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This paper addresses the problem of identifying the minimal pipelining needed in an asynchronous circuit (e.g., number/size of pipeline stages/latches required) to satisfy a given performance constraint, thereby implicitly minimizing area and power for a given performance. In contrast to the somewhat analogous problem of retiming in the synchronous domain, we first show that the basic pipeline optimization problem for asynchronous circuits is NP-complete. This paper then presents an efficient branch and bound algorithm that can find the optimal pipeline configuration for moderately-sized problems. Our experimental results on a few scalable system models demonstrate that our novel branch and bound solver can find the optimal pipeline configuration for models that have up to 2/sup 35/ possible pipeline configurations.
Date of Conference: 5-9 Nov. 2000