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基于电路交换的NoC路由器设计与实现 总被引:2,自引:0,他引:2
片上网络(Network-on-Chip, NoC)以网络互连结构代替传统总线结构,很好地解决了片上高性能计算资源之间的通信瓶颈问题。路由器是实现NoC的重要基础部件,本文在分析国内外相关技术的基础上,面向无线通信等要求有保障服务的应用,设计并实现了一个基于电路交换的路由器。该路由器适合Mesh结构,提供5个输入输出端口,支持容量达48Gbit/s的交换,可以提供100%的无阻塞交换能力,并可配置为多播和广播方式。采用Verilog语言完成了所有设计工作,不仅进行了充分的仿真和验证,还使用Altera的FPGA实现了该设计,能够满足片内通信的需要。 相似文献
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基于软硬件协同的机群数据通信机制的研究与实现 总被引:2,自引:1,他引:1
针对各种机群互连网络中,由于软硬件协议之间缺乏紧密的配合,而导致网络提供给最终用户的通信效率较低这一问题。提出了基于硬件描述符机制的网卡设计方法和软硬件协同的思想,设计相应的机群通信协议。实现了高性能的机群互连网络,有效提高了机群用户的通信效率及机群互连网络的通信性能 相似文献
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未来网络体系结构创新和验证亟需建设虚拟化网络实验平台,虚拟路由器作为其中的核心组网设备,其结构和性能决定了实验平台的灵活性和承载能力.本文提出基于并行流水线的虚拟路由器数据平面结构,结合并行包分类和异步多指针轮询调度机制,在同一物理底层上实现了多个相互隔离的并行异构路由器.本设计在可编程硬件上进行了原型实现,并结合商用及软件路由器在真实的网络环境中部署、测试与实验.实验结果表明与传统单流水线结构相比,本设计能以更高灵活性和并行性支持异构的路由器实例独立运行;在逻辑资源开销和延时特性未显著增加的情况下,并行虚拟路由器可以达到与硬件可比的线速转发能力. 相似文献
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一种基于GCC的VLIW编译器指令调度算法 总被引:2,自引:2,他引:0
指令调度是编译优化过程中的重要技术。对于VLIW机器来讲,由于机器性能与编译器的设计和实现有很大的关系,指令调度就显得尤为重要。指令调度是在保证语义正确的前提下,改变指令执行的顺序,以提高指令级并行的程度。文章在一个DSP芯片C编译器上的工作基础上,介绍了一种行之有效的指令调度算法,并分析了算法的正确性。 相似文献
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王光 《微电子学与计算机》2014,(10)
提出了一种适用于IPv6路由器的快路径结构.采用NoC结构作为并行处理的基本通信设施,利用其可扩展性及高通信效率的特点,设计实现了包括预处理、输入队列、数据包处理和片上网络四部分的快路径结构,从而实现了分布式IP地址查找与并行IP包交换相融合的并行IP报文处理.测试表明该结构解决了IP路由查找方面的可扩展性差、查找延时大等瓶颈问题,而且在一个NoC结构之上同时实现了并行IP包交换,极大提高交换效率,节省硬件资源. 相似文献
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并行视频运动估计协处理器设计 总被引:2,自引:1,他引:1
本文重点研究通用视频处理器(VSP)中运动估计协处理器的设计。该设计提出了一种将常用的并行SIMD结构与流水线MISD结构相结合的新颖并行视频处理体系结构形式。协处理器中各个模块单独设计,经由指令调用来实现不同的算法。兼顾到不同格式视频序列的通用性以及灵活性等要求,协处理器可以同时激活最多8个同类模块并行协同工作以实现对不同格式图像块的处理。该设计结构非常简单,易于实现。目前,已经通过VSP芯片整体的指令级与功能级仿真与验证。结果表明,当系统时钟为80MHz时,运动估计协处理器与VSP的其它功能部件及指令部件可以有机协调地工作。 相似文献
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由于专用网络各个本地子网(LAN)之间的互连涉及远距离通信,一般通过公共传输系统实现互连,通常由提供物理连接的公共传输系统(如PSTN,ISDN,DDN)或提供链路层链接的公共传输系统(如ATM,帧中继)实现LAN之间的互连,随着公共数据网络的发展,通过公共数据网络(如Internet)实现企业网各个LAN之间的远距离互连变得日益普及。当IP交换技术成为IP骨干路由器的主流技术后,IP主干网通常已经成为IP交换网络,基于MPLS的VPN构建技术已日益成为最主流的技术,本通过对各种专用网络互连技术的描述和比较,给出了他们的性能优势。 相似文献
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基于数据流的指令调度器的设计与实现 总被引:1,自引:0,他引:1
文中设计并实现了一个基于数据流的汇编代码CPU指令调度器.该CPU指令调度器基于中国科学院微电子研究所自行研发的Diamond处理器VLIW体系结构,将串行程序流进行重排序从而实现指令的并行发射执行.实验结果表明,通过指令调度器后可显著提高程序的性能. 相似文献
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Michael Reilly 《半导体技术》2004,29(12)
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
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Thomas M.Trexler 《半导体技术》2004,29(5)
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
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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
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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
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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
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Qi-jiang Ran Pei-de Han Yu-jun Quan Li-peng Gao Fan-ping Zeng Chun-hua Zhao 《光电子快报》2008,4(4):239-242
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
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It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output(MIMO) communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory. 相似文献
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Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers
A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it. 相似文献
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A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working. 相似文献
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《中国通信》2014,(7)
正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks 相似文献