USB30中英文翻译 2Word格式.docx

USB30中英文翻译 2Word格式.docx

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ThelackofflexibilityinreconfiguringthePChadbeenacknowledgedastheAchilles’heelto

itsfurtherdeployment.Thecombinationofuser-friendlygraphicalinterfacesandthehardwareandsoftwaremechanismsassociatedwithnew-generationbusarchitectureshavemadecomputerslessconfrontationalandeasiertoreconfigure.However,fromtheenduser’spointofview,thePC’sI/Ointerfaces,suchasserial/parallelports,keyboard/mouse/joystick

interfaces,etc.,didnothavetheattributesofplug-and-play.

•PortExpansion

Theadditionofexternalperipheralscontinuedtobeconstrainedbyportavailability.Thelack

ofabidirectional,low-cost,low-to-midspeedperipheralbusheldbackthecreativeproliferationofperipheralssuchasstoragedevices,answeringmachines,scanners,PDA’s,

keyboards,andmice.Existinginterconnectswereoptimizedforoneortwopointproducts.As

eachnewfunctionorcapabilitywasaddedtothePC,anewinterfacehadbeendefinedto

addressthisneed.

Initially,USBprovidedtwospeeds（12Mb/sand1.5Mb/s）thatperipheralscoulduse.AsPCsbecameincreasinglypowerfulandabletoprocesslargeramountsofdata,usersneededtogetmoreandmoredataintoandoutoftheirPCs.ThisledtothedefinitionoftheUSB2.0specificationin2000toprovideathirdtransferrateof480Mb/swhileretainingbackwardcompatibility.In2005,withwirelesstechnologiesbecomingmoreandmorecapable,WirelessUSBwasintroducedtoprovideanewcablefreecapabilitytoUSB.

USBisthemostsuccessfulPCperipheralinterconnecteverdefinedandithasmigratedheavilyintotheCEandMobilesegments.In2006aloneover2billionUSBdeviceswereshippedandthereareover6billionUSBproductsintheinstalledbasetoday.Endusers“know”whatUSBis.Productdevelopersunderstandtheinfrastructureandinterfacesnecessarytobuildasuccessfulproduct.

USBhasgonebeyondjustbeingawaytoconnectperipheralstoPCs.PrintersuseUSBto

interfacedirectlytocameras.PDAsuseUSBconnectedkeyboardsandmice.TheUSBOn-The-Godefinitionprovidesawayfortwodualrolecapabledevicestobeconnectedandnegotiatewhichonewilloperateasthe“host.”USB,asaprotocol,isalsobeingpickedupandusedinmanynontraditionalapplicationssuchasindustrialautomation.

Now,astechnologyinnovationmarchesforward,newkindsofdevices,mediaformats,andlargeinexpensivestorageareconverging.Theyrequiresignificantlymorebusbandwidthtomaintaintheinteractiveexperienceusershavecometoexpect.HDCamcorderswillhavetensofgigabytesofstoragethattheuserwillwanttomovetotheirPCforediting,viewing,andarchiving.Furthermoreexistingdeviceslikestillimagecamerascontinuetoevolveandareincreasingtheirstoragecapacitytoholdevenmoreuncompressedimages.Downloadinghundredsoreventhousandsof10MB,orlarger,rawimagesfromadigitalcamerawillbeatimeconsumingprocessunlessthetransferrateisincreased.Inaddition,userapplicationsdemandahigherperformanceconnectionbetweenthePCandtheseincreasinglysophisticatedperipherals.USB3.0addressesthisneedbyaddinganevenhighertransferratetomatchthesenewusagesanddevices.

Thus,USB（wiredorwireless）continuestobetheanswertoconnectivityforPC,Consumer

Electronics,andMobilearchitectures.Itisafast,bidirectional,low-cost,dynamicallyattachableinterfacethatisconsistentwiththerequirementsofthePCplatformsoftodayandtomorrow.

1.2ObjectiveoftheSpecification

ThisdocumentdefinesthenextgenerationUSBindustry-standard,USB3.0.Thespecificationdescribestheprotocoldefinition,typesoftransactions,busmanagement,andtheprogramminginterfacerequiredtodesignandbuildsystemsandperipheralsthatarecompliantwiththisspecification

USB3.0’sgoalremainstoenabledevicesfromdifferentvendorstointeroperateinanopen

architecture,whilemaintainingandleveragingtheexistingUSBinfrastructure（devicedrivers,softwareinterfaces,etc.）.ThespecificationisintendedasanenhancementtothePCarchitecture,spanningportable,businessdesktop,andhomeenvironments,aswellassimpledevice-to-devicecommunications.ItisintendedthatthespecificationallowsystemOEMsandperipheraldevelopersadequateroomforproductversatilityandmarketdifferentiationwithouttheburdenofcarryingobsoleteinterfacesorlosingcompatibility.

1.3ScopeoftheDocument

Thespecificationisprimarilytargetedatperipheraldevelopersandplatform/adapterdevelopers,butprovidesvaluableinformationforplatformoperatingsystem/BIOS/devicedriver,adapterIHVs/ISVs,andsystemOEMs.Thisspecificationcanbeusedfordevelopingnewproductsandassociatedsoftware.

ProductdevelopersusingthisspecificationareexpectedtoknowandunderstandtheUSB2.0

Specification.Specifically,USB3.0devicesmustimplementdeviceframeworkcommandsanddescriptorsasdefinedintheUSB2.0Specification.

1.4USBProductCompliance

AdoptersoftheUSB3.0specificationhavesignedtheUSB3.0AdoptersAgreement,which

providesthemaccesstoareasonableandnondiscriminatory（RANDZ）licensefromthePromotersandotherAdopterstocertainintellectualpropertycontainedinproductsthatarecompliantwiththeUSB3.0specification.AdopterscandemonstratecompliancewiththespecificationthroughthetestingprogramasdefinedbytheUSBImplementersForum.ProductsthatdemonstratecompliancewiththespecificationwillbegrantedcertainrightstousetheUSBImplementersForumlogosasdefinedinthelogolicense.

1.5DocumentOrganization

Chapters1through4provideanoverviewforallreaders,whileChapters5through11containdetailedtechnicalinformationdefiningUSB3.0.

Readersshouldcontactoperatingsystemvendorsforoperatingsystembindingsspecificto

USB3.0.

1.6DesignGoals

USB3.0isthenextevolutionarystepforwiredUSB.ThegoalisthatendusersviewitasthesameasUSB2.0,justfaster.Severalkeydesignareastomeetthisgoalarelistedbelow:

•PreservetheUSBmodelofsmarthostandsimpledevice.

•LeveragetheexistingUSBinfrastructure.ThereareavastnumberofUSBproductsinusetoday.Alargepartoftheirsuccesscanbetracedtotheexistenceofstablesoftwareinterfaces,easilydevelopedsoftwaredevicedrivers,andanumberofgenericstandarddeviceclassdrivers（HID,massstorage,audio,etc.）.SuperSpeedUSBdevicesaredesignedtokeepthissoftwareinfrastructureintactsothatdevelopersofperipheralscancontinuetousethesameinterfacesandleveragealloftheirexistingdevelopmentwork.

•Significantlyimprovepowermanagement.Reducetheactivepowerwhensendingdataandreduceidlepowerbyprovidingarichersetofpowermanagementmechanismstoallowdevicestodrivethebusintolowerpowerstates.

•EaseofusehasalwaysbeenandremainsakeydesigngoalforallvarietiesofUSB.

•Preservetheinvestment.TherearealargenumberofPCsinusethatsupportonlyUSB2.0.TherearealargernumberofUSB2.0peripheralsinuse.RetainingbackwardcompatibilityattheType-AconnectortoallowSuperSpeeddevicestobeused,albeitatalowerspeed,withUSB2.0PCsandallowhighspeeddeviceswiththeirexistingcablestobeconnectedtotheUSB3.0SuperSpeedType-Aconnectors.

1.7RelatedDocuments

UniversalSerialBusSpecification,Revision2.0

USBOn-the-GoSupplementtotheUSB2.0Specification,Revision1.3

UniversalSerialBusMicro-USBCablesandConnectorsSpecification,Revision1.01

EIA-364-1000.01:

EnvironmentalTestMethodologyforAssessingthePerformanceofElectrical

ConnectorsandSocketsUsedinBusinessOfficeApplications

USB3.0ConnectorsandCableAssembliesComplianceDocument

USBSuperSpeedElectricalTestMethodologywhitepaper

USB3.0JitterBudgetingwhitepaper

INCITSTR-35-2004,INCITSTechnicalReportforInformationTechnology–FibreChannel–MethodologiesforJitterandSignalQualitySpecification（FC-MJSQ）

USB3.0ArchitecturalOverview

ThischapterpresentsanoverviewofUniversalSerialBus3.0architectureandkeyconcepts.USB3.0issimilartoearlierversionsofUSBinthatitisacablebussupportingdataexchangebetweenahostcomputerandawiderangeofsimultaneouslyaccessibleperipherals.Theattachedperipheralssharebandwidththroughahost-scheduledprotocol.Thebusallowsperipheralstobeattached,configured,used,anddetachedwhilethehostandotherperipheralsareinoperation.

USB3.0utilizesadual-busarchitecturethatprovidesbackwardcompatibilitywithUSB2.0.ItprovidesforsimultaneousoperationofSuperSpeedandnon-SuperSpeed（USB2.0speeds）

informationexchanges.Thischapterisorganizedintotwofocusareas.Thefirstfocuseson

architectureandconceptsrelatedtoelementswhichspanthedualbuses.ThesecondfocusesonSuperSpeedspecificarchitectureandconcepts.

LaterchaptersdescribethevariouscomponentsandspecificrequirementsofSuperSpeedUSBingreaterdetail.ThereaderisexpectedtohaveafundamentalunderstandingofthearchitecturalconceptsofUSB2.0.RefertotheUniversalSerialBusSpecification,Revision2.0forcompletedetails.

3.1USB3.0SystemDescription

USB3.0isaphysicalSuperSpeedbuscombinedinparallelwithaphysicalUSB2.0bus（see

Figure3-1）.IthassimilararchitecturalcomponentsasUSB2.0,namely:

•USB3.0interconnect

•USB3.0devices

•USB3.0host

TheUSB3.0interconnectisthemannerin

whichUSB3.0andUSB2.0devices

connecttoandcommu