共查询到20条相似文献,搜索用时 140 毫秒
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提出了基于FPGA器件实现IPv4/IPv6地址协议转换网关的新方法.基于自顶向下的设计思想,采用原理图和VHDL语言相结合的设计方法,在单片FPGA器件上实现该系统.仿真和实验表明,该系统具有千兆线速转发、可扩展、低时延、系统片上集成等特点,在性能上比现有方案有大幅度提高. 相似文献
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介绍了应用可编程逻辑器件CPLD及硬件描述语言VHDL设计数字系统的方法,说明基于CPLD器件进行数字系统设计的特点、VHDL设计流程,重点介绍了在数字系统设计中,采用CPLD设计是一种基于芯片的、层次化、自顶向下的方法。以数字频率计设计为例,说明基于可编程逻辑器件的数字系统设计的方法。 相似文献
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王元华 《电气电子教学学报》2012,(5):52-54
本文将FPGA器件和DDS技术相结合,确定了FPGA器件的整体设计方案。笔者利用FPGA器件规模大、设计灵活方便的特点,分析研究了用FPGA器件实现DDS系统的方法,并对其关键技术进行了优化处理,采用流水线结构的相位累加器设计和FPGA内嵌的波形存储器设计,在Quartus II软件中采用基于硬件描述语言(VHDL)的自顶向下的设计方法来完成仿真实验。 相似文献
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基于CPLD的简易数字频率计的设计 总被引:2,自引:0,他引:2
CPLD器件的出现给现代电子设计带来了极大的方便和灵活性,使复杂的数字电子系统设计变为芯片级设计,同时还可以很方便地对设计进行在线修改。首先介绍了频率计的测频原理,然后利用CPLD芯片进行测频计数,从而实现了简易数字频率计的设计。此频率计的设计采用基于VHDL的"Top-Down"(自上而下)的设计方法,从系统总体要求出发,自上而下地逐步将设计内容细化,最后完成系统硬件的整体设计。所设计的电路在GW48系列SoPC/EDA实验箱上通过硬件仿真,下载到目标器件上运行,能够满足实际测量频率的要求。 相似文献
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VHDL语言的可综合性 总被引:2,自引:1,他引:1
采用VHDL语言输入,综合工具综合的自顶向下的设计方法是当前电子设计发展的趋势。但VHDL语言本身是基于仿真,而不是专为综合而设计的,许多VHDL语言结构在综合时将会引起一系列的问题。本文详细地分析了VHDL语言的可综合性问题。 相似文献
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频率合成器是电子设备的核心部件,其性能的优劣影响电子设备的整体性能。本文研究了一种基于锁相环(PLL)L波段的锁相频率技术。其设计方案使用MC145152来实现锁相环路,外加环路滤波器LPF和压控振荡器VCO等器件来实现,具有较强的研究设计价值。 相似文献
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A Low Computational-Cost Electronic Payment Scheme for Mobile Commerce with Large-Scale Mobile Users
The electronic transactions on wireless mobile networks, which are also called mobile commerce, become more and more popular
in recent years. In mobile commerce, the electronic payment is the most important component and thus many electronic payment
schemes for mobile commerce are proposed. However, these schemes need to maintain a large authentication table for a large
amount of mobile users. In addition, these schemes have heavy computation loads so they are not suitable for low computational-ability
mobile devices. To overcome the above drawbacks, we propose a low computation-cost electronic payment scheme for mobile commerce
in this paper. The proposed scheme can be applied to large-scale mobile user environments without maintaining a large authentication
table. Moreover, the proposed scheme has low computation loads for mobile users because the elliptic curve cryptography is
adopted in the proposed scheme. Therefore, the proposed scheme is more efficient and practical than the related works. 相似文献
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The routing problem in area array integrated circuit (IC) packaging has become an extremely complex problem in the realm of high I/O count IC packages. With the advent of flip-chip and ball grid array (BGA) technology to meet the current demands of smaller size and high wiring densities, the routing problem lies in the core of electronic design automation process. In this paper, we describe an intuitive computer visualization-based approach for placement and routing of bonding pads that would result in low manufacturing costs and smaller component size compared to conventional approaches. This novel approach is an extension of "balls shifted as needed" method for I/O ball placement in BGA package enabling single-layer board-level routing for any I/O count. The I/O ball/pad layout and routing designs along with results are presented for two routing layers with the inclusion of vias in the design. This routing scheme is shown to be easily extensible to accommodate more practical multilayer routing and can be incorporated in current electronic design automation (EDA) computer-aided design (CAD) tools to offer an integrated routing solution for area array chip-package-board codesign. The results show that different trace routing patterns lead to different area requirements for same number of I/Os. This has led to the formulation of new design paradigms which are presented in the paper for smaller component size. 相似文献
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S J D Phoenix 《BT Technology Journal》1997,15(2):45-62
The promise of tomorrow's electronic business environment will not be fully realised unless government, business and consumers have a high level of confidence in the security of that environment. The use of cryptography can provide this confidence and facilitate the establishment of a global electronic market-place. Cryptographic techniques offer a range of services including confidentiality, authenticity, integrity and anonymity. We examine some of these techniques and explain why a trusted third party infrastructure is seen as a crucial component in the successful introduction of an electronic business arena. The widespread use of cryptography, however, also presents possible new opportunities for criminal activity. To mitigate against this many governments have proposed the provision of escrowed cryptographic services — we review a particular scheme favoured by the UK government. 相似文献
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基于电子驱动器VK05CFL的CFL电子镇流器可以实现预热、灯寿终保护、灯存在检测和自动重启等功能。文中介绍了VK05CFL的引脚功能和内部结构,给出了用VK05CFL芯片设计高性能电子镇流器的几种实现方案。 相似文献
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详细介绍自项向下设计方法的同时,以某航管雷达天线骨架焊接工装的设计为例,逐步说明该方法的具体应用. 相似文献