A device independent, frequency driven layout system and method for field programmable gate arrays ("FPGA") which allow for a circuit designer to specify the desired operating frequencies of clock signals in a given design to the automatic layout system to generate, if possible, a physical FPGA layout...http://www.google.com/patents/US5648913?utm_source=gb-gplus-sharePatent US5648913 - Frequency driven layout system and method for field programmable gate arrays
