Pseudo-3D Approaches for Commercial-Grade RTL-to-GDS Tool Flow Targeting Monolithic 3D ICs

Abstract

Despite the recent academic efforts to develop Electronic Design Automation (EDA) algorithms for 3D ICs, the current market does not have commercial 3D computer-aided design (CAD) tools. Insteadpseudo-3D alternative design flows have been devised which utilize commercial 2D CAD engines with tricks that help them operate as a fairly-efficient 3D CAD tool. In this paper we provide detailed discussions and fair power-performance-area (PPA) comparisons of state-of-the-art pseudo-3D design flows. We also analyze the limitations of each design flow and provide solutions with better PPA and various design options. Our experiments using commercial PDK, GDS layouts, and sign-off simulations demonstrate that we achieve up to 26% wirelength and 10% power consumption reduction for pseudo-3D design flows. We also provide a partitioning-first scheme to partitioning-last design flow which increases design freedom with tolerable PPA degradation.