共查询到20条相似文献,搜索用时 78 毫秒
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介绍了一种数据采集系统的设计,该系统以FPGA作为逻辑控制的核心,以USB2.0作为与上位机数据传输的接口,能实现上位机和下位机的数据传输。文章描述了系统的主要组成和FPGA模块化设计的实现方法,主要介绍了USB通信开发并给出了其核心模块的时序仿真波形图。实验证明能通过该USB接口采集数据信息。 相似文献
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介绍了一种数据采集系统的设计,该系统以FPGA作为逻辑控制的核心,以USB2.0作为与上位机数据传输的接口,能实现上位机和下位机的数据传输。文章描述了系统的主要组成和FPGA模块化设计的实现方法,主要介绍了USB通信开发并给出了其核心模块的时序仿真波形图。实验证明能通过该USB接口采集数据信息。 相似文献
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文章针对传统通用串行总线(USB)接口器件存在的数据传输速率低、无法满足USB接口数据的快速传输需求问题,展开高速集成处理器USB接口的设计研究。通过基于OpenVPX的高速集成数据处理、USB接口连接方式设计、USB接口寄存器初始化,实现USB接口的高速通信。通过实验证明,该USB接口与USB 3.0接口相比有效提高了对数据传输的速率,满足数据实时高速传输需要。 相似文献
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为了解决高速数据传输系统中的速度瓶颈问题,设计了一种基于CY7C68013的高速USB2.0数据传输系统。本文简要介绍了CY7C68013的主要特点和外部硬件连接,阐述了USB固件程序设计、设备驱动程序设计和PC端的应用程序设计的方法。测试结果表明,系统通过USB接口实现了高速可靠的数据传输。 相似文献
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采用高速USB接口连接计算机终端与UWB通信系统基带模块,设计并实现了USB接口电路,控制UWB通信系统基带模块与USB接口设备的数据传输,最终实现了终端电脑与UWB通信系统的数据传输。实际测试中,USB接口的速率约为300MB/s,达到了USB2.0规范所规定的高速传输的要求。 相似文献
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By means of exact conformal mapping method we have defined character of dependence of squares amounts of angular part of film
element on angled part dimension. We propose relations, approximating obtained dependence. Calculation results and experimental
researches of large-scale models are represented. 相似文献
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Moshrefzadeh R.S. Radcliffe M.D. Lee T.C. Mohapatra S.K. 《Lightwave Technology, Journal of》1992,10(4):420-425
The temperature dependence of refractive index of polymer films was determined for a number of slab waveguides by a grating coupling method. This dependence was examined as a function of parameters such as molecular weight and glass transition temperature of the polymer. Temperature-induced changes in N TE-N TM , N being the effective index, were studied systematically for different slab waveguide compositions. It is shown that with proper device design and choice of polymeric materials, thermal effects can be reduced 相似文献
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The approaches to prepare a uniform and unified scientific terminology of chemical carcinogenesis are presented. The main definitions proposed (carcinogen, initiation, promotion, mutagen, multistage carcinogenesis, anti-carcinogen, cocarcinogen, carcinogenic risk, etc.) are based on the current state of comprehending mechanisms of the action of chemical carcinogens. 相似文献
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The article describes a model representation of radar probing data in form of a mixture of background and target samples, which is the sum of two random variables with very different parameters. For model development we research the behavior of the central moments of the distribution mix without assuming the distribution law form. An example it is described the detection of the signal at the output of compression system of chirp ionosonde. 相似文献
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解决IP网QoS问题是目前通信领域的研究热点之一.虽然研究已经取得了一定的进展,但人们对于IP 网QoS本身的含义及相关的问题还有着不同的理解.本文将从IP网QoS的定义入手讨论相关的一些问题以及解决IP网QoS问题所做的各种努力. 相似文献
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《Proceedings of the IEEE. Institute of Electrical and Electronics Engineers》1968,56(6):1024-1032
Assuming that visual responses are due to the action of particles on the membrane of the visual cells, the stochastic variability of the response should be a function of the number of particles producing it. Quantitative predictions can be made with the aid of a model proposed in previous articles. It is found that responses produced in visual cells of Limulus by absorption of a single photon have the stochastic properties which would be expected if the response to one photon were brought about by 25 particles. It is concluded from this that the processes leading to visual responses produce multiplication of particles. The effects of temperature and of metabolic poisons suggest that these processes are of chemical nature. 相似文献
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《半导体学报》2008,29(12):2470-2470