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It is important to design on-chip crossbar by using appropriate traffic model. A kind of Â¿4-high-1-lowÂ¿ traffic model is presented based on analysis of the character of unbalanced traffic among input port and output port of on-chip crossbar in 2D-Mesh NOC. Then it is analyzed how the performance of on-chip crossbar is impacted by Â¿4-high-1-lowÂ¿ traffic model according to simulation. The impact of Â¿4-high-1-lowÂ¿ traffic model is concluded finally and open problems are presented.