Real time embedded system design needs collaboration between architectures model, platforms and application specification in order to prototype a real time system from high level specification. In many case, one solution of prototype is not so good to answer the environment changes around embedded system. For this reason, when we want to run an application on embedded system, we need to have several prototypes with different performance levels in order to address the environment evolution. This paper gives an approach for rapid embedded system prototyping using a general architectural mode named PACM and existing prototyping platforms. Several prototypes are proposed to get a first space solution, thus the exploration process is accelerated and an efficient solution can be selected.