SNIP_CLASSIC_SYSTEMTEMPLATE_SECTION_6_4_IPdu_Timing

6.4 IPdu Timing AUTOSAR COM allows configuring statically two different transmission modes for each IPdu (True and False). TransmissionModeDeclaration uses a transmission mode selector, calculated from a number of individual TransmissionModeConditions or ModeDrivenTransmissionModeConditions to decide which of the two modes is selected. It is possible to switch between the transmission modes during runtime. System Template Describable IPduTiming + minimumDelay: TimeValue [0..1] TransmissionModeTiming Identifiable ISignalToIPduMapping + packingByteOrder: ByteOrderEnum [0..1] + startPosition: Integer [0..1] + transferProperty: TransferPropertyEnum [0..1] + updateIndicationBitPosition: Integer [0..1] DataFilter + dataFilterType: DataFilterTypeEnum + mask: UnlimitedInteger [0..1] + max: UnlimitedInteger [0..1] + min: UnlimitedInteger [0..1] + offset: PositiveInteger [0..1] + period: PositiveInteger [0..1] + x: UnlimitedInteger [0..1] TransmissionModeCondition Describable EventControlledTiming + numberOfRepetitions: Integer Describable CyclicTiming TransmissionModeDeclaration FibexElement ISignal + dataTypePolicy: DataTypePolicyEnum + iSignalType: ISignalTypeEnum [0..1] + length: Integer IPdu ISignalIPdu + unusedBitPattern: Integer ARElement AtpBlueprint AtpBlueprintable AtpType ModeDeclarationGroup + onTransitionValue: PositiveInteger [0..1] AtpStructureElement Identifiable ModeDeclaration + value: PositiveInteger [0..1] ModeDrivenTransmissionModeCondition +modeDeclaration 1..*«atpVariation» +eventControlledTiming 0..1 +cyclicTiming 0..1 +iSignalInIPdu 1 +iPduTimingSpecification 0..1 «atpVariation» +modeDrivenTrueCondition 0..* +dataFilter 1 +initialMode 1 +transmissionModeTrueTiming 0..1 +modeDeclaration 1..* +iSignalToPduMapping 0..* «atpVariation» +iSignal 0..1 +transmissionModeFalseTiming 0..1 +transmissionModeCondition 0..* +modeDrivenFalseCondition 0..* +transmissionModeDeclaration 0..1 Figure 6.20: IPdu Timing [TPS_SYST_01075] Signal content evaluation via TransmissionModeCondition ⌈The signal content can be evaluated as the transmission mode selector via the TransmissionModeConditions.⌋(RS_SYST_00037) [TPS_SYST_01076] Mode evaluation via modeDrivenTrueCondition or modeDrivenFalseCondition ⌈Mode conditions can be evaluated as the transmission mode selector via the modeDrivenTrueConditions or modeDrivenFalseConditions.⌋(RS_SYST_00037) [constr_3045] Signal content evaluation vs. Mode evaluation ⌈The mode evaluation and the signal content evaluation shall not be used in the same IPdu. A mix of these two types is not allowed.⌋() To use the signal content evaluation a TransmissionModeCondition can be attached to each signal within an IPdu. Each TransmissionModeCondition contains a reference to a signal and to an assigned filter. The filter condition is used for System Template the selection of the transmission mode. If at least one condition in the signal content evaluation is true, Transmission Mode "TRUE" shall be used for this IPdu. In all other cases, the Transmission Mode "FALSE" shall be used. More details can be found in the COM Specification [21]. [constr_3046] Consistency of TransmissionModeCondition.iSignalInIPdu ⌈The ISignalToIPduMapping referenced by the TransmissionModeCondition in the role iSignalInIPdu shall belong to the same ISignalIPdu as the TransmissionModeCondition.⌋() In the mode driven evaluation ModeDeclarations are evaluated. The transmissionModeFalseTiming is activated if all defined modeDrivenFalseConditions evaluate to true and the transmissionModeTrueTiming is activated if all defined modeDrivenTrueConditions evaluate to true. Each condition that is defined by ModeDrivenTransmissionModeCondition evaluates to true if one of the referenced ModeDeclarations is active. The TransmissionModeDeclaration element aggregates the TransmissionModeTiming in two different roles: transmissionModeTrueTiming and transmissionModeFalseTiming. The available COM Transmission Mode Timings can be described by the CyclicTiming and EventControlledTiming elements (see Table 6.66) that are aggregated by the TransmissionModeTiming class. [TPS_SYST_01077] Mapping of Com Transmission Modes to System Template elements ⌈The mapping of COM Transmission Modes to System Template elements is described in Table 6.66.⌋(RS_SYST_00037) COM Transmission Modes Description realization in System Template Periodic Transmissions occur indefinitely with a fixed period between them CyclicTiming Direct/n-times Event driven transmission with n-1 repetitions EventControlledTiming Mixed Periodic transmission with direct/n-times transmissions in between EventControlledTiming and CyclicTiming None No transmission no timing assigned Table 6.66: COM Transmission Modes Class TransmissionModeDeclaration Package M2::AUTOSARTemplates::SystemTemplate::Fibex::FibexCore::CoreCommunication::Timing ▽ System Template △ Class TransmissionModeDeclaration Note AUTOSAR COM provides the possibility to define two different TRANSMISSION MODES (True and False) for each I-PDU. As TransmissionMode selector the signal content can be evaluated via transmissionModeCondition (implemented directly in the COM module) or mode conditions can be defined with the modeDrivenTrue Condition or modeDrivenFalseCondition (evaluated by BswM and invoking Com_SwitchIpduTxMode COM API). If modeDrivenTrueCondition and modeDrivenFalseCondition are defined they shall never evaluate to true both at the same time. The mixing of Transmission Mode Switch via API and signal value is not allowed. Base ARObject Attribute Type Mult. Kind Note modeDriven FalseCondition ModeDriven TransmissionMode Condition * aggr Defines the trigger for the Com_SwitchIpduTxMode Transmission Mode switch. Only if all defined modeDriven FalseConditions evaluate to true (AND associated) the transmissionModeFalseTiming shall be activated. mode DrivenTrueCondition and modeDrivenFalseCondition shall never evaluate to true both at the same time. modeDriven TrueCondition ModeDriven TransmissionMode Condition * aggr Defines the trigger for the Com_SwitchIpduTxMode Transmission Mode switch. Only if all defined modeDriven TrueConditions evaluate to true (AND associated) the transmissionModeTrueTiming shall be activated. mode DrivenTrueCondition and modeDrivenFalseCondition shall never evaluate to true both at the same time. transmission ModeCondition TransmissionMode Condition * aggr The Transmission Mode Selector evaluates the conditions for a subset of signals and decides which transmission mode should be used. In case only one transmission mode is used there is no need for the "TransmissionMode Condition" and its sub-structure. In case the transmission mode shall be switched using the COM-API "Com_Switch IpduTxMode" there is no need for the "TransmissionMode Condition" and its sub-structure. transmission ModeFalse Timing TransmissionMode Timing 0..1 aggr Timing Specification if the COM Transmission Mode is false. The Transmission Mode Selector is defined to be false, if all Conditions evaluate to false. transmission ModeTrue Timing TransmissionMode Timing 0..1 aggr Timing Specification if the COM Transmission Mode is true. The Transmission Mode Selector is defined to be true, if at least one Condition evaluates to true. Table 6.67: TransmissionModeDeclaration Class TransmissionModeCondition Package M2::AUTOSARTemplates::SystemTemplate::Fibex::FibexCore::CoreCommunication::Timing Note Possibility to attach a condition to each signal within an I-PDU. If at least one condition evaluates to true, TRANSMISSION MODE True shall be used for this I-Pdu. In all other cases, the TRANSMISSION MODE FALSE shall be used. Base ARObject Attribute Type Mult. Kind Note dataFilter DataFilter 1 aggr Possibilities to define conditions iSignalInIPdu ISignalToIPduMapping 1 ref Reference to a signal to which a condition is attached. Table 6.68: TransmissionModeCondition