The Floorplanner is specifically intended to assist those users who require some degree of handcrafting for their designs. You must understand both the details of the device architectures and how floorplanning can be used to refine a design. Successful floorplanning is very much an iterative process and it can take time to develop a floorplan that outperforms an "automatically" processed design.
Because of the nature of the Floorplanner's interaction with the automatic MAP and PAR tools, several prerequisites are necessary in order to floorplan your design successfully.
