Ethernet Spectrum Data Transmission Technology Research Based On Fpga

Spectral imaging is a new technology which combines image technology with spectroscopy. It obtains two-dimensional space information and one-dimensional spectrum information of imaging target at the same time. This information reflects not only the shape of the imaging target but also the spectral characteristics which reveal material composition of the object’s surface. Each image cube is formed by a number of spectral images that the number is determined by the coding order of Hadamard. Therefore, these kind of spectral images have large data sources which need high-speed data transmission to achieve real-time transmission and processing requirements. USB, Ethernet and IEEE1394communication protocols are commonly used in these imagers. In this study, it briefly introduces the system of this multispectral imager based on Hadamard transform and then introduces realization of high-speed data transmission in detail.Firstly, this paper introduces background and significance of our research subject on the extensive application of spectral imaging technology and the demand of high-speed data transmission. It is widely demand in the domain of hazard assessment, geological exploration, marine monitoring and other areas for its image cube which includes space information and spectral information both. Spectrometers which have been put into use have proven theirs superiority and necessity in these areas. This paper briefly introduces the principle of this multispectral imager based on Hadamard transmission. It includes the Hadamard transform principle, DMD principle and the principle of spectral imaging. The complete system block diagram of this imager is given after describing the whole working process in detail.Secondly, high-speed data transmission technology has become one of the research foci in these years along with the broad application of the multispectral imager. Comparing USB, Camera link, Ethernet and IEEE1394these common used communication protocols, we choose the most appropriate communication protocol-Ethernet. This paper particularly introduces development process of Ethernet based on FPGA. It introduces the most important part of Ethernet-the MAC layer and the overall design which includes the design of send module, receive module and implementation of PHY. Through needs analysis, we decide to adopt Spartan3A DSP 1800A produced by Xilinx company to achieve MAC layer functions and DP83865DVH produced by National Semiconductor company to achieve physical layer functions. In this paper it calls Ethernet Lite MAC a kind of IP core of MAC, and introduced the whole development process of communication based on IP core. It proves that using IP core in development of embedded system is more quickly and effectively. It saves a lot of time, manpower and resources. Finally, the experimental results of Ethernet system show that Ethernet transmission system performance good in this spectral imager system. It can achieve the system requirements excellently. At the end of the paper, the development tendency and application prospect of High-speed data transmission using in spectral imaging domain are discussed. It points out the direction of further study for the author.