1. Introduction
System design is one of the key steps in the design flow of real time signal processing heterogeneous embedded systems [1]. Starting with a functional specification of a target application, it is of prime importance to determine as soon as possible a precise system architecture specification. This system specification must be able to support successive and concurrent design refinements leading to an actual real time system with reduced area and energy consumption. Approaches based on cosimulation (e.g., systems like Polis [2], VCC from Cadence) impose a preliminary manual hardware/software partitioning and a development of precise simulation models. Cosimulation techniques permit the validation of system specification after partitioning.