共查询到20条相似文献,搜索用时 419 毫秒
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文章提出了一种60 Gbit/s宽带电路交换专用集成电路(ASIC)芯片的设计实现方案.针对设计芯片速度快、规模大和功耗大等特点,给出了采用流水线设计思想和优化结构处理技术的电路设计解决方案.同时还给出了采用现场可编程门阵列(FPGA)芯片对设计电路进行功能验证的结果和ASIC流片的基本数据. 相似文献
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随着网络功能的不断扩展,新型网络协议的不断涌现,这些协议中的数据包具有新的格式定义,需要网络设备能够支持相应的解析和查找。软件定义网络(Software Defined Networking, SDN)基于流表的转发设计使得网络的创新变得简单,但是仍然难以支持任意协议的可编程解析和处理。该文联合考虑数据包的解析和查找过程,提出一种支持协议弹性定制的数据包查找硬件结构,通过比特粒度的解析和基于元操作的查找过程,使得任意协议能够在硬件结构上得到处理;此外,该文针对所提硬件结构提出一种基于多叉树的映射算法,将用户定制协议映射到硬件处理流水线和查找表中。通过实际的FPGA部署验证了所提结构能够支持多种协议的灵活定制,在硬件中的处理速度可以达到390 Gbps,与已有方案相比,其硬件资源利用率有明显降低。该结构对未来的软件定义网络的数据平面设计有重要的意义。 相似文献
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在分析IEEE 802.1Q协议的基础上,研究了千兆以太网媒体接入控制器(Media Access Control,MAC)中虚拟局域网(Virtual Local Area Network,VLAN)的实现方法,详细介绍了系统接收数据包与发送数据包的详细工作流程。结合各种VLAN划分策略的特点,分析了采用VLAN技术解决实际应用中需要区分不同帧格式的特殊需求。基于Altera FPGA设计了一种千兆全双工以太网MAC,实现了千兆以太网VLAN数据帧的收发,并对不同类型的帧进行了区分。通过现场可编程门阵列(FieldProgrammable Gate Array,FPGA)验证表明,设计能够完成千兆以太网VLAN数据帧的收发、区分功能,满足设计要求。 相似文献
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随着新协议的不断涌现和网络速率的迅猛增长,报文解析结构在解析灵活度和解析速率上面临挑战。该文结合流水线设计和二叉trie树查表思想,提出一种应用于路由转发的报文协议解析结构(Parsing PipelineArchitecture for Forwarding,PPAF),通过构建协议二叉trie树来支持报文协议解析的灵活度,利用硬件多级流水查表提升报文协议解析处理速率,采用节点映射算法解决协议二叉trie树节点到流水线映射过程中存储资源不均衡的问题。基于NetFPGA平台的仿真结果表明,相对于现有的高速解析结构,PPAF在处理速率和资源占用上取得较好的均衡的同时,能够提供基于接口的独立灵活解析能力。 相似文献
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雾霾使光照条件恶劣,导致采集的视频图像失真.为了解决这个问题,本文采用Altera公司的Cyclone IV系列现场可编程门阵列(Field-Programmable Gate Array,FPGA)芯片作为核心,设计了支持多种分辨率的图像高速去雾实时系统.通过RAM的乒乓操作缓存高速数据流,并利用流水线处理的优势实现了限制对比度自适应直方图均衡化(Contrast Limit-ed Adaptive His-togram Equalization,CLAHE)算法的流程.实验结果表明,该系统能处理高达75 帧/秒的视频图像,具有良好的实时去雾功能. 相似文献
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高能效温度传感器在物联网(Internet of thing,IoT)系统中有着极为广泛的应用.提出了一种基于流水线型时间-数字转换器(Time-to-digital converter,TDC)的时域温度传感器,该温度传感器中的TDC电路采用了一种具有高线性度的可编程时间放大器(Programmable-gain t... 相似文献
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针对多源、复杂视频处理存在的实时性低,资源占用率高的问题,提出了一种基于软件流水线并行处理多源视频的方法,具有降低视频处理应用的设计难度,优化计算资源使用,提高复杂算法多源视频处理的实时性的特点.首先基于多核CPU构建多任务管理系统,用于任务缓存及调度,并管理资源负载,在此基础上设计软件流水线.软件流水线的每一个stage将对于一帧视频图像的处理封装成任务的形式提交给多任务管理系统调度执行.最后,将软件流水线用于多源视频处理,并行处理6路视频,试验结果表明该方法能够有效提升多源、复杂视频处理的实时性,且在资源利用率,负载均衡等方面具有良好特性. 相似文献
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Existing IP routing algorithms have been developed mainly for non‐VLAN networks. For these routing algorithms to work, an end station must be attached to its associated network. The introduction of VLAN has, however, allowed the physical location of the end station to be changed from time to time. Therefore, some extra mechanism is required to support routing in VLAN environment. Existing approaches have some drawbacks in terms of inefficiency in traffic forwarding and switch software complexity. In this paper, a simple and efficient method for routing over IP subnet VLAN in Ethernet is proposed. This method has been implemented in hardware and found to work correctly. Various measurements and analyses have been performed to verify the efficiency of this protocol. Copyright © 2002 John Wiley & Sons, Ltd. 相似文献
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Shadrokh Samavi Shahram Shirani Nader Karimi M. Jamal Deen 《The Journal of VLSI Signal Processing》2004,38(3):287-297
In this paper we present a pipeline architecture specifically designed for processing of DNA microarray images. Many of the pixilated image generation methods produce one row of the image at a time. This property is fully exploited by a pipeline which takes in one row of the produced image at each clock pulse and performs the necessary image processing steps on it. This will remove the present need for sluggish software routines that are considered a major bottleneck in the microarray technology. The size of the proposed structure is a function of the width of the image and not its length. The proposed architecture is proved to be highly modular, scalable and suited for a Standard Cell VLSI implementation. 相似文献
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随着信息点的增多,为了控制广播风暴和提高网络的安全性,提出一种计算机实验教学示范中心网络VLAN的实现方法.首先,对VLAN的概念和特点进行了详细介绍,根据实际情况设计了网络拓扑结构图.其次,探讨了实现VLAN的方式,根据实际需要对各VLAN的IP地址进行了分配,以实例介绍了利用VLAN设计的详细过程,并在交换机上使用... 相似文献
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Real-time processing and compression of DNA microarray images. 总被引:1,自引:0,他引:1
Shadrokh Samavi Shahram Shirani Nader Karimi 《IEEE transactions on image processing》2006,15(3):754-766
In this paper, we present a pipeline architecture specifically designed to process and compress DNA microarray images. Many of the pixilated image generation methods produce one row of the image at a time. This property is fully exploited by the proposed pipeline that takes in one row of the produced image at each clock pulse and performs the necessary image processing steps on it. This will remove the present need for sluggish software routines that are considered a major bottleneck in the microarray technology. Moreover, two different structures are proposed for compressing DNA microarray images. The proposed architecture is proved to be highly modular, scalable, and suited for a standard cell VLSI implementation. 相似文献
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Bakshi S. Gajski D.D. 《Very Large Scale Integration (VLSI) Systems, IEEE Transactions on》1999,7(4):419-432
In order to satisfy cost and performance requirements, digital signal processing and telecommunication systems are generally implemented with a combination of different components, from custom-designed chips to off-the-shelf processors. These components vary in their area, performance, programmability and so on, and the system functionality is partitioned amongst the components to best utilize this tradeoff. However, for performance critical designs, it is not sufficient to only implement the critical sections as custom-designed high-performance hardware, but it is also necessary to pipeline the system at several levels of granularity. We present a design flow and an algorithm to first allocate software and hardware components, and then partition and pipeline a throughput-constrained specification amongst the selected components. This is performed to best satisfy the throughput constraint at minimal application-specific integrated-circuit cost. Our ability to incorporate partitioning with pipelining at several levels of granularity enables us to attain high throughput designs, and also distinguishes this paper from previously proposed hardware/software partitioning algorithms 相似文献
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基于Hybrid Port的VLAN实现 总被引:1,自引:0,他引:1
VLAN具有控制网络广播风暴、保障网络安全和简化网络管理等特点,因此在局域网中得到广泛的应用。在某些场合下必须允许特定VLAN之间相互访问,通常实现方式是划分IP子网并通过IP进行路由。但是在某些特定的场合中,由于IP紧缺以及保障IP真实等原因,不能采取这样的方案。为此本文提出了一种基于混杂端口(hybrid port)的虚拟局域网(VLAN)实现方案。通过这种方式设计,在提高网络安全性的同时,避免了IP地址紧缺的问题。最后给出了基于混杂端口VLAN设计方案。 相似文献