Abstract: Tobuildunifiedon-boardcommunicationinfrastructurebasedonSpaceWrie,researchshouldbedonetoguaranteethedeterministicandreal-timeperformanceofmessagetransmission.Toovercomethelackofflexibilityintraditionaltime-triggeredcommunication,amodifiedtime-triggeredSpaceWirenetworkwhichsupportedthebroadcastingofcommunicationtasktransmissionidentifierwasproposed.Onthisbasis,anon-destructivepre-emptiblecommunicationmechanismwasbuiltandtheapplicationofclassicalprocessorreal-timeschedulingalgorithmtocommunicationtaskschedulingwasdiscussed.Atlast,thetransmissiondelayperformancewasanalyzedandcomparedamongevent-triggered,traditionaltime-triggeredandnon-blockingreal-timeSpaceWirecommunicationmechanisms.Theresearchshowsthatthiscommunicationmechanismcanreducetheworst-caseend-to-enddelay,andissuitedfortheschedulingofcommunicationtaskswithvariouspriorities.

Key words: onboardnetwork, SpaceWire, preemptible, realtime, deterministic