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1.
为保护电子设备中使用的静态随机存储器(SRAM)型现场可编程门阵列(FPGA)内部电路设计不被窃取,设计了用于SRAM FPGA的防克隆电路.该电路利用FPGA制造过程中的随机误差,提取每块芯片独一无二的ID.在此ID的控制下,被保护电路只能在指定的FPGA中正常运行,而在未指定的FPGA中运行时,无法产生正确的输出,从而达到防克隆目的.防克隆电路由使用仲裁器的物理不可克隆函数(PUF)、多数表决器、运算门阵列等三部分构成,其中仲裁器PUF电路用于提取ID,多数表决器起到提高输出稳定性的作用.最后在FPGA开发平台上证明了该电路的可行性.  相似文献   

2.
利用65 nm CMOS制造工艺下的随机掺杂涨落(RDF)模型,建立起随机路径延时模型,通过修改台积电(TSMC) 65 nm低k电介质工艺器件模型库参数,完成了仲裁器型PUF电路的设计和评估.实验在Synopsys Hspice C-2010模拟设计平台上完成,测量了PUF电路的片间差异和片内差异参数,评估了128位PUF电路的性能.与实测电路参数的对比结果证明了该方法的有效性.  相似文献   

3.
王韬  余宁梅  刘阳美  李勇   《电子器件》2007,30(6):2125-2128
为了实现异步时钟域之间数据高速、稳定的传输,文章设计了一个基于FPGA的异步FIFO.采用格雷码作为地址编码,引入虚拟地址页来产生标志位.并用Verilog HDL语言描述了深度为16的异步FIFO,在ALTERA的Cyclone系列FP-GA上对电路进行了验证.根据逻辑分析仪观测的结果可知,设计的异步FIFO可以稳定工作在100MHz时钟,达到了高速电路的设计要求.最后对设计进行了最坏情况的理论分析,证明了设计很好地避免了亚稳态问题.  相似文献   

4.
杨哲  张萍  马佩军  李康  史江一 《电子器件》2011,34(3):307-311
设计了一款针对XDNP系统的总线仲裁器.该仲裁器是基于动态混合优先级算法而设计的.依据主设备访问不同从设备的任务,调整自身的优先级,极大提高了总线系统的传输效率.该总线仲裁器采用自顶向下的设计方法,采用Crossbar Switch(纵横交换)和共享总线相结合的连接方式.与其他两种仲裁器(循环优先级仲裁器和静态混合优先...  相似文献   

5.
张晖  宋其丰  王志功 《电子器件》2004,27(4):611-617
文中比较了串行、并行、树型结构分接器的特点,介绍了分接器的关键电路的结构和设计考虑,并给出了仿真结果.采用伪静态逻辑和树型结构设计的分接器在2.5 V电源电压下,工作速率达到2.5 Gb/s,平均功耗281 mW,面积1.56 mm×1.86 mm.  相似文献   

6.
SpaceWire路由器动态加权轮询仲裁器的设计与实现   总被引:1,自引:0,他引:1  
研究了SpaceWire路由器中使用的仲裁机制,提出了一种动态加权轮询仲裁算法,并且依据这一算法设计了仲裁器模块.动态加权轮询仲裁算法是基于优先级算法和轮询算法混合的仲裁策略,它的特点是避免了优先级算法中,高优先级的端口在提出数据转发请求后独占输出端口的情况,同时也解决了轮询算法中各个端口获取服务的权重过于平均的问题,路由器可以根据与之连接的不同有效载荷的性能要求,分配基础权重,具有较高实时性要求的有效载荷能及时转发数据,降低延迟时间.最后介绍了仲裁器模块的设计与实现.  相似文献   

7.
异步复位设计中的亚稳态问题及其解决方案   总被引:3,自引:0,他引:3       下载免费PDF全文
田志明  杨军  罗岚 《电子器件》2002,25(4):435-439
尽管异步复位是一种安全可靠复位电路的方法,但如果处理不当的话,异步复位释放可能会导致亚稳态(metastability)的问题。本文分析了这个问题产生的原因和后果,给出了一种可能的解决方案。在设计中加入复位同步器逻辑和复位分配缓冲树。这种方法综合了同步复位设计与异步复位设计的优点,解决了异步复位设计中的亚稳态问题。  相似文献   

8.
文中比较了串行、并行、树型结构分接器的特点 ,介绍了分接器的关键电路的结构和设计考虑 ,并给出了仿真结果。采用伪静态逻辑和树型结构设计的分接器在 2 .5 V电源电压下 ,工作速率达到 2 .5 Gb/s,平均功耗 2 81 m W,面积1 .5 6mm× 1 .86mm。  相似文献   

9.
以往异步电路在FPGA上的设计验证采用HDL设计的Muller门搭建电路,在实现时需要手动布局布线来完成时序约束,设计繁琐复杂.对此完善了异步电路设计平台Balsa与FPGA设计工具相结合的设计验证流程,采用四相双轨延迟不敏感的握手协议,避免了手动布局布线的繁琐步骤.同时,在不同FPGA平台间具有良好的可移植性.重点设计了遵循异步握手协议的输入电路,完成了行为级到板级的全流程设计及验证.  相似文献   

10.
随着自动化技术的迅速发展,永磁同步电机在工业生产实践中起着越来越重要的作用.针对传统PID控制策略难以兼容系统响应速度和鲁棒性的问题,文中以表贴式永磁同步电机为控制对象,分别从硬件、软件设计出发,设计了基于STM32控制器的永磁同步电机控制系统.该系统的硬件部分主要涉及开关电源电路、主控电路及检测电路设计;软件开发部分...  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
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.  相似文献   

14.
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.  相似文献   

15.
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.  相似文献   

16.
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.  相似文献   

17.
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.  相似文献   

18.
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.  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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