基于DSP和CPLD的FPGA在线配置

介绍Xilinx公司FPGA的几种基本配置模式,在实际图像处理算法评估系统中设计了基于DSP和CPLD的配置电路,完成对系统中FPGA的在线从并行(SelectMAP)配置.减少器件数目,增加硬件系统的灵活性,并详细介绍该配置电路的具体实现过程和实现方法.     

MCS-51与FPGA/CPLD总线接口逻辑设计

设计一种基于MCS-51单片机与FPGA/CPLD的总线接口逻辑电路,实现单片机与可编程逻辑器件数据与控制信息的可靠通信,使可编程逻辑器件与单片机相结合,优势互补,组成灵活的、软硬件都可现场编程的控制系统.设计中采用VHDL语言,实现MCS-51单片机与FPGA/CPLD的总线接口逻辑设计.实验表明,该总线接口逻辑电路工作稳定、可靠,使MCS-51单片机与FPGA/CPLD能够完美结合.     

单片机与FPGA/CPLD总线接口逻辑设计

设计一种基于MCS-51单片机与FPGA/CPLD的总线接口逻辑,实现单片机与可编程逻辑器件数据与控制信息的可靠通信,使可编程逻辑器件与单片机相结合,优势互补,组成灵活的、软硬件都可现场编程的控制系统.在设计中采用VHDL语言,实现MCS-51单片机与FPGA/CPLD的总线接口逻辑设计.试验表明,该总线接口逻辑工作稳定、可靠,使MCS-51单片机与FPGA/CPLD能够完美结合.     

用CPLD和FLASH存储器配置FPGA

随着FPGA生产商推出更高密度FPGA器件,要求更多的配置芯片存储配置数据并配置FPGA.本文介绍了采用计算机并口下载配置数据并用CPLD、FLASH存储器组成的被动串行（PS）配置系统配置高密度FPGA的方法,其方法是用CPLD作为控制器控制FLASH存储器对高密度的FPGA进行配置,通过使用一个FLASH存储器和一个CPLD器件可代替容量有限的专用配置芯片,具有配置速度快、实现容易的特点.     

FPGA的AP模式及在可重构仪器中的应用

针对目前在可重构仪器设计采用PS配置方式需增加CPLD或单片机配置电路且配置时序较繁琐的问题,提出一种基于FPGA的AP配置模式可重构仪器设计方案.采用flash和SD卡存储软硬件配置文件,在SOPC Builder中调用ALTREMOTE UPDATE、PFL和SD卡控制器IP核,实现FPGA的AP配置模式.该模式...     

基于I2S总线实现嵌入式语音采集与回放

提出了基于I2S总线,使用嵌入式微处理器LPC2478和立体声编解码器UDA1380实现嵌入式语音采集与回放的方法;在简要介绍I2S总线原理、LPC2478的I2S总线接口特点和立体声编解码器UDA1380的基础上,详细描述了LPC2478与U-DA1380之间的硬件接口设计:语音数据传输采用I2S总线,控制命令传输采用L3总线,也详细说明了系统软件设计:使用LPC2478的I/O引脚模拟L3总线实现对编解码器UDA1380的初始化,将LPC2478的I2S总线输入、输出通道均初始化为主模式,并连接至GPDMA,设计了用于I2S数据处理的GPDMA驱动程序,最后说明了语音采集和回放程序的实现流程。     

基于Nios Ⅱ的WTB网络节点机的设计与配置

绞线式列车总线(WTB)是TCN制订的用于列车级车载数据通信的总线标准;根据WTB标准和实际的功能需求设计出系统框架方案,该方案采用FPGA作为核心器件,将Altera的Niso Ⅱ软核处理器与WTB控制逻辑集成在单片FPGA内,并利用CPLD配置控制器从Flash存储器中读取配置文件对基于Nios Ⅱ的嵌入式可编程逻辑器件FPGA进行系统配置和配置文件升级的新方案;大幅度地减小了产品的体积和重量,降低了硬件开发成本.     

基于LXI总线的可重构软硬件一体测试仪

为解决传统测量仪器在功能、成本和体积等方面的矛盾,介绍了一种基于LXI总线的可重构软硬件一体测试系统;该系统由ARM、FPGA、CPLD等器件协同工.作,通过LAN接口从PC机获取配置命令,在线配置FPGA电路结构.配合多路模拟信号采集和发生单元,可同步实现示波器、多用表和激励源等多种仪器功能,并可进行灵活组合;可重构一体测试仪具有LXI总线设备升级成本低廉、使用灵活等优点,同时充分利用FPGA在线可重配置技术和通用信号调理技术,实现了多仪器功能的集成;为未来型号测试任务中应用可重构测试技术奠定了基础.     

基于CPLD的多普勒声纳回波信号仿真卡设计实现

介绍一种基于CPLD的多普勒声纳回波信号仿真卡的设计实现,该板卡作为PXI测试系统的一个组成模块,数据交换基于PXI总线,使用S5920实现总线控制,利用CPLD实现板卡的时序逻辑控制,外围电路包括信号调理与匹配电路、DDS电路、A/D采集电路、高速FIFO存储电路、D/A转换电路等。重点介绍了CPLD内部功能模块的实现。该设计已成功应用于多普勒声纳的PXI测试系统中。     

基于CPLD的FPGA快速配置电路的设计

介绍了采用CPLD和Flash器件对FPGA实现快速并行配置,并给出了具体的硬件电路设计和关键模块的内部编程思路。     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

基于QTE的蒙古文显示机制研究与实现

蒙古语言是中国蒙古族使用的通用语言,由于蒙古文区别于其他文字的书写方式和其自身变形机制等特点,在很多通用的文字处理引擎中都不被支持。在嵌入式产品开发与应用领域中Linux加QTE已经成为流行方式。该文给出了一种在QTE环境上实现基于标准Unicode的蒙古文点阵显示和变形算法, 并自定义了支持蒙古文的QTE组件,扩展了QTE功能,为在Linux加QTE方式的嵌入式体系结构中处理蒙古文提供了一种解决方法。