Principles of design automatioon system for very large scale computer design

The paper describes the outline of the design automation system which provides the following design methods: --Higher level structural drawings capable of expressing designs with boolean equations and truth tables. --Function level logic simulation of the entire computer design with extensive use of function test programs. --Automated logic synthesis generating detailed logic just as designers expect. --Delay check promising the most truthful timing evaluation at each design stage in progress. --Highly automated physical design and diagnosis data generation. The latest very large scale general purpose computer HITACHI M-680H/682H utilizes these methods to successfully reduce its development time.