伺服控制系统的DM9000A以太网接口设计

采用以太网控制器DM9000A,实现DSP+FPGA伺服控制系统的100M以太网接入.介绍了DM9000A的功能原理,给出了该器件与TMS320F2812 DSP的硬件连接方法、软件初始化及数据收发控制流程.     

基于ARM9的嵌入式网络语音终端系统设计

以网络语音通话系统为背景,提出一种采用S3C2440微处理器实现网络语音通信功能的方案。该设计结合DM9000CEP以太网控制芯片实现以太网通信功能,使用UDA1341TS音频编码器完成语音信号的A/D、D/A转换。该方案构建的嵌入式VoIP网络电话具有可靠性高、操作性强与可扩展性高等特点。     

基于S3C2440A的嵌入式电力网络仪表设计

介绍了以三星公司的一款ARM920T内核的嵌入式微处理器S3C2440A为核心,以嵌入式Windows CE为操作系统的电力网络仪表的设计与实现,给出了系统整体结构框图、系统各组成模块的功能以及软件流程图;选用高性能的以太网接口芯片DM9000E设计了网络的物理层接口电路,通过移植DM9000E驱动到Windows CE操作系统从而实现仪表和远程PC机的网络通信,软件部分重点介绍了A/D采样流接口驱动程序的设计和处理采样数据的方法;实验结果证实该仪表能够满足实际工程的要求,达到了预期设计目标。     

低成本网络数据传输存储系统的FPGA实现

三维LED显示阵列显示一帧立体图像需要很大的图像数据,针对它的数据可靠传输的问题,提出了一种一对多远程网络数据传输存储系统的具体连接和实现方案.该方案应用了现场可编程门阵列(FPGA)以及Verilog HDL编程技术,结合了Intel 28FJ3A系列Flash芯片和DM9000A以太网控制芯片,实现了立体图像的同步显示和储存,网络传输速度可以达到100Mbps,具有低成本、低功耗、高速率等特点.     

数字电视机顶盒的以太网接入设计与实现

为了满足家庭用户对于交互式多媒体数字电视业务的需求,设计与实现了在数字电视机顶盒上接入以太网的功能;硬件设计部分以嵌入式高速以太网接口芯片DM9000A为核心,在数字电视机顶盒硬件平台上从外围电路连接、地址空间等方面进行了设计研究;软件设计部分包括软件流程、DM9000A驱动程序的实现、LwIP协议接口设计以及应用层软件的设计。提出了系统测试方案,通过对整个数字电视机顶盒以太网接入系统功能测试结果表明,UDP传输速度可以达到20Mbps左右,接口时序的正确性达到90%以上,系统的性能稳定性强,达到了设计要求,整个系统的运行效果理想,应用前景广泛。     

嵌入式linux下DM9000网卡驱动的移植与实现

基于DM9000以太网控制器芯片对Xscale pxa 270开发板硬件平台的网络接口进行了设计,对DM9000在移植过程中出现的问题和解决的具体办法进行了描述。实现了嵌入式Linux系统下dm9000的移植。测试结果表明网口运行正常,达到了功能要求。     

面向LwIP的Nios Ⅱ网络驱动程序开发

本文介绍了以DM9000AE作为网络控制器的嵌入式系统以太网通信功能的实现方法.系统设计采用DE2作为开发平台.该系统基于Nios Ⅱ软核处理器,以太网控制器使用DM9000AE;运行μC/OS-Ⅱ操作系统,加载网络协议LwIP.本文研究DM9000AE的初始化、数据包收发的软件编程算法,重点分析LwIP的网络接口驱动层设计.开发了DM9000AE在LwIP下的驱动程序,完成LwIP在DM9000AE芯片上的移植.最后,通过开发通信软件来测试系统的通信功能.     

无线传感器网络汇聚节点LAN接口设计与实现

分析了无线传感器网络汇聚节点的通信功能需求,设计了基于PXA310核心处理器及10M/100M自适应DM9000以太网控制芯片的LAN接口硬件方案,满足了无线传感器网络汇聚节点数据可靠性传输的以太网通信结构;然后研究了在Linux平台下网络驱动程序的体系架构以及数据包的发送接收过程,并实现了基于设计的硬件平台汇聚节点以太网的驱动程序开发和具体的移植过程,实现嵌入式系统和设计的以太网硬件平台通讯功能;经实际应用表明设计汇聚节点的LAN接口能快速稳定传输数据。     

TMS320C6713与DM9000A的接口设计与实现

采用DAVICOM公司的以太网控制芯片和,TI公司的TMS320C6713设计了网络通信电路.该设计适用于各种嵌入式设备以及各种信号处理设备中.为各种设备之间的通信提供解决方案.给出了TMS320C6713和DM9000A的接口电路和软件编程实现.     

嵌入式操作系统的网络启动

本文给出了以太网控制芯片驱动程序的数据传输和数据接收两个主要功能模块的实现。论文在基于BF533＋DM9000AE的嵌入式系统上，对U-Boot中DM9000AE驱动程序进行了移植，并给出了TFTP服务器与目标机的相关设置以及实际操作过程中的一些经验和建议。     

基于功能本体的设计知识共享平台

为弥补制造业中设计知识在共享和重用方面的缺陷,提出一种基于功能本体的设计知识共享策略。使用功能本体实现现有产品结构到其功能的映射,利用功能分解树表达产品的设计原理。首先,介绍了功能本体的基本框架;然后,分析了功能分解树在产品设计中的作用;最后,通过实现一个家电领域设计知识共享平台,验证所提出的共享策略的可行性。实验结果表明,该策略能有效实现制造业设计知识的信息检索、共享和重用,可以缩短产品的开发周期。     

基于可满足性无关项的硬件木马设计与检测

硬件木马是集成电路中隐含的恶意设计修改,被激活后可用于发起高效的底层攻击.由此,展示了一种新的利用可满足性无关项的轻量级高隐蔽性硬件木马安全威胁.该木马设计方法将轻量级木马设计隐藏于电路正常工作条件下无法覆盖到的可满足性无关项中,使插入木马后的电路设计与原始设计完全功能等价.攻击者只需利用简单的故障注入攻击手段即可激活...     

A formal approach to managing design processes

To capture market opportunities, competition within the microelectronics industry demands ever-faster product development, which means ever-shorter design cycles. Shorter design cycles can be achieved by carefully managing the design process during rapid prototyping. Careful management is important because the design process must be (1) adjusted to accommodate constraints such as product performance and design time, and (2) frequently updated to take advantage of new design tools and methodologies. Traditionally, designers have used whatever tools seemed convenient to them at the time, which has made it virtually impossible to determine what methodology was used to produce a given design. These problems can be avoided through design methodology management, which ensures that appropriate tools are selected and executed in the appropriate sequence. Effective design management requires an environment equipped with a formal representation of supported design processes and tools, and an execution environment that helps designers select and execute an appropriate design process. We propose a methodology management system that provides this functionality     

Fault tolerant network design inspired by Physarum polycephalum

Physarum polycephalum, a true slime mould, is a primitive, unicellular organism that creates networks to transport nutrients while foraging. The design of these natural networks proved to be advanced, e.g. the slime mould was able to find the shortest path through a maze. The underlying principles of this design have been mathematically modelled in literature. As in real life the slime mould can design fault tolerant networks, its principles can be applied to the design of man-made networks. In this paper, an existing model and algorithm are adapted and extended with stimulation and migration mechanisms which encourage formation of alternative paths, optimize edge positioning and allow for automated design. The extended model can then be used to better design fault tolerant networks. The extended algorithm is applied to several national and international network configurations. Results show that the extensions allow the model to capture the fault tolerance requirements more accurately. The resulting extended algorithm overcomes weaknesses in geometric graph design and can be used to design fault tolerant networks such as telecommunication networks with varying fault tolerance requirements.     

Development of a semantic product modeling system for initial hull structure in shipbuilding

In the initial stage of ship design, designers represent geometry, arrangement, and dimension of hull structures, which correspond to product model information, with 2D geometric primitives such as points, lines, arcs, and drawing symbols on 2D drawings. However, designers must translate the product model information defined on the 2D drawings more intelligently in the following design stages. Thus, design semantics could be lost and design processes that follow could be delayed because of errors by mistranslating the information. Here, design semantics mean design intents of the designer, that is, functions and structures which the product must have.In this study, a semantic product model data structure of an initial ship hull structure was proposed, and a semantic product modeling system was developed based on the proposed data structure. The proposed data structure can store semantic product model information such as product design results with the use of 2D wire frame geometrical data, part attributes, and design knowledge. Hence, this information can be used to generate a 3D solid model and production material information for CAPP as needed.The applicability of the proposed data structure and the developed system was verified by applying them to the deadweight 300,000 ton of Very Large Crude oil Carrier’s product modeling procedure. The application results showed that the proposed data structure and the developed system can be efficiently used for overall initial ship design environment.     

3D input for CAAD systems

It is often acknowledged that the main advantage of computer aided architectural design (CAAD) systems is that they can be used by architects to quickly and accurately evaluate alternative design solutions using a variety of performance measures which would be too time consuming to apply by hand calculation.To gain the full advantage of interactive CAAD requires the architect to use a computer terminal with graphic capabilities so that he can create and modify his design geometry in a form which can also be directly interpreted by the evaluate routines within the CAAD system. However, it is suggested that it is often difficult for the user of such conventional, graphic, CAAD systems to conceptualise the building being designed by only inspecting and manipulating drawings displayed on the terminal screen.This problem may be accentuated when building users who are not professional architects wish to use a CAAD system so as to participate in the design process.A computerised building block system (BBS) is proposed with which the designer can physically build a model of his design as he would if he was using ‘Lego’¹ blocks. Such a physical representation may allow him to evaluate many of the visual and spatial qualities of his design in a more direct way than could be achieved using computer graphics. However, because the electronic system can ‘read’ the arrangement of blocks and input this information into a computer, the user's design can be evaluated with the same performance measures that are used in existing CAAD systems.     

Design optimization using signal-to-noise ratio

This paper shows how design optimization can be achieved using signal-to-noise (S/N) ratios. A case of maintenance float policy is used to illustrate the application presented here. Basically, this involves the implementation of a robust design plan in simulation analysis. The design plan is based on the use of orthogonal arrays introduced by Taguchi. Through the application of Taguchi's S/N ratio, we demonstrate that the best design plan from an experimental design can be determined. This has several implications: (1) It reduces the experimentation time, (2) it can identify a fractional design that contains the best design plan and that design plan could be studied for full experimentation, (3) within a subset of a fractional design plan, the best design point can be found, and (4) the cost of experimentation is significantly reduced since minimal number of runs is required to identify the best design point. Finally, this important result helps experimenters to select a fractional design plan that contains the “best design point”.     

A new approach for anthropometric design applied to a blast cabin

Common anthropometric design methods require extensive experimentation in order to determine the final design. Even with the help of technical supports this procedure is very lengthy since it requires numerous test cycles in order to create a design which meets all requirements. In addition, it is difficult to determine an objective evaluation scale for the comparison of different designs.

The method described in this paper is based on a completely different strategy that permits designing an object analytically by means of a simple algorithm. In ‘free-style’ experiments the body position movements of real persons can be interpreted as most favourable under certain conditions. The measurement of these parameters and subsequent mathematical processing leads directly to the final design without further experimentation. Consequently even complex objects can be designed in a single cycle.

The method was developed for the redesign of a blast cabin. It was possible to design a cabin with fixed dimensions that can be operated without problems by people of almost all heights, either in a standing or a sitting position. It could be shown that most dimensions did not necessarily correspond to body height.     

Hybrid variable damping control: design,simulation, and optimization

This paper presents the design, formulation, and performance optimization of a new hybrid electromagnetic damper in response to the demand for a tunable, regenerative and fail-safe damping device for various applications. Damping in a multitude of engineering applications has a variable threshold requirement based on system excitation. Since system excitation is also variable; dampers are such that an adequate amount of damping is provided, opposed to an optimal amount as a function of excitation. In this research it was shown that, by implementing a hybrid damper design based on a bias component provided through a hydraulic medium and a variable component provided by electromagnetics, an optimal damping quantity can be obtained for a given excitation. The produced damping force and electrical power were formulated based on the structure’s geometry and input displacement. The presented design was optimized for a scooter scaled application and it was shown that the damping and regenerative characteristics can be adjusted for different requirements. Furthermore, it was illustrated that this design has the potential to be scaled for other applications as well.     

食品流体连续灭菌的设计

当前有两种简化的原则,可用于食品连续灭菌的设计。其一,假设所有流体都以管道中心的最大速度流动,并以之作为设计保持管长度的依据。其二,根据停留时间的平均值,以计算灭菌度,从而求出保持管的长度。本文采用这些简化的设计原则,针对拟塑性幂律型食品流体,提出食品连续灭菌设计的计算公式,用于幂律型非牛顿食品流体连续灭菌的工业设计。