tailieunhanh - Advanced Hierarchical Event-Stream Model

Analyzing future distributed real-time systems, automotive and avionic systems, is requiring compositional hard real-time analysis techniques. Well known established techniques as SymTA/S and the real-time calculus are candidates solving the mentioned problem. However both techniques use quite simple event models. SymTA/S is based on discrete events the real-time calculus on continuous functions. Such simple models has been choosen because of the computational complexity of the considered mathematical operations required for real-time analysis. Advances in approximation techniques are allowing the consideration of more expressive descriptions of events. In this paper such a new expressive event model and its analysis algorithm are described. It integrates the models of both techniques. It is also possible in. | Euromicro Conference on Real-Time Systems Advanced Hierarchical Event-Stream Model Karsten Albers Frank Bodmann and Frank Slomka Embedded Systems Real-Time Systems Ulm University namesurname @ Afotract Analyzing future distributed real-time systems automotive and avionic systems is requiring compositional hard real-time analysis techniques. Well known established techniques as SymTA S and the real-time calculus are candidates solving the mentioned problem. However both techniques use quite simple event models. SymTA S is based on discrete events the real-time calculus on continuous functions. Such simple models has been choosen because of the computational complexity of the considered mathematical operations required for real-time analysis. Advances in approximation techniques are allowing the consideration of more expressive descriptions of events. In this paper such a new expressive event model and its analysis algorithm are described. It integrates the models of both techniques. It is also possible in this module to integrate an approximative real-time analysis into the event model. This allows to propagate the approximation through the analysis of a distributed system leading to a much more efficient analysis. 1. Motivation The module-based design processes make it possible to handle the complexity in software and hardware design. Systems are build using a set of closed modules. These modules can be designed and developed separately. Modules have only designated interfaces and connections to other modules of their set. The purpose of modularisation is to split the challenging job of designing the whole system into multiple smaller jobs allowing the reuse of modules in different designs or to include iP components of third-party vendors. Every module-based design concept requires a well defined interface-concept for connecting the modules. Developing realtime systems requires for this interface-concept to cover also the real-time aspects of the .

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