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In the definition of automotive multiplex system architectures, several problems arise due to a lack of preciseness in the specification of customer defined functional requirements and devices characteristics. To cope with this problems, we propose to define a systematic flow of the design process and a structured organization of the information, that gives the system designers guidelines on how to make implementative and technological decisions about the architecture of a multiplex system. The purpose of this paper is to present a structured graph-based design procedure, that helps the system designers in the partitioning and modelling of the system, allowing them to define architectures more easily and helping them to estimate performance and costs of the system.

In the last few years a large number of Top-Down approaches that allow system designers to partition multiplex systems have been proposed. Using these methods different structures of the system can be obtained so that automotive system designers need only to evaluate the limits of the system and which architectural solution satisfies the functional requirements. This performance evaluation can be achieved by means of system simulation and, to do this, it is mandatory to raise the abstraction level of the system description in order to model and verify complex systems more easily. In this paper we present the use of VHDL (Vhsic Hardware Description Language) for high-level description and simulation of multiplex systems.