Timing closure based on physical hierarchy

In this paper, we shall present the progress and results of the ongoing project at UCLA on synthesis and optimization under physical hierarchy. First, we shall motivate our approach by pointing out the limitations of the existing approach to interconnect planning based on early RTL floorplanning following logic hierarchy. Then, we shall discuss the technical challenges for synthesis under the physical hierarchy, including handling high computational complexity from the flattened logic hierarchy, needs of retiming and pipelining over global interconnects, and extension of existing synthesis operations. Finally, we shall outline our approaches to overcome these technical challenges