12研《嵌入式系统》课程论文嵌入式专题_USB FullSpeed_1210214001_陈胜民

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1、USBfullSpeedEmbeddedSystemStudentName:ChenShengMinStudentNo:1210214001SchoolofComputerScience&TechnologyofHuaQiaoUniversityContent1.BriefHistoryofUSB32.PhysicalbustopologyOfUSB33.LogicalbustopologyOfUSB44.SomefeaturesofUSB45.Buses&SpeedComparison56.USBDeviceFramework–SoftwareviewofHardware57.Ph

2、ysicalInterfaceofUSB58.USBFullSpeedmainfeatures69.PinDescriptions610.ElectricalCharacteristics711.USBBlocks812.SystemandPowerreset913.USBreset914.Structureandusageofpackagebuffers915.Endpointinitialization1016.Double-bufferedendpoint1117.Isochronoustransfers1118.Suspend/Resumeevents1219.Registe

3、rDescriptions1220.Conclusion28USB1.BriefHistoryofUSBUSBwasco-developedbyagroupofcompanies(Microsoft,Intel,Compaq,NEC),whowanttomakeitmucheasiertoadd/removeperipheraldevicesfromPCs.First,itwasdevelopedin1998withthenamewithUSB1.1andlaterat2000itcanupdateintoUSB2.0.EmergingofUSBmakestheotherports(

4、suchasserial,parallel,PS/2)intomoreinefficientanduncomfortablethingsduringlastdecade.2.PhysicalbustopologyPhysicalbustopologyofUSBdevices3.LogicalbustopologylNotatiredstarlSoftwareofthehostdevicethatgivecommunicationstoeachoflogicaldevicelikeaconnectionbetweenroothubandhissubordinate.Physicalbu

5、stopologyofUSBdevices4.SomeFeaturesofUniversalSerialBusUSBisSingleMaster&MultipleSlavespolledbus.ExtendthefunctionalityofyourcomputerwithDataAnalysis,DataLogging,FirmwareUpdates,Diagnostic,andEmbeddedApplications.lAutoDetection&Configuration(Plug&Play)lEasyexpansionusinghubslBuspowerlDataCRCpro

6、tected,badpacketsresentlThreespeeds:(Low1.5Megabits/S;Full12Megabits/S;High480Megabits/S)5.Buses&SpeedComparison6.USBDeviceFramework–SoftwareViewofHardware7.PhysicalInterfaceofUSBlHalfDuplexwithNRZIDataEncodinglBusPowertoeachdevice:n4.40-5.25VnGuaranteed100mAn500mAmaximumthroughnegotiationnMust

7、useexternalpowerifmoreisrequired.8.STR750USBFullSpeedTheSTR750embedsaUSBdeviceperipheralcompatiblewiththeUSBFullspeed12Megabits/S.limplementsafullspeed12Mbsfunctioninterfaceslhassoftwareconfigurableendpointsetting&suspend/resumesu