Abstract — The orientation of a bus is defined as the direction from the Least Significant Bit (LSB) to the Most Significant Bit (MSB). Bused pin flipping is a property that allows several bused pins to flip without changing the system functionality. In this paper a simultaneous bus orientation and bused pin flipping algorithm is presented. The algorithm can be integrated into a bus-centric floorplanner targeting bus-rich designs such as microprocessors. Experimental results show that a floorplanner enhanced by the algorithm produces high quality floorplans in terms of bus routing. I