An electronic design automation method configured to automatically design a semiconductor device includes generating a site-row having a unit height based on a standard cell having the unit height, and generating metal routing tracks which begin at an offset point spaced a specific distance from an origin point of the site-row. The unit height is a non-integer multiple of a spacing of metal lines of one of interconnection layers of the semiconductor device. Using this process, a layout of a plurality of standard cells on a plurality of site-rows, and constituting a Floorplan of the semiconductor device, is generated.