A technology mapping system, used for computer design in NEC, is presented. The features of this system are technology conversion and logical/physical optimization, based on a rule base, partitioning support, conversion verification and special layout consideration. This system is practically used for many applications for technology mapping, including redesigning an existing total unit into a new unit, based on up-to-date LSI technology. The resulting effect is quick inputting of integrated circuit technology progress into practical computer design area.

An integrated design system using CAD tools, which was applied to the design of the supercomputer (SX-1, SX-2), is described. The key points for designing the large system are a short design cycle, high productivity, high quality and user-friendly interface to the CAD system. Three strategies have been adopted: engineering work station utilization, thorough verification in an early design stage and establishment of a design flow using CAD tools. By the CAD system based on those strategies, a supercomputer with high quality was successfully designed in a short time.