US Patent 7676772 Layout description having enhanced fill annotation

Computer readable media hosting a layout description of electric circuitry that includes a description of prospective fill units and includes characteristic data noting at least one characteristic of each fill unit. In one preferred embodiment, each prospective fill unit includes just a single prospective fill element. Also, in a preferred embodiment, said characteristic data includes effect on electrical characteristics of nearby electrical circuitry. These electrical characteristics may further include timing characteristics and capacitance characteristics. The effect on the thickness of nearby connective elements also may be noted.