An efficient heuristic algorithm for fast clock mesh realization

Abstract

The application of multiple clocking domains with dedicated clock buffer will be implemented. In this paper, an algorithm is proposed for determining the minimum number of clock domains to be used for multi domain clock skew scheduling. Non-tree based distributions provide a high tolerance towards process variations. The clock mesh constraints can be overcome by two processes. First a simultaneous buffer placement and sizing is done which satisfies the signal slew constraints while minimizing the total buffer size by heuristic algorithm. The second one reduces the mesh by deleting certain edges, thereby trading off skew tolerance for low power dissipation by post processing techniques. Finally comparisons of wire length, power dissipation, nominal skew and variation skews using H-SPICE software for various sized benchmark circuits are performed.