The technique of multiple supply voltages and dynamic frequency is explored as a possible lower-power, higher-performance strategy in CMOS circuits. In this paper, we considered this technique in scheduling process which is the key of high level synthesis. We will present a novel method of the frequency assignment when a scheduling is given. The goal is to decrease the energy consumption as much as possible without violating the timing constraints. Initially, an approach based on the Convex Cost Integer Network Flow is used to generate a feasible initial frequency assignment solution. Secondly, a branch and bound based method is used to improve the initial assignment solution. Finally, due to the dynamic frequency solution, we perform the voltage assignment to each function unit in the control step. The experimental results show the effectiveness of the proposed method.
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