A priority based output arbiter for NoC router

Network-on-Chip (NoC) is an on-chip communication method with good scalability and reliability. One of the most important issues of NoC design is low transmission latency design. In this paper, we propose a priority based output arbitration method to eliminate the congestion state of the NoC. By detecting and dispatching the packet requirements from different directions, the packets have different priorities. According to the priorities, the packets can pass the congested router in order. Simulation results demonstrate that the proposed method can reduce the transmission latency about 20% in uniformly distributed traffic and about 30% in hot-spot traffic when compare with the conventional router. In the router design, the new arbiter area overhead is less than 1%.