Controller Area Network Physical Layer Requirements
ApplicationReportSLLA270 (CAN),ISO11898:1993,isfindingwidespreadu seinbuildingautomation,processcontrol, , (bittimingrequirements)................. ................. ( )....................................... ............ LayerData-LinkLayerLogic Link ControlMedium Access ControlPhysicalLayerPhysical SignalingPhysical Medium AttachmentMedium Dependant InterfaceEmbeddedCANControllerCANTransce iverCAN BusLine Electricalspecifications:transceivers,co nnectors, cable CANcontroller,embedded shighreliability, ,hardwareinterfacecards, :1993StandardArchitectureFigure1displays theISO11898standardarchitectureusingtheb ottomtwolayersoftheOSImodel, ,andaftersendingamessage, , sand0 sintoelectricalpulsesleavinganode, , , 1CANNODE 2CANNODE 3RECEIVE-ONLYNODE Bytes DataCCRRCCACKEOFEOFEOFFISIIDDEErr00DDLLC C11- bitI dentifierRTRSOF11- bitI dentifi erRTRIDEr 0D L C0 ...8C R CA C Kr 118-bitI dentifierSRRSOFBytes , ,onlythosenodesrequiringupdateddataallow themessagetopassthroughafilterthatissetb ythenetworkdesigner ,messagesfromcertainnodescanpass, ,muchofanode's ,thatasystemdesignercanusetoidentifythec ontentofamessage, , , :29-BitIdentifierCAN' , , C wins arbitrationACK bitACK bitACK bitNODEANODEBNODECCANBus4PhysicalLayerRe quirementsPhysicalLayerRequirementsAllno desonabusparticipateineachbit , , ,NodesBandCthenbeginarbitration ' , , ,whicharenormallytransparenttoasystemope rator,a
Application Report SLLA270–January 2008 Controller Area Network Physical Layer Requirements Steve Corrigan.....
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