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M. S. Ramaiah School of Advanced Studies 1 M. Sc. (Engg.) in Electronics System Design Engineering GREESHMA S CWB0913004 , FT-2013 8thModule Presentation Module code : ESE2512 Module name : Data Communication and Networks Module leader: Ms. Nireeksha Presentation on : 14/07/2014 FlexRay
M. S. Ramaiah School of Advanced Studies 2 •INTRODUCTION •FLEXRAYARCHITECTURE •FLEXRAYFRAMEFORMAT •COMPARISON:OVERVIEW •FLEXRAY:ACCESSSCHEME •FLEXRAYV2.1ANDV3.0 •FLEXRAYV3.0:TT-E •FLEXRAY:WAKEUP •FLEXRAY:APPLICATIONS •FLEXRAY:ROADMAP •CONCLUSION Overview •REFERENCES
M. S. Ramaiah School of Advanced Studies 3 Introduction ►FlexRayisanautomotivenetworkcommunicationsprotocoldevelopedbytheFlexRayConsortiumtogovernon-boardautomotivecomputing ►ItisdesignedtobefasterandmorereliablethanCANandTTP, butitisalsomoreexpensive ►VisualSimFlexRaylibraryenablesasystemdesignertoconstructmodelsofcomplexstandardandnon-standardFlexRaytopologies
M. S. Ramaiah School of Advanced Studies 4 Figure 1: Layered structure of FlexRay communication node ►ThePhysicallayerdefineshowsignalsareactuallyTransmitted ►Thetransferlayerisresponsiblefortiming, synchronization,messageframing,errordetectionandsignaling,andfaultconfinement ►ThepresentationLayerisconcernedwithframefilteringandmasking,framestatushandlingandcontainsthecommunicationcontrollerhostinterface ►TheApplicationLayerisauser-programmedapplicationforexpectedoperations Layered Architecture of the FlexRay
M. S. Ramaiah School of Advanced Studies 5FlexRay: Architecture of Node Figure 2 : FlexRay architecture ►MCU:Microcontroller ►CC:FlexRayCommunicationController:•embedded(e)•standalone(s) ►BD:FlexRayBusDriver ►AS:FlexRayActiveStar ►Cabling:twistedpairunshielded ►Twochannels ►Topology:busorstar
M. S. Ramaiah School of Advanced Studies 6 ►FrameIDisaidentifier,whichis12bits,anddefinestheslotpositioninthestaticsegmentandthepriorityinthedynamicsegment ►H-CRC is a Cyclic Redundancy Check, which is 9 bits, and is calculated over the SYNC and DLC field ►NFisaNullFramefield,whichis1bit,andindicateswhetherthecorrespondingdatabufferisnotupdatedbythehostbeforesending ►CYCOisaCycleCounter,whichis6bits,andisincreasedsimultaneouslyinallnodesbythecontrolleratthestartofeachnewcommunicationcycle Figure 3 : FlexRay frame format FlexRay frame format
M. S. Ramaiah School of Advanced Studies 7 Comparison: Overview Table 1 : Comparison
M. S. Ramaiah School of Advanced Studies 8 FlexRay : Access Scheme ►StaticSegment:Slotswithfixedlength.Fixedassignmentbetweenslotsandnodes Timedivisionmultipleaccess:TDMA ►DynamicSegment:Minislotswithfixedlength.Minislotscanbecombinedtocontainframeswithvariablelength.Nofixedassignedbetweenslotsandnodes ►Max.payloadperframe(staticanddynamicsegment):254bytes ►SymbolWindow:Usedforwake-upsymbols ►NetworkIdleTime(NIT):Clockcorrection Figure 4 : FlexRay Access Scheme and flexray communication cycle example
M. S. Ramaiah School of Advanced Studies 9 ►Coldstart/sync node: Dedicated node for startup of the FlexRay cluster + providing sync frames ►FlexRay V2.1: At least two coldstart nodes are required ►FlexRay V3.0: Single special coldstart node is allowed (TT-L node) FlexRay V2.1 and V3.0 Figure 5 : FlexRay V2.1 and V3.0 Versions
M. S. Ramaiah School of Advanced Studies 10FlexRay V3.0: TT-E ►SinglegatewaynodeconnectsbothFlexRayclusters ►Gatewaynode:timegatewaysourcenode+timegatewaysinknode ►Timegatewayinterface:Clocksynchronization ►Timegatewaysinknode:TT-Lnode,i.e.,singlenodewhichdrivessynchronizationinsinkcluster Figure 6 : FlexRay V3.0
M. S. Ramaiah School of Advanced Studies 11 FlexRay V3.0: TT-E ►Same cycle length in both clusters ►Fixed cycle offset between clusters ►Clusters can have different schedules Figure 7 : FlexRay V3.0
M. S. Ramaiah School of Advanced Studies 12 FlexRay V3.0: Wake-up ►FlexRay V2.1: Wake-up before startup/communication only ►FlexRay V3.0: Wake-up also during operation possible: WUDOP Figure 8 : FlexRay V3.0 : Wake-up
M. S. Ramaiah School of Advanced Studies 13FlexRay : Applications
M. S. Ramaiah School of Advanced Studies 14 FlexRay : Roadmap Figure 9 : FlexRay Roadmap
M. S. Ramaiah School of Advanced Studies 15Conclusion ►FlexRay: •Built-in time triggered: deterministic communication •V3.0: downward compatible + interesting new features •Best for medium data rates (~10 Mbit/s) ►CAN: •Event triggered, not deterministic•Best for low data rates (~1 Mbit/s) •Extensions available
M. S. Ramaiah School of Advanced Studies 16 Reference 1.Paret, D. (2012)Flexray And Its Applications. 1st edn. Hoboken, NJ: Wiley 2.Anon. (2010) available from <http://Flexray> [13 July 2014]
M. S. Ramaiah School of Advanced Studies 17 Thank You

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FlexRay

  • 1. M. S. Ramaiah School of Advanced Studies 1 M. Sc. (Engg.) in Electronics System Design Engineering GREESHMA S CWB0913004 , FT-2013 8thModule Presentation Module code : ESE2512 Module name : Data Communication and Networks Module leader: Ms. Nireeksha Presentation on : 14/07/2014 FlexRay
  • 2. M. S. Ramaiah School of Advanced Studies 2 •INTRODUCTION •FLEXRAYARCHITECTURE •FLEXRAYFRAMEFORMAT •COMPARISON:OVERVIEW •FLEXRAY:ACCESSSCHEME •FLEXRAYV2.1ANDV3.0 •FLEXRAYV3.0:TT-E •FLEXRAY:WAKEUP •FLEXRAY:APPLICATIONS •FLEXRAY:ROADMAP •CONCLUSION Overview •REFERENCES
  • 3. M. S. Ramaiah School of Advanced Studies 3 Introduction ►FlexRayisanautomotivenetworkcommunicationsprotocoldevelopedbytheFlexRayConsortiumtogovernon-boardautomotivecomputing ►ItisdesignedtobefasterandmorereliablethanCANandTTP, butitisalsomoreexpensive ►VisualSimFlexRaylibraryenablesasystemdesignertoconstructmodelsofcomplexstandardandnon-standardFlexRaytopologies
  • 4. M. S. Ramaiah School of Advanced Studies 4 Figure 1: Layered structure of FlexRay communication node ►ThePhysicallayerdefineshowsignalsareactuallyTransmitted ►Thetransferlayerisresponsiblefortiming, synchronization,messageframing,errordetectionandsignaling,andfaultconfinement ►ThepresentationLayerisconcernedwithframefilteringandmasking,framestatushandlingandcontainsthecommunicationcontrollerhostinterface ►TheApplicationLayerisauser-programmedapplicationforexpectedoperations Layered Architecture of the FlexRay
  • 5. M. S. Ramaiah School of Advanced Studies 5FlexRay: Architecture of Node Figure 2 : FlexRay architecture ►MCU:Microcontroller ►CC:FlexRayCommunicationController:•embedded(e)•standalone(s) ►BD:FlexRayBusDriver ►AS:FlexRayActiveStar ►Cabling:twistedpairunshielded ►Twochannels ►Topology:busorstar
  • 6. M. S. Ramaiah School of Advanced Studies 6 ►FrameIDisaidentifier,whichis12bits,anddefinestheslotpositioninthestaticsegmentandthepriorityinthedynamicsegment ►H-CRC is a Cyclic Redundancy Check, which is 9 bits, and is calculated over the SYNC and DLC field ►NFisaNullFramefield,whichis1bit,andindicateswhetherthecorrespondingdatabufferisnotupdatedbythehostbeforesending ►CYCOisaCycleCounter,whichis6bits,andisincreasedsimultaneouslyinallnodesbythecontrolleratthestartofeachnewcommunicationcycle Figure 3 : FlexRay frame format FlexRay frame format
  • 7. M. S. Ramaiah School of Advanced Studies 7 Comparison: Overview Table 1 : Comparison
  • 8. M. S. Ramaiah School of Advanced Studies 8 FlexRay : Access Scheme ►StaticSegment:Slotswithfixedlength.Fixedassignmentbetweenslotsandnodes Timedivisionmultipleaccess:TDMA ►DynamicSegment:Minislotswithfixedlength.Minislotscanbecombinedtocontainframeswithvariablelength.Nofixedassignedbetweenslotsandnodes ►Max.payloadperframe(staticanddynamicsegment):254bytes ►SymbolWindow:Usedforwake-upsymbols ►NetworkIdleTime(NIT):Clockcorrection Figure 4 : FlexRay Access Scheme and flexray communication cycle example
  • 9. M. S. Ramaiah School of Advanced Studies 9 ►Coldstart/sync node: Dedicated node for startup of the FlexRay cluster + providing sync frames ►FlexRay V2.1: At least two coldstart nodes are required ►FlexRay V3.0: Single special coldstart node is allowed (TT-L node) FlexRay V2.1 and V3.0 Figure 5 : FlexRay V2.1 and V3.0 Versions
  • 10. M. S. Ramaiah School of Advanced Studies 10FlexRay V3.0: TT-E ►SinglegatewaynodeconnectsbothFlexRayclusters ►Gatewaynode:timegatewaysourcenode+timegatewaysinknode ►Timegatewayinterface:Clocksynchronization ►Timegatewaysinknode:TT-Lnode,i.e.,singlenodewhichdrivessynchronizationinsinkcluster Figure 6 : FlexRay V3.0
  • 11. M. S. Ramaiah School of Advanced Studies 11 FlexRay V3.0: TT-E ►Same cycle length in both clusters ►Fixed cycle offset between clusters ►Clusters can have different schedules Figure 7 : FlexRay V3.0
  • 12. M. S. Ramaiah School of Advanced Studies 12 FlexRay V3.0: Wake-up ►FlexRay V2.1: Wake-up before startup/communication only ►FlexRay V3.0: Wake-up also during operation possible: WUDOP Figure 8 : FlexRay V3.0 : Wake-up
  • 13. M. S. Ramaiah School of Advanced Studies 13FlexRay : Applications
  • 14. M. S. Ramaiah School of Advanced Studies 14 FlexRay : Roadmap Figure 9 : FlexRay Roadmap
  • 15. M. S. Ramaiah School of Advanced Studies 15Conclusion ►FlexRay: •Built-in time triggered: deterministic communication •V3.0: downward compatible + interesting new features •Best for medium data rates (~10 Mbit/s) ►CAN: •Event triggered, not deterministic•Best for low data rates (~1 Mbit/s) •Extensions available
  • 16. M. S. Ramaiah School of Advanced Studies 16 Reference 1.Paret, D. (2012)Flexray And Its Applications. 1st edn. Hoboken, NJ: Wiley 2.Anon. (2010) available from <http://Flexray> [13 July 2014]
  • 17. M. S. Ramaiah School of Advanced Studies 17 Thank You