Establishment of Higher Level Logic Design for Very Large Scale Computer

A very large scale and complex computer made of a significant number of LSIs exclusively requires the highly reliable design to be developed within a given period of time. The higher level design, which is expressed in a high-level structural logic drawing FL (Function Logic diagram), has established the method of improving extremely designers productivity due to an efficient logic synthesis system. In the development of very large scale computer HITACHI M-680H/682H, the logic synthesis system has generated the technology-specific detailed logics of which 98.7% was acceptable for the designers and proved to be very effective.