Unit Descriptor . 85
Table 4-34: Parametric Equalizer Section Effect Unit Descriptor . 86
Table 4-35: Reverberation Effect Unit Descriptor . 87
Table 4-36: Modulation Delay Effect Unit Descriptor . 88
Table 4-37: Dynamic Range Compressor Effect Unit Descriptor. 89
Table 4-38: Common Part of the Processing Unit Descriptor . 90
Table 4-39: Up/Down-mix Processing Unit Descriptor . 91
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IEC– 613268 – 0-1-5:2019 – 13 –
© USB-IF:1997-2016
Table 4-40: Stereo Extender Processing Unit Descriptor . 92
Table 4-41: Multi-Function Processing Unit Descriptor . 93
Table 4-42: Extension Unit Descriptor . 94
Table 4-43: Clock Source Descriptor . 95
Table 4-44: Clock Selector Descriptor . 96
Table 4-45: Clock Multiplier Descriptor . 96
Table 4-46: Power Domain Descriptor . 97
Table 4-47: Standard AC Interrupt Endpoint Descriptor . 98
Table 4-48: Standard AS Interface Descriptor . 99
Table 4-49: Class-Specific AS Interface Descriptor . 100
Table 4-50: Class-Specific AS Valid Frequency Range Descriptor . 100
Table 4-51: Standard AS Isochronous Audio Data Endpoint Descriptor . 101
Table 4-52: Class-Specific AS Isochronous Audio Data Endpoint Descriptor . 102
Table 4-53: Standard AS Isochronous Feedback Endpoint Descriptor . 103
Table 4-54: Class-specific String Descriptor . 104
Table 5-1: Request Layout . 107
Table 5-2: 1-byte Control CUR Parameter Block . 108
Table 5-3: 1-byte Control RANGE Parameter Block . 109
Table 5-4: 2-byte Control CUR Parameter Block . 109
Table 5-5: 2-byte Control RANGE Parameter Block . 109
Table 5-6: 4-byte Control CUR Parameter Block . 110
Table 5-7: 4-byte Control RANGE Parameter Block . 110
Table 5-8: INTEN Parameter Block . 110
Table 5-9: Insertion Control CUR Parameter Block . 113
Table 5-10: Band Numbers and Center
...