An integrated CAD-system supporting hierarchical design of n-MOS VLSI circuits

A CAD system is presented which includes both simulation and layout programs sharing a common data base and supporting different hierarchical design styles of MOSVLSI circuits. The front end is a cell design system with graphical stick-diagram input which is compacted into real layout based on a set of lay-out rules. Circuit and logic description is extracted for mixed mode simulation. Cells are symbolically combined or automatically placed and routed as standard cells, arbitrary blocks or a mixture of them. Hierarchical design management is insured by a file management system. The system runs on a VAX 11-780, Tektronix 4014 and is written in FORTRAN.