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We formulate the synthesis problem of complex behavioral descriptions with performance constraints as a hardware-software co-design problem. The target system architecture consists of a software component as a program running on a re-programmable processor assisted by application-specific hardware components. System synthesis is performed by first partitioning the input system description into hardware and software portions and then by implementing each of them separately. The synthesis of dedicated hardware is then achieved by means of hardware synthesis tools [1], while the software component is generated using software compiling techniques. We consider the problem of identifying potential hardware and software components of a system described in a high-level modeling language and we present a partitioning procedure. We then describe the results of partitioning a network coprocessor.