1、 IEC 62680-2-1 Edition 1.0 2015-09 INTERNATIONAL STANDARD Universal serial bus interfaces for data and power Part 2-1: Universal Serial Bus Specification, Revision 2.0 IEC 62680-2-1:2015-09(en) colour inside THIS PUBLICATION IS COPYRIGHT PROTECTED Copyright 2015 IEC, Geneva, Switzerland All rights r
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12、colour inside 2 IEC 62680-2-1:2015 IEC 2015 USB-IF 2014 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ UNIVERSAL SERIAL BUS INTERFACES FOR DATA AND POWER Part 2-1: Universal Serial Bus Specification, Revision 2.0 FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organizatio
13、n 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 pu
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21、d IEC National Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) A
22、ttention 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
23、. IEC shall not be held responsible for identifying any or all such patent rights. International Standard IEC 62680-2-1 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
24、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. IEC 62680-2-1:2015 IEC 2015 3 USB-IF 2014 The text of this standard
25、is based on the following documents: CDV Report on voting 100/2331/CDV 100/2434/RVC 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 U
26、niversal 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 website under “http:/webstore.iec.ch“ in the data related to the specific publication
27、. At this date, the publication will be reconfirmed, withdrawn, replaced by a revised edition, or amended. A bilingual version of this publication may be issued at a later date. IMPORTANT The colour inside logo on the cover page of this publication indicates that it contains colours which are consid
28、ered to be useful for the correct understanding of its contents. Users should therefore print this document using a colour printer. 4 IEC 62680-2-1:2015 IEC 2015 USB-IF 2014 INTRODUCTION The IEC 62680 series is based on a series of specifications that were originally developed by the USB Implementer
29、s 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.
30、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 pa
31、ssed 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
32、, 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 R
33、IGHTS. 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 D
34、OES 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 62680-1-1, Universal Serial B
35、us interfaces for data and power Part 1-1: Common components USB Battery Charging Specification, Revision 1.2 IEC 62680-2-1, Universal Serial Bus interfaces for data and power Part 2-1: Universal Serial Bus Specification, Revision 2.0 IEC 62680-2-2, Universal Serial Bus interfaces for data and power
36、 Part 2-2: USB Micro- USB Cables and Connectors Specification, Revision 1.01 IEC 62680-2-3, Universal Serial Bus interfaces for data and power Part 2-3: Universal Serial Bus Cables and Connectors Class Document, Revision 2.0 This part of the IEC 62680 series consists of several distinct parts: the m
37、ain body of the text, which consists of the original specification and all ECN and Errata developed by the USB-IF. IEC 62680-2-1:2015 IEC 2015 5 USB-IF 2014 CONTENTS FOREWORD . 2 INTRODUCTION . 4 1 Chapter 1 Introduction 29 1.1 Motivation . 29 1.2 Objective of the Specification 29 1.3 Scope of the D
38、ocument . 30 1.4 USB Product Compliance 30 1.5 Document Organization 30 2 Chapter 2 Terms and Abbreviations 31 3 Chapter 3 Background 37 3.1 Goals for the Universal Serial Bus 37 3.2 Taxonomy of Application Space 37 3.3 Feature List 38 4 Chapter 4 Architectural Overview . 40 4.1 USB System Descripti
39、on . 40 4.1.1 Bus Topology 40 4.2 Physical Interface . 41 4.2.1 Electrical . 42 4.2.2 Mechanical 42 4.3 Power . 42 4.3.1 Power Distribution . 43 4.3.2 Power Management . 43 4.4 Bus Protocol . 43 4.5 Robustness . 43 4.5.1 Error Detection 44 4.5.2 Error Handling . 44 4.6 System Configuration 44 4.6.1
40、Attachment of USB Devices . 44 4.6.2 Removal of USB Devices . 44 4.6.3 Bus Enumeration . 45 4.7 Data Flow Types . 45 4.7.1 Control Transfers . 45 4.7.2 Bulk Transfers . 45 4.7.3 Interrupt Transfers . 45 4.7.4 Isochronous Transfers . 46 4.7.5 Allocating USB Bandwidth . 46 4.8 USB Devices . 46 4.8.1 D
41、evice Characterizations . 46 4.8.2 Device Descriptions . 47 4.9 USB Host: Hardware and Software 49 4.10 Architectural Extensions . 49 5 Chapter 5 USB Data Flow Model . 50 5.1 Implementer Viewpoints 50 5.2 Bus Topology 51 5.2.1 USB Host 52 5.2.2 USB Devices . 52 6 IEC 62680-2-1:2015 IEC 2015 USB-IF 2
42、014 5.2.3 Physical Bus Topology 53 5.2.4 Logical Bus Topology 54 5.2.5 Client Software-to-function Relationship 55 5.3 USB Communication Flow . 55 5.3.1 Device Endpoints . 57 5.3.2 Pipes . 58 5.3.3 Frames and Microframes . 60 5.4 Transfer Types 60 5.4.1 Table Calculation Examples. 61 5.5 Control Tra
43、nsfers 62 5.5.1 Control Transfer Data Format 62 5.5.2 Control Transfer Direction 63 5.5.3 Control Transfer Packet Size Constraints 63 5.5.4 Control Transfer Bus Access Constraints . 64 5.5.5 Control Transfer Data Sequences 66 5.6 Isochronous Transfers 67 5.6.1 Isochronous Transfer Data Format. 67 5.
44、6.2 Isochronous Transfer Direction 67 5.6.3 Isochronous Transfer Packet Size Constraints . 67 5.6.4 Isochronous Transfer Bus Access Constraints . 69 5.6.5 Isochronous Transfer Data Sequences 70 5.7 Interrupt Transfers 70 5.7.1 Interrupt Transfer Data Format 70 5.7.2 Interrupt Transfer Direction 70 5
45、.7.3 Interrupt Transfer Packet Size Constraints. 70 5.7.4 Interrupt Transfer Bus Access Constraints . 71 5.7.5 Interrupt Transfer Data Sequences 74 5.8 Bulk Transfers 74 5.8.1 Bulk Transfer Data Format . 74 5.8.2 Bulk Transfer Direction 74 5.8.3 Bulk Transfer Packet Size Constraints . 74 5.8.4 Bulk
46、Transfer Bus Access Constraints . 75 5.8.5 Bulk Transfer Data Sequences 76 5.9 High-Speed, High Bandwidth Endpoints 77 5.9.1 High Bandwidth Interrupt Endpoints . 77 5.9.2 High Bandwidth Isochronous Endpoints . 78 5.10 Split Transactions . 79 5.11 Bus Access for Transfers 79 5.11.1 Transfer Managemen
47、t 80 5.11.2 Transaction Tracking . 82 5.11.3 Calculating Bus Transaction Times 84 5.11.4 Calculating Buffer Sizes in Functions and Software . 86 5.11.5 Bus Bandwidth Reclamation 86 5.12 Special Considerations for Isochronous Transfers. 86 5.12.1 Example Non-USB Isochronous Application . 88 5.12.2 US
48、B Clock Model . 89 5.12.3 Clock Synchronization . 91 5.12.4 Isochronous Devices . 91 5.12.5 Data Prebuffering 99 IEC 62680-2-1:2015 IEC 2015 7 USB-IF 2014 5.12.6 SOF Tracking 100 5.12.7 Error Handling . 100 5.12.8 Buffering for Rate Matching . 101 6 Chapter 6 Mechanical 103 6.1 Architectural Overvie
49、w 103 6.2 Keyed Connector Protocol 103 6.3 Cable 104 6.4 Cable Assembly 104 6.4.1 Standard Detachable Cable Assemblies 104 6.4.2 High-/full-speed Captive Cable Assemblies 106 6.4.3 Low-speed Captive Cable Assemblies . 108 6.4.4 Prohibited Cable Assemblies . 110 6.5 Connector Mechanical Configuration and Material Requirements 110 6.5.1 USB Icon Location . 111 6.5.2 USB Connector Termination Data 111 6.5.3 Series “A” and Series “B” Receptacles . 112 6.5.4 Series “A” and Series “B” Plugs . 11
