FPGA与ASSP和ASIC竞争

一系列可编程逻辑器件（PLD）替代专用集成电路（ASIC）和专用标准电路（ASSP）的趋势主要是由现场可编程门阵列（FPGA）的显著优点所造成的,这些器件在逻辑密度、性能和特性上有惊人的增长,而同时在     

基于PLD的处理器的开发环境和设计流程

在20世纪90年代末,可编程逻辑器件(PLD)的复杂度已经能够在单个可编程器件内实现整个系统。完整的单芯片系统(SOC)概念是指在一个芯片中实现用户定义的系统,它通常暗指包括片内存储器和外设的微处理器。最初声称真正的SOC——或可编程单芯片系统     

核心硅片的突破时机？

核心硅片赋予电子系统关键功能的芯片一是今年全球半导体产业中最热门的领域之一，预计其热度将保持到2010年。 核心硅片三剑客专用标准产品（ASSP），可编程逻辑器件（PLD）和专用集成电路（ASIC），第二季度销售额比第一季度增长3％，而第二季度通常是淡季。相比之下，据iSuppli，第二季度整体半导体产业仅比第一季度增长1．1％。更重要的是，第二季度核心硅片销售额比2005年同期上升12．7％，同比增幅再度高于整体半导体产业。     

Cypress倡导PSoC简化了MCU应用

Cypress公司今年的重点之一是PSoCTM(可编程系统芯片），它是由Cypress半导体的子公司── Cypress微系统公司于去年底推出的。它到底有何神奇的功能？为此，我们采访了Cypress（赛普拉斯)中国区域经理关锦明先生，及Cypress微系统公司副总裁Mike Polen。目前在市场上有几千种不同的8位微控制器(MCU），因此，设计人员要想从中选到适合自已应用的器件仍然很麻烦。此外，一般的嵌入式应用(图1)都需要附加外部器件的模拟外围器件。这样，设计工程师的理想方案是采用定制的SOC(系统芯片)，但是如果采用定制微控制器、ASIC和PLD器件，…     

汽车仪表盘用32位微控制器V850E／Dx3

NEC电了（美国）公司目前推出用于汽车电了市场的32位微控制器（MCU）最新产品V850E／Dx3。这种最新的32位微控制器是基于NEC电子受欢迎的V85032位RISCCPU核，新器件具有各种专用的外设，是首个采片用存存储器技术的微控制器芯片，非常适合用在汽车电子的仪表盘和驱动器等出用领域。     

ASIC技术的特点与应用

当今社会是信息社会,而信息社会最显著的标志就是数字化,是数字集成电路广泛应用的社会,近年来迅速发展的大规模可编程专用集成电路（ASIC）,以其强大的功能和优良的特性,在其问世不久,就受到世界范围内电子工程设计人中的极大青睐和普遍欢迎。其中,应用最广泛的是现场可编程门阵列（FPGA）和复杂可编程逻辑器件（CPLD）。本文简单介绍了这两种类型芯片的性能特点,基本结构,设计方法以及使用中的一些经验和注意事项。     

PSDsoft 2000 EDA工具使基于MCU的系统的逻辑设计自动化

Waferscale Integration公司新的PSDsoft 2000 EDA工具可以自动配置它的EasyFlash PSD器件上的可编程逻辑和存储器。EasyFlash PSD可以为多种8、16和32位微控制器提供外部闪存、SRAM、I/O和可编程逻辑,这些微控制器包括出自Infineon、摩托罗拉、Intel、Philips、Hitachi等公司的180多种。PSDsoft 2000为PSD的微控制器接口、存储器映射、芯片选择、引脚分配以及定制的外设(如状态机、计数器或移位器)完全自动地生成可编程逻辑设计流程。该工具自动地交叉检查系统和逻辑错误(这是设计MCU加外部器件的系统常常出现的问题),然后,把逻辑设计和微控制器固件合并在一起。     

PLD推动系统设计进入SOPC新纪元

产品应市时间己越来越成为关系到企业生死成败的关键因素。一个企业如果能够比其竞争对手更快地推出新产品，更快地对市场做出反应，就意味着能获取更大的市场份额和更大的利润。可编程逻辑器件（ＰＬＤ）以其灵活、便捷的特性而日益受到系统设计者的青睐，近年来在半导体领域中呈现出一枝独秀的增长态势，越来越多地成为系统级平台设计的首选，并正推动我们迈入系统芯片的新纪元。ＰＬＤ：渐受青睐可编程逻辑器件（ＰＬＤ）与专用集成电路（ＡＳＩＣ）芯片不同，ＰＬＤ是按标准器件生产出来的，芯片工厂因此可以获得规模生产效益。而用户则…     

公司动态

到单个可编程逻辑器件中（PLD）。Stratix体系的目的就是简化客户的设计过程，构建更复杂的可编程系统芯片(SOPC)方案，通过向用户提供器件、设计工具、IP以及各种服务，缩短产品上市时间，在竞争激烈的市场中赢得主动。Altera完全从头开始设计Stratix体系。新的MultiTrack布线结构包括性能优化的连续不同长度的连线，用于模块内部和模块间的连接。MultiTrack布线结构采用了DirectDrive技术，这项专有布线技术确保了器件任何功能无论如何布局都使用同样的资源和一致的性能。www.altera.com/stratixXilinx可编程解决方案对付手机窃贼…     

用FPGA技术实现模拟雷达信号

前言FPGA（现成可编程门阵列）是由掩膜可编程门阵列和PLD（可编程逻辑器件）演变而来的,并将二者的特性结合在一起,使FPGA既有掩膜可编程门阵列的高逻辑密度和通用性,又有PLD的可编程特性。FPGA技术的发展使得单个芯片上集成的逻辑门数越来越多,能实现的功能越来越复杂。它以编程方便、集成度高、速度快等特点受到电子设计人员的青睐。人们可以通过硬件编程的方法设计和开发ASIC（专用集成电路）芯片,极大地提高了芯片的研制效率、降低了开发费用。通过应用FPGA技术,较好地为“某型雷达告警设备”的配套检测仪器实现了模…     

GEMNET: a generalized, shuffle-exchange-based, regular, scalable,modular, multihop, WDM lightwave network

GEMNET is a generalization of shuffle-exchange networks and it can represent a family of network structures (including ShuffleNet and de Bruijn graph) for an arbitrary number of nodes. GEMNET employs a regular interconnection graph with highly desirable properties such as small nodal degree, simple routing, small diameter, and growth capability (viz. scalability). GEMNET can serve as a logical (virtual), packet-switched, multihop topology which can be employed for constructing the next generation of lightwave networks using wavelength-division multiplexing (WDM). Various properties of GEMNET are studied     

Thermodynamics of copper matte converting: Part III. Steady-state volatilization of Au,Ag, Pb,Zn, Ni,Se, Te,Bi, Sb,and As from slag,matte, and metallic copper

A comprehensive compilation of various thermodynamic data required for a complete analysis of copper matte converting reactions is presented. The data comprise estimated free energies of formation for such gases as SeO, SeS, TeO, TeS, BiO, BiS, SbO, SbS, AsO, and AsS, as well as activity coefficients in dilute copper alloys and vapor pressures of various elements and compounds. The volatilization of minor elements in steady-state reactors comprising gas and several condensed phases is mathematically formulated, and a parameter which governs the volatilization in such reactors is defined and named volatilization constant. The vapor pressures of various volatile species are calculated thermodynamically for the Noranda Process reactor by assuming equilibrium conditions. The volatilization constants of various minor elements are expressed explicitly as functions of oxygen and sulfur activities. Formerly Associate Professor, Department of Metallurgical Engineering, University of Utah, Salt Lake City, UT     

Bits, symbols, bauds, and bandwidth

The use of clear, concise, and unambiguous language in telecommunications engineering is vital to communicate a desired meaning and understanding. Terminology should be based on rigorous engineering principles and traceable to well known and dependable sources. This article deals with four everyday terms commonly encountered in the popular semi-technical press as well as in serious engineering periodicals. The misuse of these and other terms can lead to low-balled cost proposals, court litigation, and patent infringement cases. Imagine how an engineering student can be confused when she/he typically encounters bandwidth measured in bits per second     

Novel planar, square-shaped, dielectric-waveguide, single-, and dual-mode filters

This paper presents a novel concept of a square-shaped dielectric-waveguide resonator, which can easily realize a dielectric-waveguide cross-coupled filter or a dielectric-waveguide dual-mode filter, using the conventional printed circuit board (PCB) process. This planar dielectric-waveguide resonator has a higher Q value than a microstrip resonator. The physical mechanisms of both single- and dual-mode filters are elucidated. Some new coupling structures are developed for undergoing the PCB process. Filter design procedures are detailed. Design curves for the coupling coefficients of internal- and external-coupling structures are determined by full-wave finite-element-method electromagnetic calculations. Measurement results are highly consistent with theory for all trial filters. This study offers an effective means of producing low-cost high-performance planar circuit filters.     

PBX技术.市态.营销.选购

本文介绍了ＰＢＸ交换机的技术及市场需求态势。并提出ＰＢＸ产品的营销要素及其用户在选购时应遵循的原则。     

Dilemmas,uncertainty, risks,and board performance

This paper traces the origins of the words risk, uncertainty, governance and development and argues that a deeper understanding of each allows more effective decision taking in the boardroom. It argues that the role of the board of directors is to balance and rebalance continuously their irresolvable dilemma — ‘how do we drive our enterprise forward while keeping it under prudent control?’ It argues that it is the board’s role to focus on uncertainty, rather than risk, and this requires a different set of intellectual skills from board members to be able to cope with monitoring a range of diverse scenarios. This is crucial for a board to develop stronger ways of both leading their organisation and of ensuring the connectedness of the learning within and between the board and the operational unit’s risk taking. It advocates that to achieve this a board must develop new ways of learning — especially of thinking strategically and becoming more sensitised to the dynamics of their changing external environments. This will take them well beyond the comforts of their specialist managerial disciplines and into the true world of directing. The paper demonstrates the importance of continuous learning in reducing organisational uncertainty and risk. It uses the ‘Learning Board’ process and model as the central processor of both strategic and operational learning to create an annual rhythm for the board’s year.