Universal serial bus interfaces for data and power - Part 1-5: Common components - USB Audio 3.0 device class definition

IEC 62680-1-5:2019 describes the minimum capabilities and characteristics an audio device shall support to comply with the USB. This document also provides recommendations for optional features.
The Audio Device Class Definition applies to all devices or functions embedded in composite devices that are used to manipulate audio, voice, and sound-related functionality. This includes both audio data (analog and digital) and the functionality that is used to directly control the audio environment, such as Volume and Tone Control. The Audio Device Class does not include functionality to operate transport mechanisms that are related to the reproduction of audio data, such as tape transport mechanisms or CD-ROM drive control.

Interfaces du 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

L'IEC 62680-1-5:2019 décrit les capacités et caractéristiques minimales qu'un dispositif audio doit prendre en charge pour être conforme à l'USB. Le présent document fournit également des recommandations concernant les fonctionnalités facultatives.
La définition de classes de dispositifs audio s'applique à tous les dispositifs ou fonctions intégrés dans des dispositifs composites qui sont utilisés pour manipuler des fonctionnalités audio, vocales et sonores. Cela inclut à la fois les données audio (analogiques et numériques) et les fonctionnalités utilisées pour contrôler directement l'environnement audio, comme les commandes de volume et de tonalité. La classe des dispositifs audio n'inclut pas de fonctionnalité permettant d'utiliser des mécanismes de transport liés à la reproduction de données audio, comme les mécanismes de transport de bande ou la commande d'un lecteur de CD-ROM.

General Information

Status
Published
Publication Date
18-Sep-2019
Current Stage
PPUB - Publication issued
Completion Date
19-Sep-2019
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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
IEC 62680-1-5:2019-09(en-fr)
---------------------- Page: 1 ----------------------
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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
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© 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

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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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© USB-IF:1997-2016

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© 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

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Copyright © 1997-2016 USB Implementers Forum, Inc. All rights reserved.
---------------------- Page: 6 ----------------------
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.
---------------------- Page: 7 ----------------------
– 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.
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IEC– 67 268– 0-1-5:2019 – 7 –
© USB-IF:1997-2016
Copyright © 1997-2016 USB Implementers Forum, Inc.
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Please send comments via electronic mail to audio-chair@usb.org
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– 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

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

...

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