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A method is proposed to guarantee bandwidth (BW) or latency of network-on-chip. This method contains three kernels: traffic classification; flit-based switching; path pre-assignment and link-BW setting. Compared with the traditional circuit-switch method, the proposed method can guarantee the latency between one flit's generation in the source node and its reception in the destination node. This method also supports a wide range of traffic types such as latency critical, low BW traffic and streaming data which only have BW requirement. Moreover, router and network interface which support the proposed method are implemented and a maximum latency formula is developed. Simulation and synthesis results show that this method can guarantee the BW and latency well and is relatively low cost.