Universal Serial Bus Specification

1 Universal Serial BusSpecificationCompaqHewlett-PackardInt elLucentMicrosoftNECP hilipsRevision 27, 2000 Universal Serial Bus Specification Revision of this RevisionThe revision of the Specification is intended for product design. Every attempt has been made to ensure aconsistent and implementable Specification . Implementations should ensure compliance with this HistoryRevisionIssue 11, 1994 Supersedes 30, 1994 Revisions to Chapters 3-8, 10, and 11. 13, 1995 Revisions to all the 25, 1995 Revisions to all the FDRN ovember 13, 1995 Revisions to Chapters 1, 2, 15, 1996 Edits to Chapters 5, 6, 7, 8, 9, 10, and 11 23, 1998 Updates to all chapters to fix problems (draft )October 5, 1999 Revisions to chapters 5, 7, 8, 9, 11 to add (draft )

2 December 21, 1999 Revisions to all chapters to add high 27, 2000 Revisions for high-speed Serial Bus SpecificationCopyright 2000, Compaq Computer Corporation,Hewlett-Packard Company, Intel Corporation, Lucent Technologies Inc,Microsoft Corporation, NEC Corporation, Koninklijke Philips Electronics rights PROPERTY DISCLAIMERTHIS Specification IS PROVIDED TO YOU AS IS WITH NO WARRANTIES WHATSOEVER,INCLUDING ANY WARRANTY OF MERCHANTABILITY, NON-INFRINGEMENT, OR FITNESS FORANY PARTICULAR PURPOSE. THE AUTHORS OF THIS Specification DISCLAIM ALL LIABILITY,INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PROPRIETARY RIGHTS, RELATING TO USEOR IMPLEMENTATION OF INFORMATION IN THIS Specification .

3 THE PROVISION OF THISSPECIFICATION TO YOU DOES NOT PROVIDE YOU WITH ANY LICENSE, EXPRESS OR IMPLIED,BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY product names are trademarks, registered trademarks, or servicemarks of their respective send comments via electronic mail to industry information, refer to the USB Implementers Forum web page at Serial Bus Specification Revision of USB Technical ContributionThe authors of this Specification would like to recognize the following people who participated in the Promoter Group technical working groups.

4 We would also like to thank others in the USB companies and throughout the industry who contributed to the development of this Working GroupJohn GarneyIntel Corporation (Chair/Editor)Ken StufflebeamCompaq Computer CorporationDavid WootenCompaq Computer CorporationMatt NiebergerHewlett-Packard CompanyJohn HowardIntel CorporationVenkat IyerIntel CorporationSteve McGowanIntel CorporationGeert KnapenRoyal Philips ElectronicsZong Liang WuRoyal Philips ElectronicsJim CleeLucent Technologies IncJim GuziakLucent Technologies IncDave ThompsonLucent Technologies IncJohn FullerMicrosoft CorporationNathan ShermanMicrosoft CorporationMark WilliamsMicrosoft CorporationNobuo FuruyaNEC CorporationToshimi SakuraiNEC CorporationMoto

5 SatoNEC CorporationKatsuya SuzukiNEC CorporationElectrical Working GroupJon LuekerIntel Corporation (Chair/Editor)David WootenCompaq Computer CorporationMatt NiebergerHewlett-Packard CompanyLarry TaugherHewlett-Packard CompanyVenkat IyerIntel CorporationSteve McGowanIntel CorporationMike PennellIntel CorporationTodd WestIntel CorporationGerrit den BestenRoyal Philips ElectronicsMarq KoleRoyal Philips ElectronicsZong Liang WuRoyal Philips ElectronicsJim CleeLucent Technologies IncJim GuziakLucent Technologies IncPar ParikhLucent Technologies IncDave ThompsonLucent Technologies IncEd GiaimoMicrosoft CorporationMark WilliamsMicrosoft CorporationToshihiko

6 OhtaniNEC CorporationKugao OuchiNEC CorporationKatsuya SuzukiNEC CorporationToshio TasakiNEC CorporationUniversal Serial Bus Specification Revision Serial Bus Specification Revision 1 .. of the Specification .. of the Document .. Product Compliance .. Organization .. 2 CHAPTER 2 TERMS AND ABBREVIATIONSCHAPTER 3 for the Universal Serial Bus .. of Application List .. 13 CHAPTER 4 ARCHITECTURAL System Description .. Topology .. Interface .. Distribution .. Management .. Protocol .. Detection .. of USB of USB Enumeration.

7 20 Universal Serial Bus Specification Revision Flow Types .. Transfers .. Transfers .. USB Devices .. Descriptions .. Host: Hardware and Architectural 5 USB DATA FLOW Topology .. Host .. Devices .. Bus Bus Topology .. Software-to-function Communication Flow .. Endpoints .. and Calculation Transfers .. Transfer Data Format .. Transfer Direction .. Transfer Packet Size Transfer Bus Access Transfer Data Sequences .. Transfer Data Format .. Transfer Direction .. Transfer Packet Size Constraints.

8 Transfer Bus Access Constraints .. Transfer Data Transfers .. Transfer Data Format .. Transfer Direction .. Transfer Packet Size Constraints .. Transfer Bus Access Constraints .. Transfer Data Sequences ..52 Universal Serial Bus Specification Revision Transfers .. Transfer Data Transfer Transfer Packet Size Constraints .. Transfer Bus Access Constraints .. Transfer Data Sequences .. , High Bandwidth Bandwidth Interrupt Endpoints .. Bandwidth Isochronous Endpoints .. Split Transactions .. Bus Access for Transfer Transaction Calculating Bus Transaction Calculating Buffer Sizes in Functions and Software.

9 Bus Bandwidth Reclamation .. Special Considerations for Isochronous Transfers .. Example Non-USB Isochronous USB Clock Model .. Clock Synchronization .. Isochronous Data Prebuffering .. SOF Tracking .. Error Buffering for Rate Matching .. 82 CHAPTER 6 Connector Protocol .. Detachable Cable Assemblies .. Captive Cable Captive Cable Assemblies .. Cable Mechanical Configuration and Material Icon Location .. Connector Termination Data .. A and Series B Receptacles.

10 A and Series B Plugs .. 98 Universal Serial Bus Specification Revision Mechanical Configuration and Material Requirements .. Characteristics .. Environmental Characteristics .. , Mechanical, and Environmental Compliance Standards .. Documents .. Grounding .. Reference 7 .. Driver Characteristics .. Signal Rise and Fall, Eye Patterns .. Characteristics .. Speed Identification .. Levels .. Encoding/Decoding .. Sync Pattern .. Data Signaling Frame Interval .. Data Source Signaling .. Hub Signaling Timings.