The verification of an in-vehicle network often requires to look at more than one level of abstraction at a time. The LIN (local interconnect network) bus is a good example for that, especially because being a low-cost solution, the system design and setup requires a lot of careful considerations to guarantee functionality. At the moment, this is not addressed by existing methods, which are dedicated either to physical or application layer, but not both. This paper fills this gap by introducing a methodology to insert the protocol related software execution as well as the motor behavior into the physical layer mixed-signal (i.e. analog/digital) simulation. Electronics and mechanics are covered by the hardware description language VHDL-AMS, while the Software is given in C. It will be shown that the transfer of one message over a larger LIN network in a door with window lifter can be simulated in roughly one CPU minute on a SUN Spare Ultra 80 workstation. Moreover, the network's behaviour is made transparent through using a software debugger illustrating and controlling the software execution on the nodes in question. In contrast to a breadboard solution for the verification, it is also possible to control all parameters of silicon and system, e.g. it is possible to assess fastest as well as slowest silicon in its environment.
In-vehicle network verification from application to physical layer
2004
7 Seiten, 9 Bilder, 10 Quellen
Conference paper
English
In-vehicle network verification from application to physical layer
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