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Over the last decade many academic and industrial system synthesis and codesign tools have been proposed to designers. However most of these tools are based on IP Libraries but either these libraries are incomplete or are simply not adapted to the targets and constraints. It means that something important is missing when it comes to real implementations. We address this question in this paper and propose a flexible, fast and practical solution. We use high level synthesis (HLS) to obtain fast estimations of hardware accelerators that can then be embedded within the loop of a larger design space exploration flow. Once some solutions are selected they can be directly reuse to synthesise and produce real IPs. In this paper we present the approach and the tool as a key component of our heterogeneous multiprocessor synthesis framework.