The Design & Implementation Of High- Speed Data Transmissions Based On The PCIE Bus And DMA

Technology of data acquisition plays an very important role in the field of signal and information processing,and the developments of high-speed data transmission technology is the key part in data acquisition system. With the development of the latest industry technology and computer referance, the requirement of the data-acquisition equipment has been hard to satisfy the require of higher bandwidth, larger capacity and real time data precessing.The high_speed data transmission technology also becomes an important control to develop the performance of data collection system.PCI Express(PCIe) Bus,used as a new generation of the standard of I/O local bus, has an excellent service quality and the efficiency of data transmission and is replacing the other traditional local bus such as the PCI and AGP. PCIe bus technology provides an effective technology support of high-speed of data transmission for the data-acquisition system, so that the developments of the high-speed of data acquisition equipment to a rapid development and application.DMA is a technology which makes the memory can directly access data with a peripheral possible, it has the feature that the CPU doesn’t take part in it’s work and also out of the control. The application of DMA technology in the field of Soc is developing rapidly,Using the technology of DMA to complete the transmission of large data is a main existing technique of data transmission system.In the dissertation, the design of DMA system, working with the PCIe has a good practical value in the transmission of high-speed of data acquisition. Based on PCIe bus,the DMA transmission mode makes full use of the stable and efficient transmission efficiency of PCIe bus can satisfy the requirements of device for high-speed data transmission, at the same time using the DMA will reduce the occupied proportion of treatment time on the processor data transmission and storage in processor,help to work on the abiliy of data process, effectively improve the performance of data acquisition system. The project of DMA and PCIe bus terrace is based on FPGA.