一种基于Rocket I／O的视频数据采集和高速串行传输系统的设计与实现

介绍了一种以VIRTEX Ⅱ PRO系列FPGA中Rocket I／O为核心的视频数据采集和高速串行传输系统的实现方案。分析了高速串口通信的同步方法，自定义了一种简单的数据帧结构，完成了数据率为1．25Gbps的点对点高速传输。     

Actel的FUSION可编程系统芯片获创新大奖

Actel公司宣布业界首款混合信号现场可编程门阵列(FPGA)———ActelFusion(tm)可编程系统芯片(PSC)荣获EDN杂志颁发2005年度数字IC和可编程逻辑类别的创新大奖。屡获殊荣的ActelFusionPSC能前所未有地将混合信号模拟功能、嵌入式Flash内存和FPGA架构集成到单芯片上,让设计人员迅速从概念步入完整的设计,并向市场推出功能丰富的系统。ActelFusion系列器件前所未有地将可编程模拟功能、高达8Mbit的高性能Flash内存,以及高达150万个系统门的系统内可编程(ISP)FPGA架构,集成到单芯片PSC上。ActelFu sion器件延续了该公司单芯片…     

FPGA和高集成度EPLD向门阵列挑战(下)——集成度更高的新一代反熔丝FPGA和可擦式CPLD达到系统级的集成水平

上文讲述高集成度现场可编程门阵列(FPGA)和复杂PLD(CPLD)的许多新结构,厂家提供的基于RAM的FPGA已达到10万个门的集成度,与门阵列相当.电可擦的、紫外线可擦的和一次性可编程的反熔丝FPGA也有类似的新发明.它们使设计师在设计系统时有了更多的解决办法;这些系统需要可编程器件带来的灵活性,但其需要量又不值得使用掩模编程的门阵列.虽然迄今为止的大部分开发工作都放在数字逻辑上,但混合信号系统的设计师也开始注意可编程技术的好处.International Microelectronic Products公司推出的第一个可编程模拟阵列使模拟系统设计师可以在系统中重新进行编程,并拥有很广泛的模拟资源(请     

数字匹配滤波器的优化设计与FPGA实现

介绍在直接序列扩频通信中应用数字匹配滤波器实现m序列同步,分析其具体结构,详细讨论了其基于FPGA(现场可编程门阵列)的性能优化.结果表明,数字匹配滤波器用FPGA实现时,能够大大减少资源占用,并提高工作效率.     

满足应用和发展的需求,XILINX推出多项FPGA最新产品

现场可编程门阵列(FPGA)由掩模可编程门阵列(MPGA)和可编程逻辑器件(PLD)两者演变而来并将它们的特性结合在一起,因此FPGA既有门阵列的高逻辑密度和通用性,又有可编程逻辑器件的用户可编程特性.它通常由布线资源围绕的可编程逻辑单元构成阵列,又由可编程I/O单元围绕阵列构成整个芯片,排成阵列的逻辑单元由布线通道中的可编程内连线连结起来实现一定的逻辑功能.对于ASIC设计来说,采用FPGA在实现小型化、集成化和高可靠性的同时,减少了风险,降低了成本,缩短了周期.这些特点使FPGA近年来发展迅速.Xilinx公司为适应各种应用的需要,在1995年推出多个新产品系列,如有双口RAM的XC4000E,大容量低成本的XC5200系列,反熔丝型门海结构的XC8100系列和可再配置协处理器的XC6200系列等,以及XACT6.0开发系统,由此也可看出FPGA的发展势头.本文以XC8100系列为主对其新产品作一介绍.     

基于FPGA NiosⅡ的信号发生器设计

介绍一种应用Nios Ⅱ嵌入式处理器的可编程片上系统(system-on-a programmable-chip,简称SOPC)技术来实现信号发生器的设计方案.该系统以Altera公司的Cyclone系列现场可编程门阵列(FPGA)为数字平台,将微处理器、总线、存储器和I/O接口等硬件设备集中在一片FPGA上,并利用数字调制技术使系统得到了正弦波、方波和三角波等.通过FPGA中双口RAM的数据读写产生波形.再充分利用片上资源,提高系统的精确度、稳定性和抗干扰性能.     

基于FPGA的直接数字频率合成技术设计与实现

介绍了利用现场可编程逻辑门阵列FPGA实现直接数字频率合成 (DDS)的原理、电路结构和优化方法。重点介绍了DDS技术在FPGA中的实现方法 ,给出了采用ALTERA公司的ACEX系列FP GA芯片EP1K30TC -144进行直接数字频率合成的VHDL源程序。     

Lattice高密度可编程逻辑器件开发工具简介

Lattice公司的GAL器件(通用阵列逻辑)以其可反复编程、结构灵活、高速度和低功耗等特性而闻名全球,被广泛用于各种数字电子系统。近年来,该公司又相继推出了高密度可编程逻辑器件——pLSI(可编程大规模集成)和ispLSI(在系统可编程大规模集成)系列产品。这类芯片将PLD器件的特有性能与FPGA器件的高密度和灵活性结合起来,在运行速度、集成密度、可应用性等方面成为当今最先进的高密度可编程逻辑器件。 为了确保用户能方便、高效、高利用率地开发和应用pLSI和ispLSI系列器件,Lattice公司同时推出了支持pLSI和ispLSI高密度可编程逻辑器件逻辑设计的开发工具软件系统。     

数字下变频与脉冲压缩系统的设计与实现

数字下变频与脉冲压缩一直是雷达信号处理中的关键技术之一。应用现场可编程门阵列(FPGA)的IP核技术,研究了一种基于FPGA的数字下变频与脉冲压缩系统的实时实现方法。首先提出了系统的整体结构,然后介绍了数字下变频模块、脉冲压缩模块及接口模块的设计方法。在单片FPGA上实现了对实际采集的中频Chirp信号进行8K点或2K点可变点数的数字下变频与脉冲压缩处理,通过与Matlab软件计算结果的对比,验证了FPGA实时计算的正确性。最后分析了系统的可实现性与实时性。     

市场指南

AMD下属的Vantis(威特信)公司(总部在美国加州Sunnyvale)专门从事开发可编程逻辑器件,它的产品包括现场可编程门阵列(FPGA)、复杂可编程逻辑器件(CPLD)、简单可编程逻辑器件(SPLD)以及设计软件。最近,Vantis宣布推出VF1系列FPGA器件及Direct-DesignTM设计软件。和其它FPGA的开发策略不同,VF1是以软件为中心设计器件的结构,是先有软件后有可编程门阵列器件,因此软件和硬件都便于用户使用。Vantis的软件工具Dcsign-DirectTM和用户已经拥有的第三方EDA软什工具(例如原理图输入、捕捉及模拟、     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Development of the readout system for waveguide multilayer optical card

Waveguide multilayer optical card （WMOC） is a novel storage device of three-dimensional optical information. An advanced readout system fitting for the WMOC is introduced in this paper. The hardware mainly consists of the light source for reading, WMOC, motorized stages addressing unit, microscope imaging unit, CCD detecting unit and PC controlling ＆ processing unit. The movement of the precision motorized stage is controlled by the computer through Visual Basic （VB） language in software. A control panel is also designed to get the layer address and the page address through which the position of the motorized stages can be changed. The WMOC readout system is easy to manage and the readout result is directly displayed on computer monitor.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

Collinear phase-matching study of terahertz-wave generation via difference frequency mixed in GaAs and Inp

The collinearly phase-matching condition of terahertz-wave generation via difference frequency mixed in GaAs and InP is theoretically studied. In collinear phase-matching, the optimum phase-matching wave hands of these two crystals are calculated. The optimum phase-matching wave bands in GaAs and lnP are 0.95-1.38μm and 0.7-0.96μm respectively. The influence of the wavelength choice of the pump wave on the coherent length in THz-wave tuning is also discussed. The influence of the temperature alteration on the phase-matching and the temperature tuning properties in GaAs crystal are calculated and analyzed. It can serve for the following experiments as a theoretical evidence and a reference as well.     

Effects of the alloy compositions on the phonon-polaritons in ternary mixed crystals

Composition dependence of bulk and surface phonon-polaritons in ternary mixed crystals are studied in the framework of the modified random-element-isodisplacement model and the Bom-Huang approximation. The numerical results for Several Ⅱ - Ⅵ and Ⅲ- Ⅴ compound systems are performed, and the polariton frequencies as functions of the compositions for ternary mixed crystals AlxGa1-xAs, GaPxAS1-x, ZnSxSe1-x, GaAsxSb1-x, GaxIn1-xP, and ZnxCd1-xS as examples are given and discussed. The results show that the dependence of the energies of two branches of bulk phonon-polaritons which have phonon-like characteristics, and surface phonon-polaritons on the compositions of ternary mixed crystals are nonlinear and different from those of the corresponding binary systems.     

New insert layer structure OLEDs

An insert layer structure organic electroluminescent device（OLED） based on a new luminescent material （Zn（salen）） is fabricated. The configuration of the device is ITO/CuPc/NPD/Zn（salen）/Liq/LiF/A1/CuPc/NPD/Zn（salen）/Liq/LiF/A1. Effective insert electrode layers comprising LiF（1nm）/Al（5 nm） are used as a single semitransparent mirror, and bilayer cathode LiF（1 nm）/A1（100 nm） is used as a reflecting mirror. The two mirrors form a Fabry-Perot microcavity and two emissive units. The maximum brightness and luminous efficiency reach 674 cd/m^2 and 2.652 cd/A, respectively, which are 2.1 and 3.7 times higher than the conventional device, respectively. The superior brightness and luminous efficiency over conventional single-unit devices are attributed to microcavity effect.