In a synchronous arbitration unit with round-robin priority for arbitrating between N requests (Ri) for access to common resources of a multiprocessor system, the requests stored in an input register timed by a clock signal are applied as inputs to a fixed-priority arbitration network having 2N-1 inputs,...http://www.google.com.hk/patents/US5870560?utm_source=gb-gplus-share專利 US5870560 - Arbitraion unit with round-robin priority, particularly for multiprocessor systems with syncronous symmetrical processors
