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In the paper a CAD system, Orion, for the automated control-flow based synthesis of synchronous digital circuits will be presented. Orion's goal is to speed up the design process by at least one order of magnitude, relieving the designer from uncreative and error-prone phases. Orion's input is a behavioral description of the circuit, written in a nonprocedural hardware description language (HDL), whereas its output is a structural description, compatible with tools for automatic layout, e.g. those available for PLAs and standard cells. After a detailed analysis of Orion architecture, comparisons will be made with related researches.