FRstress The Stress Module for FlexRay > Trigger logic to detect different positions in the FlexRay frame (including Header, Payload, etc.) > 4 parallel trigger conditions and associated disturbance sequences > Configuration via FIBEX databases > Trigger output to drive external devices such as an oscilloscope or signal generator > Synchronization capability for parallel operation of two FRstress modules to disturb both FlexRay channels For testing and validating FlexRay systems there is a need for greater precision in studying a system’s behavior in response to errors and disturbances. FRstress generates reproducible disturb-ances on a channel in the FlexRay cluster. It can generate proto-col errors as well as disturbances in bus physics that are activated by trigger conditions. This gives the developer and tester a high-performance stress module. Functions and Advantages FRstress is an easy-to-use hardware module whose integration in the system differs depending on the desired disturbance. For asynchronous disturbances and physical modifications of the bus line FRstress is connected as an additional network node. For bit-precise Application Areas FRstress is the ideal tool for testing disturbance handling in Flex- Ray systems and nodes. It enables reproducible simulation of line problems. The following tasks can be implemented: > Synchronous manipulation of bit fields of FlexRay frames (including Sync flag, FrameId, payload, frame trailer) with immediate CRC recalculation > Disturbance of specific ECUs > Simulation of slowly evolving failures > Simulation of additional line lengths > Tolerance analyses by delayed transmission between one node and the rest of the network. disturbances, on the other hand, FRstress is introduced directly into the bus line. A third mode just activates the trigger logic with high-impedance termination to drive external devices. Functions FRstress offers numerous functions such as: > Generation of asynchronous and synchronous disturbance sequences > Modification of individual frame bits including CRC recalcula-tion 4/16 (e.g. Sync flag) Mode of Operation A trigger condition is assigned to each disturbance sequence. In its quiescent state FRstress observes the FlexRay bus. As soon as a trigger condition is detected, the associated disturbance sequen- > Switch-in RC network with adjustable resistances and an adjustable capacitor > Switchable connections between the bus lines, to ground and to supply voltage