共查询到19条相似文献,搜索用时 281 毫秒
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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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本文依据PDF417条形码规格及RS编码理论,将二维条码用在财务申报管理中,鉴于目前这种情况,考虑到我国计算机技术的普及化和二维条码技术日益成熟,本文探讨用一种新的方式建立财务申报系统,即采用二维条码。通过利用二维条码,实现财务信息传递的自动化,提高财务申报的效率和质量,减少数据录入所需的庞大的人力、物力,降低数据输入、审核的错误率,从而全面提高我国财政管理的水平,促进我国税收征管体制的全面术建立高效、快捷的发展,探讨现代化管理手段。 相似文献
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本文主要讲述了USB接口及U盘数据存储的原理、介绍了USB接口的两种实现途径,最后介绍了一种通过串口转USB接口模块实现单片微处理器外挂USB移动存储设备的方案和实例. 相似文献
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Jongweon Kim Namgyu Kim Dongwon Lee Sungbum Park Sangwon Lee 《Signal Processing: Image Communication》2010,25(8):559-576
A digital object identifier refers to diverse technologies associated with assigning an identifier to a digital resource and managing the identification system. One type of implementation of a digital object identifier developed by the Korean Government is termed the Universal Content Identifier (UCI) system. It circulates and utilizes identifiable resources efficiently by connecting various online and offline identifying schemes. UCI tags can contain not only identifiers but also abundant additional information regarding contents. So, researchers and practitioners have shown great interest in methods that utilize the two-dimensional barcode (2D barcode) to attach UCI tags to digital contents. However, attaching a 2D barcode directly to a digital content raises two problems. First, quality of the content may deteriorate due to the insertion of the barcode; second, a malicious user can invalidate the identifying tag, simply by removing the tag from the original content. We believe that these concerns can be mitigated by inserting an invisible digital tag containing information about an identifier and digital copyrights into the entire area of the digital content. In this study, to protect copyrights of digital contents securely without quality degradation, we attempt to discover a sequence of process for generating a 2D barcode from a UCI tag and watermarking the barcode into a digital content. Such a UCI system can be widely applied to areas such as e-learning, distribution tracking, transaction certification, and reference linking services when the system is equipped with 2D barcode technology and secure watermarking algorithms. The latter part of this paper analyzes intensive experiments conducted to evaluate the robustness of traditional digital watermarking algorithms against external attacks. 相似文献
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介绍了一种基于USB总线的数据采集系统的设计方法,采用CYPRESS公司的EZ-USBFX2USB2.0接口的控制器,并和PC机通信且编制出完善的设备应用程序,用于高速UWB设备传输系统中进行文件传输。给出了该应用程序的编制流程,实际测试中,USB接口的速率达到了约300Mbit/s,达到了USB2.0规范所要求的高速传输的要求。 相似文献
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USB 2.0控制器支持USB 2.0协议和UTMI接口规范,其一侧通过UTMI接口连接到物理层(PHY)与USB设备通信,另一侧通过功能接口连接到微处理器。USB 2.0控制器主要由协议层、UTMI接口、功能接口、仲裁和存储器接口组成。通过对各模块功能分析,并在仿真软件中进行仿真验证,控制器满足通用设备数据传输要求。 相似文献