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.     

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。     

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。     

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。     

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。     

蓄能水电厂模拟与数字视频监控综合组网应用

文章分别介绍了模拟视频监控系统以及基于IP网络的数字高清视频监系统各自的特点,并对其特点进行针对性分析。基于已有的模拟视频监控系统的基础上,加入网络高清数字视频监控系统的部署,实现蓄能水电厂中高清网络视频监控与模拟视频监控综合组网的目的,解决平台兼容、图像优化、内存扩容、统一调度管理等问题。     

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.     

Nanoimprint Lithography -A Next Generation High Volume Lithography Technique

IntroductionNanoimprint Lithography is a well-acknowl-edged low cost, high resolution, large area pattern-ing process. It includes the most promising methods,high-pressure hot embossing lithography (HEL) [2],UV-cured imprinting (UV-NIL) [3] and micro contactprinting (m-CP, MCP) [4]. Curing of the imprintedstructures is either done by subsequent UV-lightexposure in the case of UV-NIL or by cooling downbelow the glass transition temperature of the ther-moplastic material in case of HEL…     

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.     

Influence of PVK ： NPB hole transporting layer on the characteristics of organic light-emitting devices

A doping system consisting of NPB and PVK is employed as a composite hole transporting layer （CHTL）. By adjusting the component ratio of the doping system, a series of devices with different concentration proportion of PVK ： NPB are constracted. The result shows that doping concentration of NPB enhances the competence of hole transporting ability, and modifies the recombination region of charge as well as affects the surface morphology of doped film. Optimum device with a maximum brightness of 7852 cd/m^2 and a power efficiency of 1.75 lm/W has been obtained by choosing a concentration proportion of PVK ： NPB at 1：3.     

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.     

Analysis of error performance on Turbo coded FDPIM

Due to variable symbol length of digital pulse interval modulation（DPIM）, it is difficult to analyze the error performances of Turbo coded DPIM. To solve this problem, a fixed-length digital pulse interval modulation（FDPIM） method is provided. The FDPIM modulation structure is introduced. The packet error rates of uncoded FDPIM are analyzed and compared with that of DPIM. Bit error rates of Turbo coded FDPIM are simulated based on three kinds of analytical models under weak turbulence channel. The results show that packet error rate of uncoded FDPIM is inferior to that of uncoded DPIM. However, FDPIM is easy to be implemented and easy to be combined, with Turbo code for soft-decision because of its fixed length. Besides, the introduction of Turbo code in this modulation can decrease the average power about 10 dBm, which means that it can improve the error performance of the system effectively.     

A method for calculating the center position of collimated light

It is a key problem to accurately calculate beam spots＇ center of measuring the warp by using a collimated laser. A new method, named double geometrical center method （DGCM）, is put forward for the first time. In this method, a plane wave perpendicularly irradiates an aperture stop, and a charge couple device （CCD） is employed to receive the diffraction-beam spots, then the geometrical centers of the fast and the second diffraction-beam spots are calculated respectively, and their mean value is regarded as the center of datum beam. In face of such adverse instances as laser intension distributing defectively, part of the image being saturated, this method can still work well. What＇s more, this method can detect whether an unacceptable error exits in the courses of image receiving, processing and calculating. The experimental results indicate the precision of this method is high.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.