Embedding a FPGA circular array into MIMD architectures allows one to synthesize fine-grain circuits for global computation support. These circuits operate concurrently with the distributed applications. They provide specific speed-up or additional services, such as communication protocols or global controllers. This article describes an architectural model for such controllers with practical examples implemented on the ArMen FPGA-multiprocessor. A multi-assignment language derived from the UNITY formalism is proposed, to implement the controllers with a high degree of parallelism. Their hardware synthesis principles are given.
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