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MindShare,Inc(r)SINGLE-USERLICENSEAGREEMENTPleasereadthisdocumentcarefullybeforeproceeding.ThisAgreementlicensesthiselectronicbooktoyouandcontainswarrantyandliabilitydisclaimers.Byviewingthisbook,youarecon-firmingyouracceptanceofthebookandagreeingtobecomeboundbythetermsofthisAgree-ment.Ifyoudonotwishtodoso,immediatelyreturnthebooktoMindShare,Inc.1.DEFINITIONS(a)"bookorelectronicbook"meanstheelectronicbookcoveredbythisAgreement,andanyrelatedupdatessuppliedbyMindShare,Inc.ThebookconsistsoftheencryptedPDFfilesuppliedinelectronicform.2.LICENSEThisAgreementallowstheSINGLEEND-USERto:(a)Viewthebookonacomputerorastand-aloneebookviewer.(b)Youmaymakeanddistributecopiesofthebookandelectronicallytransferthebookfromonecomputertoanotheroroveranetwork.(c)CertainrightsarenotgrantedunderthisAgreement,butmaybeavailableunderaseparateagreement.IfyouwouldliketoenterintoaSiteorNetworkLicense,pleasecontactMindShare.3.RESTRICTIONS(a)Youmaynotcopyscreenimagesofthebook,oranyportionthereof.(b)Youmaynotdecompile,reverseengineer,disassemble,orotherwisereducethebooktoahuman-perceivableform.(c)Youmaynotmodify,rent,resellforprofit,distributeorcreatederivativeworksbaseduponthebookoranypartthereof.(d)Youwillnotexportorreexport,directlyorindirectly,thebookintoanycountryprohibitedbytheUnitedStatesExportAdministrationActandtheregulationsthereunder.(e)Thebookmaynotbeusedinagroupviewingenvironment.4.OWNERSHIPTheforegoinglicensegivesyoulimitedrightstousethebook.Youdonotbecometheownerof,andMindShareretainstitleto,theintellectualpropertycontainedwithinthebook,andallcopiesthereof.AllrightsnotspecificallygrantedinthisAgreement,includingFederalandInternationalCopyrights,arereservedbyMindShare.5.DISCLAIMEROFWARRANTIESANDOFTECHNICALSUPPORT:Thebookisprovidedtoyouonan"ASIS"basis,withoutanytechnicalsupportorwarrantyofanykindfromMindShareincluding,withoutlimitation,awarrantyofmerchantability,fitnessforaparticularpurposeandnon-infringement.SOMESTATESDONOTALLOWTHEEXCLU-SIONOFIMPLIEDWARRANTIES,SOTHEABOVEEXCLUSIONMAYNOTAPPLYTOYOU.YOUMAYALSOHAVEOTHERLEGALRIGHTSWHICHVARYFROMSTATETOSTATE.Theselimitationsorexclusionsofwarrantiesandliabilitydonotaffectorprejudicethestatutoryrightsofaconsumer;i.e.,apersonacquiringgoodsotherwisethaninthecourseofabusiness.6.LIMITATIONOFDAMAGES:MINDSHARESHALLNOTBELIABLEFORANYINDIRECT,SPECIAL,INCIDENTALORCONSEQUENTIALDAMAGESORLOSS(INCLUDINGDAMAGESFORLOSSOFBUSI-NESS,LOSSOFPROFITS,ORTHELIKE),WHETHERBASEDONBREACHOFCON-TRACT,TORT(INCLUDINGNEGLIGENCE),PRODUCTLIABILITYOROTHERWISE,EVENIFMINDSHAREORITSREPRESENTATIVESHAVEBEENADVISEDOFTHEPOS-SIBILITYOFSUCHDAMAGES.SOMESTATESDONOTALLOWTHELIMITATIONOREXCLUSIONOFLIABILITYFORINCIDENTALORCONSEQUENTIALDAMAGES,SOTHISLIMITATIONOREXCLUSIONMAYNOTAPPLYTOYOU.Thelimitedwarranty,exclusiveremediesandlimitedliabilitysetforthabovearefundamentalelementsofthebasisofthebargainbetweenMindshareandyou.YouagreethatMindsharewouldnotbeabletoprovidethebookonaneconomicbasiswithoutsuchlimitations.7.GOVERNMENTENDUSERS(USAonly):RESTRICTEDRIGHTSLEGENDThebookis"RestrictedComputerSoftware."Use,duplica-tion,ordisclosurebytheU.S.GovernmentissubjecttorestrictionsassetforthinthisAgreementandasprovidedinDFARS227.7202-1(a)and227.7202-3(a)(1995),DFARS252.227-7013(OCT1988),FAR12.212(a)(1995),FAR52.227-19,orFAR52.227-14,asapplicable."Manufac-turer:Mindshare,Inc.,4285SlashPineDrive,ColoradoSprings,CO80908.8.GENERAL:ThisAgreementshallbegovernedbytheinternallawsoftheStateofColorado.ThisAgreementcontainsthecompleteagreementbetweenthepartieswithrespecttothesubjectmatterhereof,andsupersedesallpriororcontemporaneousagreementsorunderstandings,whetheroralorwritten.AllquestionsconcerningthisAgreementshallbedirectedto:Mindshare,Inc.,4285SlashPineDrive,ColoradoSprings,CO80908,Attention:ChiefFinancialOfficer.MindshareisregisteredtrademarkofMindshare,Inc.Single-UserLicenseAgreement9/8/00.USBRSystemArchitecture(USB2.0)MINDSHARE,INC.DonAndersonADDISON-WESLEYDEVELOPER’SPRESSeading,Massachusetts•Harlow,England•MenloPark,CaliforniaBerkeley,California•DonMills,Ontario•SydneyBonn•Amsterdam•Tokyo•MexicoCityManyofthedesignationsusedbymanufacturersandsellerstodistinguishtheirproductsareclaimedastrademarks.Wherethosedesignatorsappearinthisbook,andAddison-Wesleywasawareofthetrademarkclaim,thedesignationshavebeenprintedininitialcapitallettersorallcapitalletters.TheauthimpliedassumedtheinfoLibraryISBN:0CopyrigAllrightransmitotherwisAmericaSponsorProjectCoverDSetin112345FirstPriAddisonnizationDepartmFindA-http://worsandpublishershavetakencareinpreparationofthisbook,butmakenoexpressedorwarrantyofanykindandassumenoresponsibilityforerrorsoromissions.Noliabilityisforincidentalorconsequentialdamagesinconnectionwithorarisingoutoftheuseofrmationorprogramscontainedherein.ofCongressCataloging-in-PublicationData-201-46137-4ht2001byMindShare,Inc.tsreserved.Nopartofthispublicationmaybereproduced,storedinaretrievalsystem,orted,inanyformorbyanymeans,electronic,mechanical,photocopying,recording,ore,withoutthepriorwrittenpermissionofthepublisher.PrintedintheUnitedStatesof.PublishedsimultaneouslyinCanada.ingEditor:Manager:esign:0pointPalatinobyMindShare,Inc.6789-MA-999897nting,March,2001-Wesleybooksavailableforbulkpurchasesbycorporations,institutions,andotherorga-s.FormoreinformationpleasecontacttheCorporate,Government,andSpecialSalesentat(800)238-9682.WDeveloper’sPressontheWorld-WideWebat:ww.awl.com/devpress/ForSusanKathleenContentsAboutThisBookTheMindShareArchitectureSeries.......................................................................................1CautionaryNote.........................................................................................................................2SpecifiOrganiWhoShPrerequDocumHeBinDecBitsIdentifsignalsVisitOWeWaChapShortcoLimEndCosTheUSEnhHovcationsThisBookisBasedOn...................................................................................3zationofThisBook.......................................................................................................3PartOne:OverviewofUSB2.0...................................................................................3PartTwo:Low-&Full-SpeedDeviceOperation.....................................................4PartIII:High-SpeedDeviceOperation......................................................................5PartIV:USB2.0HubOperationwithLS/FS/HSDevices.....................................5PartVI:USBSoftwareOverview................................................................................6Appendices....................................................................................................................7ouldReadthisBook....................................................................................................7isiteKnowledge...........................................................................................................7entationConventions...................................................................................................8xadecimalNotation........................................................................................................8aryNotation....................................................................................................................8imalNotation.................................................................................................................8VersusByteNotation...................................................................................................8icationofBitFields(logicalgroupsofbitsor).........................................................................................................................................9urWebPage...................................................................................................................9ntYourFeedback...........................................................................................................9PartOneOverviewofUSB2.0ter1:DesignGoalsofUSBmingsoftheOriginalPCI/OParadigm................................................................13itedSystemResources................................................................................................14Interrupts.....................................................................................................................15I/OAddresses.............................................................................................................16Non-shareableInterfaces...........................................................................................16UserConcerns............................................................................................................16CableCrazed...............................................................................................................17InstallationandConfigurationofExpansionCards..............................................17NoHotAttachmentofPeripherals..........................................................................17t......................................................................................................................................18BParadigm...................................................................................................................18ancedSystemPerformance........................................................................................19tPlugandPlaySupport..............................................................................................20ContentsviExpandability......................................................................................................................20LegacyHardware/SoftwareSupport.............................................................................20LowCost.............................................................................................................................21SummaryofKeyUSBFeatures........................................................................................23HowtoGettheUSBSpecifications......................................................................................24ChapOverviUSB1.xLowHoShaBan2.0SysLowHigHigThePlaUSUSUSUSUSUSUSBCoComTrater2:TheBigPictureew....................................................................................................................................25SystemsandDevices................................................................................................28-SpeedandFull-SpeedDevices................................................................................28wTransactionsAreGenerated...................................................................................30WhattheDescriptorsContain...................................................................................30HowtheTransferDescriptorsAreFetched............................................................30FrameGeneration.......................................................................................................33ringtheBus...................................................................................................................34dwidthConsiderationSummary..............................................................................34temsandDevices.........................................................................................................37-SpeedandFull-SpeedDevicesina2.0System....................................................38Example2.0HostControllerSupportforLS/FSDevices....................................40h-SpeedDevicesina2.0System...............................................................................41High-SpeedDevicesAttachedto1.xPorts.............................................................41High-SpeedTransactionsandMicroframeGeneration........................................42h-SpeedBandwidthSummary..................................................................................42yers................................................................................................................................44BClientDrivers.............................................................................................................45BBusDriver...................................................................................................................46BHostControllerDriver.............................................................................................46BHostController/RootHub......................................................................................47TheHostController....................................................................................................47TheRootHub..............................................................................................................48BHubs...........................................................................................................................49HubController............................................................................................................51HubRepeater...............................................................................................................52Hub’sRoleinConfiguration.....................................................................................53BDevices........................................................................................................................53High-SpeedDevices...................................................................................................53Full-SpeedDevices.....................................................................................................53Low-SpeedDevices....................................................................................................53mmunicationsModel................................................................................................54municationsFlow......................................................................................................54nsfers,IRPs,Frames,andPackets..............................................................................55Transfers.......................................................................................................................55ContentsTheUSBDriver,IRPs,andFrames..........................................................................57TheHostControllerDriverandTransactions........................................................59TheHostControllerandPackets..............................................................................60DeviceFramework(howdevicespresentthemselvestosoftware)................................60DeviceDescriptors.............................................................................................................60DevUSBPeFulHigTopoloChapTheCoSerSerCablesLowFulCabElectricChapUSBPoHubs...CuOvVoPowBus-PoPowBusBusBusCuBus-PoLowviiiceFramework.............................................................................................................63USBBusInterfaceLayer............................................................................................63USBDeviceLayer.......................................................................................................64FunctionLayer............................................................................................................65ripheralConnection...................................................................................................66l-SpeedHubs.................................................................................................................66h-SpeedHubs...............................................................................................................67High-SpeedDevices...................................................................................................67Low-andFull-SpeedDevices...................................................................................67gy....................................................................................................................................67ter3:CablesandConnectorsnnectors.........................................................................................................................69iesAConnectors...........................................................................................................71iesBConnectors............................................................................................................71.........................................................................................................................................71-SpeedCables..............................................................................................................72l-andHigh-SpeedCables...........................................................................................73lePower........................................................................................................................74alandMechanicalSpecifications............................................................................74ter4:USBCablePowerDistributionwer.................................................................................................................................75.........................................................................................................................................76rrentBudget...................................................................................................................76er-CurrentProtection...................................................................................................78ltageDropBudget.........................................................................................................78erSwitching................................................................................................................79weredHubs..................................................................................................................80erDuringHubConfiguration..................................................................................80-PoweredHubAttachedto500maPort...................................................................80-PoweredHubAttachedt

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