Pathfinder 3D: A flow for system-level design space exploration

Three dimensional integration technology has the potential to provide enhanced performance and device density gains beyond that available from technology scaling alone. However, it provides plethora of design choices for system designers. The full exploitation of the benefits of 3D integration requires a system-level exploration flow which can facilitate in finding an optimal 3D design by comparing possible early design choices. In this paper we present a flow for fast system-level exploration useful for path finding studies. The flow enables users to explore the tradeoff between different stacking and partitioning schemes in terms of performance, power, and temperature. We also present a free open source design kit compiler, FreePDK3D45 and a tool for fast floorplan evaluation of TSV-based digital architectures, Pathfinder3D. The open source design kit and architecture evaluator can help the community to research, learn and explore the various aspects of 3D integration. Using the proposed flow and design kit, we present a case study of 3D integration of a Network on Chip. This case study demonstrates system-level comparisons of the performance, power and temperature of different homogenously partitioned stacking schemes.