A router, which is basically a point-to-point communication router, is devised for the BUS-like communication between processors. The abstraction layer interface includes a set of resource access methods and a database containing bus, device, function and resource information for various devices in a system. The mixer is further coupled to a demodulator and filter which in turn is coupled to an amplifier and a comparator. Setting LUT value to watermark value with largest probability, subject to run constraint. Each of the negative level shifters is configured to generate a converted multiplexing signal corresponding to a respective multiplexing signal by converting a multiplexing signal having a ground voltage into a converted multiplexing signal having a first negative voltage.