一种基于PCI Express总线的DMA高速传输系统

A High-Speed DMA Transmission System Based on PCI Express Bus

介绍了DMA高速传输系统的结构以及DMA的设计,搭建了×8通道的PCIE系统。在整个系统的板卡终端,连接了两个FIFO,提供标准的FIFO接口,能连接光纤数据、CT图像采集数据、A/D采样数据等。实验验证了DMA读和DMA写两种传输方式的可靠性,测试了DMA读写的传输速度。实验表明,在单次DMA传输大小达到1MB时,×8通道的PCIE系统DMA读和写速度均能达到1 000MB/s,可满足大部分高速数据传输的要求。

A high speed transmission system based on PCI Express bus was described,together with the design of DMA.Two FIFOs were fitted at both ends of the transmission card to provide standard FIFO interface,which was connected with fiber channel data,CT image acquisition data,A/D sampling data,etc.Experimental results verified the reliability of transmission in DMA read/write modes,and the speed of DMA transaction was measured.It has been shown that the high speed transmission system based on lane 8 PCI express bus had a DMA transaction speed up to 1 000 MB/s for a DMA transfer size of 1 M byte,which meets the requirement of most high speed data transmission applications.