The various embodiments of the present invention generally relate to systems, methods, and computer program products for placement of at least one cell in a digital integrated circuit layout. A global placement grid of coordinates is formed, where the coordinates represent horizontal and vertical directions....http://www.google.com.hk/patents/US7802219?utm_source=gb-gplus-share專利 US7802219 - Flat placement of cells on non-integer multiple height rows in a digital integrated circuit layout
