基于FPGA和Matlab的IP核设计方法

为了简化IP核的设计过程,本文介绍了一种基于FPGA的中值滤波算法的IP核实现方法.针对FPGA 的特点对实现方法进行了研究,从而简化了复杂算法的IP核设计问题.实验结果表明,该IP核设计方法具有设计周期短,可靠性高等特点.     

以太网MAC层IP软核设计方法研究

主要论述了在SOC产品开发中如何设计以太网MAC层IP软核.针对目前以太网MAC层IP软核设计的实际情况,分析了三种常用的IP软核设计方法的优缺点,提出了一种改进的U型IP软核设计方法.并运用此方法先对以太网MAC层IP软核进行层次化的自顶而下设计,再对其进行自底而上地实现与集成,最后得到该IP软核整体.经过对该软核的测试与结果分析,验证了其能够实现以太网MAC层协议功能,达到了设计目标.该研究将对今后的以太网MAC层IP软核及相关产品开发具有重要的参考价值.     

IP核网络管理系统的设计及实现

目前,基于IP核复用的SOC技术已经发展成为IC设计的一种主流技术,而SOC设计的关键是可复用IP核的获取.IP核网络管理系统可以有效的组织和管理IP核数据,并且为用户查找、选择合适的IP核提供一个便利的公共平台.文章主要分析了IP核数据的特点,从而确立了IP核的数据结构;并且详细讨论了IP核网络管理系统的设计考虑与实现过程.     

一种16位定点式DSP核的设计及Modelsim仿真验证

为提高DSP的工作效率,设计了一种4级流水线的16位定点式DSP核.分别从系统及关键模块设计两个方面,介绍了DSP核的具体设计方法,着重分析了流水线的实现方案及DSP核的指令流与数据流,给出了DSP核的完整设计方案.最后给出DSP核支持的指令集,并基于Modelsim仿真环境对指令集进行验证.结果表明,该DSP核能够正确执行各条指令,最高时钟频率为12.5MHz,可在单个机器周期内完成高速运算.     

DVB通用解扰算法的高性能IP核设计

提出了DVB通用解扰算法高性能IP核设计、验证和测试的方法,着重描述了IP核的可重用设计,使本IP核与多种总线能互连.整个设计采用VHDL语言设计,在Altera的FPGA和富士通CE66库上进行了综合和验证.最终在富士通CE66库上实现的IP核最高时钟频率为212.8MHz,数据率可以达到1.7024Gbps.     

一种多通道ARINC429总线协议IP核的设计与实现

设计了基于FPGA的ARINC429总线协议IP核.给出了IP核的总体设计及工作原理.在设计时采用功能模块的方法,分别设计数据协议处理模块、缓冲模块、定时模块等部分.充分利用同步时钟方法,提高了可靠性,有效解决了数据间干扰和亚稳态问题.经验证表明IP核的功能符合设计要求.最后经过物理验证,能够正确实现收发功能,且满足特定场合的应用.     

基于SOPC的列车通信网卡的设计

本文介绍了MVB总线帧结构,并完成了用于网络连接的MVB总线访问IP核的设计.基于SOPC的设计思想,本文通过Quarters Ⅱ软件平台的SOPC Builder设计工具,集成NiosⅡ软核处理器与总线访问IP核,实现了满足MVB协议的Ⅰ类网卡设计.     

基于VerilogHDL的IP核参数化设计

指出了IP核参数化设计的重要性,分析了IP核的参数类型及相互关系.在分析基于VerilogHDL的IP核参数化设计方法及所面临困难的基础上,提出了一种附加的编译预处理方法并设计了相应的工具软件ECP.IP核由VerilogHDL和ECP扩展的语句混合编程,经ECP处理后生成VerilogHDL源文件.应用该方法后,提高了Ver-ilogHDL在描述功能、性能、结构及优化策略等参数化的复杂模型时所需要的灵活性,增强了VerilogHDL的建模能力.作为一个IP核参数化设计的实例,介绍了C*Core系统中断控制IP的参数化设计过程,给出了FPGA验证的结果.     

SOC设计中的IP挑战

IC设计正逐渐转向系统级芯片(SOC)设计,IP核是其中的重要核心部分.本文介绍了IP核的概念及交付形式,讨论了IP核相关标准、IP验证、IP的质量评估,以及知识产权的保护,并从上述几个方面分析了IP核所面临的挑战.     

可配置的TFT-LCD控制器IP核的设计

设计实现了一种基于Avalon总线的,显示分辨率和像素深度均可配置的TFT-LCD控制器IP核.根据自顶向下的设计思想,将IP 核进行层次功能划分设计,采用Verilog 硬件描述语言实现该控制器以及它的外围逻辑时序的全部功能.并对IP 核进行仿真验证,最后加入到Nios II系统中,该IP 核经测试效果良好.     

微流控液体变焦透镜内芯结构的电场仿真

主要研究了圆台型内芯的液体变焦透镜的电场分布。通过使用COMSOL软件（多物理场分析软件）建立相应模型,改变圆台内芯结构的角度、电压和圆台半径等参数来观察其内芯中的电场分布情况。根据仿真结果对比于圆柱内芯结构（即圆台型结构的角度为零）,圆台型结构更符合实际应用的要求。     

Optical Waveguide Films With Two-Layer Skirt-Type Core Structures for Beam Leakage/Scattering Reduction at Tapered Mirrors

Using the self-organized lightwave network (SOLNET) technique, we observed guided beam leakage and scattering at tapered mirrors of core end facets in optical waveguide Alms. The leakage/scattering are caused by the tunneling of guided beams into the cladding film and pattern imperfection of core edge corners. To reduce them, we proposed the two-layer skirt-type core structure, where a core has a layered structure of low-index (LI) part and high-index (HI) part. The LI part located between the HI part and the cladding film prevents guided beams from tunneling into the cladding film. The skirt-type shape of core end facets puts core edge corners away from the guided beam paths. The beam propagation method and the finite-difference time-domain method revealed that the leakage/scattering are reduced in the proposed core structure. Optical waveguide films with the two-layer skirt-type core structure were fabricated by the built-in mask method. Appropriate skirt lengths were found to be around core widths. Guided beams were confined into the HI part to reduce the tunneling into the cladding film.     

Modal cutoff in rare-earth-doped photonic crystal fibers with multi-layer air-holes missing in the core

The various mode effective indices of the doped photonic crystal fibers (PCFs) are compared, the mode field distributions of the fundamental mode and the second-order mode are analyzed, and the single-mode condition is presented. The mode effective indices of large-core doped PCFs with different core indices and structure parameters are simulated by the finite element method (FEM). The relations of the core index with the fiber structure parameters of pitch, hole-to-pitch ratio and core diameter are obtained for single-mode propagation. In the design and fabrication of the doped PCF, we can adjust the core index and fiber structure parameters to achieve large mode area and single-mode propagation.     

Synthesis and photoluminescent properties of ZnO:Cu/ZnO core/shell nanocrystals

ZnO:Cu/ZnO core/shell nanocrystals are synthesized by a two-step solution-phase process. The morphology, structure and optical properties of the samples are detected by scanning electron microscopy, Raman, absorption and luminescence spectroscopy. The increase of particle size confirms the growth of ZnO shell. The segregation of CuO phase observed in ZnO: Cu core is not detected in ZnO:Cu/ZnO core/shell nanocrystals from Raman spectra. It is suggested that some Cu ions can be segregated from ZnO nanocrystals, and the separated Cu ions can be incorporated inside ZnO shell after the growth of ZnO shell. The visible emission mechanism is discussed in detail, and the photoluminescence analysis indicates that the core/shell structure helps to eliminate the surface-related emission.     

Honeycomb photonic bandgap fiber with a modified core design

Air-silica honeycomb fiber with a modified core design is introduced. The core has a concentrated high-index region. Such core design helps defect core mode stay in the cladding's photonic bandgap for a longer wavelength range (>1000 nm) as compared to conventional design. We further point out the importance of our core design in reducing the number of defect modes supported by the fiber structure.     

面向云化的核心网架构分析

随着电子信息技术的发展,网络数据产业也得到同步提高.对于之前传统所用的核心网架结构在发展中却越发凸显了其存在的弊端,且在新数据业务发展下,对网络数据容量方面也提出了更高要求.在本文研究中对现今所运化的核心网架构进行分析,能够对NFV与SDN技术进行阐述,以能对移动核心网络数据云化的趋势,以及云化中所要面临的问题等进行阐述,以此对系统核心网虚拟化管理体系有一定借鉴作用.     

宽带弯曲不敏感多模光纤

针对以太网数据对多模光纤传输性能要求不断提高的问题,文章从材料组成和剖面结构设计的角度,提出了改善宽带弯曲不敏感多模光纤性能的措施。一方面通过优化纤芯掺杂元素的浓度分布,降低最佳剖面折射率分布参数αopt与波长之间的敏感性,提高多模光纤的带宽特性;另一方面在芯—包界面处采用连续可调节剖面结构(内包层),该结构不仅可以减小芯层和凹陷包层粘度差对光纤性能的影响,而且还可以通过界面结构的调节,非常有效地改变高阶模的时延,消除凹陷对光纤带宽性能的影响。测试结果表明,该新结构光纤不仅具有较宽的带宽特性,还具有较低的弯曲损耗。     

TD-SCDMA中Turbo编码算法在ZSP500 DSP核上的实现

文章对TD-SCDMA系统中的Turbo编码器结构及编码算法进行了分析，给出了TD-SCDMA系统中Turbo算法在ZSP500 DSP核上的实现，并根据ZSP500 DSP核的特点对实现部分的进行了阐述。     

Three-phase inductive-coupled structures for contactless PHEV charging system

In this article, a new-type three-phase inductive-coupled structure is proposed for the contactless plug-in hybrid electric vehicle (PHEV) charging system regarding with SAE J-1773. Four possible three-phase core structures are presented and subsequently investigated by the finite element analysis. To study the correlation between the core geometric parameter and the coupling coefficient, the magnetic equivalent circuit model of each structure is also established. In accordance with the simulation results, the low reluctance and the sharing of flux path in the core material are achieved by the proposed inductive-coupled structure with an arc-shape and three-phase symmetrical core material. It results in a compensation of the magnetic flux between each phase and a continuous flow of the output power in the inductive-coupled structure. Higher coupling coefficient between inductive-coupled structures is achieved. A comparison of coupling coefficient, mutual inductance, and self-inductance between theoretical and measured results is also performed to verify the proposed model. A 1 kW laboratory scale prototype of the contactless PHEV charging system with the proposed arc-shape three-phase inductive-coupled structure is implemented and tested. An overall system efficiency of 88% is measured when two series lithium iron phosphate battery packs of 25.6 V/8.4 Ah are charged.     

Synthesis of an aromatic amine derivative with novel double spirobifluorene core and its application as a hole transport material

A synthetic method to prepare a novel double spirobifluorene core structure was developed and a hole transport type exciton blocking material with the double spirobifluorene core was synthesized. A two step ring closing method was used to synthesize the double spirobifluorene core. The double spirobifluorene core based hole transport material showed high glass transition temperature due to rigid structure, and high quantum efficiency in green phosphorescent organic light emitting diodes because of efficient hole injection and triplet exciton blocking properties.