In this paper, we study and implement a routabilitydriven floorplanner with buffer block planning. It evaluates the routability of a floorplan by computing the probability that a net will pass through each particular location of a floorplan taken into account buffer locations and routing blockages. Experimental results show that our congestion model can optimize congestion and delay (by successful buffer insertions) of a circuits better with only a slight penalty in area. 							
						
							
					 															
					Wai-Chiu Wong, Chiu-Wing Sham, Evangeline F. Y. Yo