随着高速采集系统的采样速率的增大和采样精度的提高，如何设置PCI Express系统的参数，充分利用PCI Ex⁃press总线的带宽，以满足高速海量数据的实时传输就变得非常重要。在此分析了PCI Express系统数据传输开销的来源，研究了几种主要的系统参数，以提高数据吞吐量。通过使用PLDA 的EZDMA2 IP核，在Xilinx KC705评估板上对各个参数进行测试，结果表明，灵活设置这些关键的系统参数可以利用较少的FPGA资源，同时达到较高的传输带宽，对PCI Express系统设计具有非常高的参考价值。%With increase of sampling rate and improvement of sampling precision of high⁃speed acquisition system,it is very important to know how to set the parameters PCI Express system and to make full use of PCI Express bus bandwidth,so as to meet the high⁃speed real⁃time transmission of mass data. In this paper,the data transfer overhead of PCI Express system is analyzed and several major system parameters are investigated to improve data throughput. By using EZDMA2 IP core in PLDA, various parameters were tested on Xilinx KC705 evaluation board. The results show that flexible setting of these critical system parameters can occupy fewer FPGA resources while achieving higher transmission bandwidth. It has a very high reference value for PCI Express system design.
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