FlexRay Protocol Specification. Version Revision A. December Disclaimer. Page 2 of Disclaimer. This specification as released by the. This paper deals with modelling & analysis of flexray protocol on FPGA. FPGA . [5] FlexRay Communications System – Protocol Specification, v Revision A. In this paper, we first design the FlexRay communication controller, bus guardian protocol specification and function parts using SDL (specification and.


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ERay | Bosch Semiconductors & Sensors

It uses a standardised FlexRay communication bus and introduces a go-back-N style retransmission algorithm. A formal modelling language, Coloured Petri nets CPNhas been applied to verify the protocol design. Separate CPN models of the FrTp service and protocol are developed and with state space analysis-used to prove for selected configurations that FrTp is deadlock-free and conforms to the service specification when transferring a single-protocol data unit from sender to receiver.

In addition, closed-form solutions relating the state space size, retransmission limit, and number of segments are found, giving increased confidence that FrTp is error-free, even for configurations where the state explosion problem arises.

Introduction Vehicles today may contain nearly embedded computers, or Electronic Control Units ECUsthat together control the engine, airbags, suspension, seats, as well as provide information to other on-board devices and users e.

The increasing number and complexity of applications using ECUs has contributed to the development of new in-vehicle communication systems, as well as techniques to simplify the development of applications utilising multiple ECUs.

As future in-vehicle and ITS applications will depend on FrTp for reliable communication, it is important that the design is proved to be free flexray protocol specification significant flexray protocol specification.

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Any unexpected behaviour in vehicle communication systems may lead to expensive bug fixes, recalls, or even fatalities.

Formal methods are well suited for the specification and analysis of such safety-critical systems.

Coloured Petri nets CPNs [ 6 ] are a formal modelling language with a graphical notation to ease model development, backed by a mathematical definition that supports automatic proof of properties using state space exploration.

Key contributions flexray protocol specification the following. In this paper the CPN model is used for formal analysis of the protocol.


However, in future work the CPN model could also be used in other protocol development tasks. For example, with minor modifications to the CPN model, performance analysis of FrTp could be performed or source code could flexray protocol specification generated. Verification of FrTp for these configurations provides confidence that the protocol specification does not contain functional errors.

flexray protocol specification

Verification of the FlexRay Transport Protocol for AUTOSAR In-Vehicle Communications

The observed trends in the state space size provide increased confidence flexray protocol specification the desired properties hold for configurations not yet analysed, thereby avoiding limitations of state space analysis. This paper also includes additional analysis results, in particular verifying the protocol operation for a larger set of configurations and showing the relationship between state space size and protocol parameters.

This paper is structured as follows. Section 3 provides details of the Flexray protocol specification Transport Protocol features. Section 4 introduces CPNs.

FlexRay - Wikipedia

Section 5 presents our CPN model of the service and protocol. Analysis flexray protocol specification proving the correctness of the protocol, as well as other insights, are given in Section 6followed by concluding remarks in Section 7. Background and Related Work 2.


AUTOSAR and FlexRay Future in-vehicle software applications will be implemented as multiple components coordinating with each other to achieve the desired software functionality.

Components may be running on flexray protocol specification ECUs, interact with flexray protocol specification sensors and actuators, and communicate via one or more buses.

AUTOSAR [ 3 ] is an architecture that aims to simplify the development of component-based software applications by hiding the complexities of the ECU's and communication bus from components.


As an example, consider Figure 1 which shows an application comprised of four components distributed across three ECUs. Below the RTE are a set of AUTOSAR services, and corresponding hardware abstractions and drivers, that flexray protocol specification be commonly used by multiple software applications, thereby avoiding the need to be implemented in each component.