Validation formelle des systèmes numériques critiques : génération de l'espace d'états de réseaux de Petri exécutés en synchrone

Abstract : The HILECOP methodology has been developed for the formal design of critical complex digital systems; it therefore covers the entire design process, ranging from modeling to code generation for implementation on the hardware target (FPGA type electronic component), via formal validation. However, if the formal model, the Petri nets in this case, is inherently asynchronous, it is nevertheless executed synchronously on the target. In fact, the usual analysis approaches are not adapted in the sense that they construct state graphs that do not conform to the real state evolution within the target. In order to gain confidence in the validity of the results of the formal analysis, this work aims to capture the so-called non-functional characteristics, to reify them on the model and finally to consider their impact through the analysis.In other words, the aim is to improve the expressiveness of the model and the relevance of the analysis, considering aspects such as clock synchronization, effective parallelism, the risk of blocking induced by the expression of an event (condition) and a time window of occurrence, without omitting the management of exceptions.To deal with all these aspects, we have proposed a new method of analysis for extended generalized synchronous executed time Petri nets, transforming them into an analysable equivalent formalism. This formalism is associated with a formal semantics integrating all the particular aspects of the execution and dédicated state space construction algorithm: the Synchronous Behavior Graph.Our work has been applied to an industrial case, more precisely to the validation of the behavior of the digital part of a neuro-stimulator.
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Ibrahim Merzoug. Validation formelle des systèmes numériques critiques : génération de l'espace d'états de réseaux de Petri exécutés en synchrone. Systèmes embarqués. Université Montpellier, 2018. Français. ⟨NNT : 2018MONTS001⟩. ⟨tel-01704776⟩

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