基于NIOS II处理器内部总线的UART模块设计

本文对利用FPGA实现嵌入式软核以及Nios II软核系统等进行了简要介绍,对其内部互联Avalon总线开展了详细分析,同时结合工作需求,开展了基于Avalon总线的自定义UART模块设计及IP定制工作,通过实际接口功能测试,结果表明利用Nios II软核系统及自定义UART模块定制IP的方式,可以使得软核系统设计更为紧凑,模块复用更为方便,同时还可避免视图混乱,提高工作效率.     

江苏有线融合视频点播推流体系建设

随着5G等移动互联网技术的蓬勃发展,以及“全国一张网”整合进度加快,全平台IP化改造已成为技术发展的趋势。但由于IP化改造需要同步改造现有终端、接入网、骨干网以及前端各业务平台,投入与成本巨大,需要一段时间逐步过渡。因此,如何在技术演进的过程中,充分利用现有系统,降低成本,提高效率,支撑业务快速发展,是现阶段视频点播推流系统改造的重点。江苏省广电有线信息网络股份有限公司从业务发展出发,在完成IP推流系统建设的同时,与原推流系统相融合,兼容不同的网络及终端环境,为江苏有线业务发展提供了基础。     

基于IP技术的内部通话系统方案设计及实践

以2021年世界智能大会主会场的内部通话系统为例,阐述节目制作对通话技术的需求以及以CLEAR COM通话矩阵为核心的IP通话系统的设计方法和应用情况.传统的通话系统始终无法解决多地域的实时通话调度难题,此次系统设计结合IP技术在内部通话中的应用,在满足常规通话需求的基础上,非常好地解决了传统通话系统的痛点,满足了高通话质量和跨系统、跨地域通话兼容的技术要求,提升了系统的实用性及灵活性.     

飞思卡尔以高性能、分组友好的通信引擎推动PowerQUICC架构的进步

瞄准融合性分组网络市场的MPC8360EPowerQUICCTM II Pro处理器系列,采用了专为多协议互通和第3层分组处理应用而设计的下一代QUICCEngineTM技术分组交换网络(PBN)的演进历程正重新塑造着有线和无线接入网络,也需要通信设备市场提供各种成本经济、与现有软件兼容的IP融合(IP convergence)方案。飞思卡尔半导体(NYSE:FSL,FSL.B)正以下一代PowerQUICC处理器的推出解决了这些融合/兼容/成本挑战,这种新的处理器集成了PowerPC内核和1个新的、分组友好的(packet-friendly)通信引擎。集成了QUICC Engine技术的MPC8360E Po…     

可配置的TFT-LCD控制器IP核的设计

设计实现了一种基于Avalon总线的,显示分辨率和像素深度均可配置的TFT-LCD控制器IP核.根据自顶向下的设计思想,将IP 核进行层次功能划分设计,采用Verilog 硬件描述语言实现该控制器以及它的外围逻辑时序的全部功能.并对IP 核进行仿真验证,最后加入到Nios II系统中,该IP 核经测试效果良好.     

Radyne ComStream为泛美卫星公司Internet干线提供IPSat卫星 Internet终端

20 0 1年 9月 15日 ,泛美卫星公司正式宣布使用 Radyne Com Stream的 IPSat卫星 Internet终端开展新的卫星双向传输服务 ,以此在泛美全球卫星通信网上提供更加灵活、性价比更优异的卫星 Internet接入系统解决方案。该方案包括DVB出境链路、 SCPC回传链路、通信港链路及对 Tier One干线供应商的直接连接。Radyne Co m Stream独一无二的 IPSat系统通过卫星提供宽带双向 TCP/ IP通信 ,该系统支持远端站采用双向或单向两种工作方式 ,且兼容 MEPG - II图像和 IP数据的传送 ,其出境载波为标准 DVB - IP广播载波。远端站 IPSat集…     

基于FPGA IP核的扫描式激光测径方法

快速、精确地测量对激光测径技术具有重要意义,考虑到传统单片机检测速度慢、时耗开发大等问题,文中提出了一种基于FPGA IP核技术的扫描式激光测径系统的设计方案及实现方法。同时在Quartus II集成环境中进行了系统的综合、布局布线及时序仿真。仿真结果验证构建有IP核的激光测径系统,运算速度快,测量数据精确、且便于升级。     

IPv4地址不足解决方案综述

IPv4地址不足的问题日益严重,业界主要有两条解决路径：一是非兼容方式的升位,这就是采用全新的IP地址协议,如IPv6;另外一条路径是采用兼容方式的路径,如NAT（网络地址转换）技术、SuIP（超级协议）技术。文章对IPv6,NAT以及SuIP等三种技术的优势和不足进行了分析,然后对这三种技术进行了比较,最后展望了这三种解决方案的发展前景。     

基于软核CPU技术的IP电话接口设计

提出了一种基于会话初始化协议的VoIP系统(包括IP电话终端、SIP服务器和PSTN接入端口),并对SIP与PSTN的互联进行了系统级构建。利用Altera的SOPC软核CPU技术和Nios II处理器构建了一个IP电话终端。该设计具有灵活的可扩展性,能够在实现语音通信的基础上较容易地扩展视频接口、短信平台等多媒体功能,给产品用户和运营商提供了一种低成本的多媒体网络通信终端设备,具有广阔的市场前景。     

灿芯半导体获得ARMIP授权

灿芯半导体（上海）有限公司近日宣布,与ARM签署了一份长期协议,将被授权使用ARM的IP工具包,其中包括ARM Cortex^TM,ARM9／11^TM和MaliTM系列处理器口以及CoreSightTM调试追踪技术和与AMBA 兼容的系统设计IP。     

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.