Industrial Application of High Level Design Tools in Large Computer System Development

This paper describes the current design methodologies in use at BULL S.A. for the development of high-range, general-purpose computers. These systems are characterized by a very complex architecture, implemented in VLSI circuits using up-to-date CMOS technologies. To meet the time to market constraints, well defined methodologies have to be applied, guarantying a one pass zero defect design at both the functional and performance levels. Since more than 10 years, advanced design tools have been developed in the Company, to deal with the underlying design challenges. More precisely this paper presents the most innovative parts of the current methodologies, as they have been or are used by the designers. A specific emphasis is put on high level description and verification methods and tools, usable for system complexities of several millions of gates. Finally the paper contains also some prospective views on the future of high-level design tools, as they can be viewed from a mainframe manufacturer point of view.