The invention resides in a computer-aided design system for defining physical placement and floor-planning of electronic circuits on a given substrate. Improve utilization of substrate area is achieved by arranging circuits into structural (e.g., data-path) and non-structural (e.g., non-data-path) zones...http://www.google.de/patents/US5930499?utm_source=gb-gplus-sharePatent US5930499 - Method for mixed placement of structured and non-structured circuit elements
