A computer system has a plurality of processors sharing a bus. Bus arbitration circuitry is located on each processor for determining bus access. The identity of the processor which is responsible for arbitrating bus access changes from time to time. Each processor has a plurality of possible arbitration...http://www.google.com.tw/patents/US4730268?utm_source=gb-gplus-share專利 US4730268 - Distributed bus arbitration for a multiprocessor system
