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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。
Introduced the structure of DMA high-speed transmission system and the design of DMA, set up a PCIE system of × 8 channels. Throughout the system board terminal, connected to the two FIFOs, provides a standard FIFO interface, can connect fiber optic data, CT image acquisition data, A / D sampling data. The experiment verifies the reliability of DMA transfer and DMA write transfer, and tests the transfer speed of DMA read and write. Experiments show that in a single DMA transfer size up to 1MB, × 8-channel PCIE system DMA read and write speeds can reach 1 000MB / s, to meet most of the requirements of high-speed data transmission.