A dynamic programming based algorithm for post-scheduling frequency assignment in energy-efficient high-level synthesis

Scaling frequency and voltage in a coordinated manner is a promising way to reduce energy and power. we explore the use of dynamic frequency clocking within the datapath and datapath scheduling algorithms that can be incorporated into a datapath synthesis tool. Given a schedule, we propose a practical optimal frequency assignment algorithm based on dynamic programming. The algorithm run very fast in practice. Though the algorithm theoretically run in a pseudo polynomial time O(n_cT_ex ²), n_c is the number of control steps and T_ex is the difference between the timing constraint and the critical path delay.