Deterministic data delivery with SpaceWire

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1、SpaceWire-D:DeterministicDataDeliveryWithSpaceWireSPACEWIRE-D:DETERMINISTICDATADELIVERYWITHSPACEWIRESession:SpaceWireStandardisationLongPaperSteveParkes,AlbertFerrer,SpaceTechnologyCentre,SchoolofComputing,UniversityofDundee,Dundee,UKE-mail:sparkes@computing.dundee.ac.ukStuartMills,Ale

2、xMasonSTAR-DundeeLtd,c/oSchoolofComputing,UniversityofDundee,Dundee,UKEmail:stuart@star-dundee.com,alex@star-dundee.comABSTRACTHowcandatabedelivereddeterministicallyoveranexistingSpaceWirenetworkusingexistingSpaceWirecomponentsi.e.withnomodificationtotheSpaceWireinterfaceorrouterhardwa

3、re?Theapproachexploredinthispaperisthesharingofsystembandwidthusingtime-divisionmultiplexing.ThepaperexploresdeterministicdeliveryoverSpaceWirenetworks,describeshowthiscanbeachievedwithcurrentSpaceWirenodesandrouters,providescorrespondingtheoreticalperformanceestimates,andreportsonapra

4、cticaldemonstrationofSpaceWire-D.1INTRODUCTIONSpaceWireprovidesaversatilenetworkarchitecturewhichisidealformanyspaceapplications[1].Ithasbeenwidelyusedforpayloaddata-handlingonmorethan30spacemissions.SpaceWireisidealfordata-handlingapplicationsbutdoesnotaddressavionicsandotherapplicati

5、onswhereresponsiveness,robustness,determinismanddurabilityareessentialrequirements.ThereisaneedforaspacecraftavionicsnetworktechnologywhichcombinesthekeyfeaturesofSpaceWirewiththequalityofservicerequirementsofreal-timeavionicsapplications.Onecriticalrequirementforavionicsapplicationsis

6、deterministicdeliveryofinformation.2THEPROBLEMWITHDETERMINISTICDATADELIVERYOVERSPACEWIREDeterministicdatadeliveryisthedeliveryofdatawithinpredeterminedtime-constraints:nottooearlyandnottoolate.Theessentialconsiderationisaprioriknowledgeofwhendatawillbedeliveredandthelevelofuncertaintyi

7、nthatknowledge.SpaceWire-D(whereDstandsfordeterminism)isaprotocolthatprovidesdeterministicdeliveryoveraSpaceWirenetwork[2].SpaceWire-Ddeliversdatawithinpredeterminedtimeconstraints.SpaceWireisanasynchronousnetworkwhichuseswormholerouting.Theleadingbyte(s)onaSpaceWirepacketdeterminest