微型计算机中的串行通信总线技术

介绍了RS-232C、USB及IEEE1394等个人计算机上采用的串行通信总线技术.剖析了USB和IEEE1394总线的分层体系结构,并对每一个层次给出了详细说明.描述了USB及IEEE1394总线物理连接器的结构和特点.     

USB通信技术

本文讲述了USB通信技术。首先叙述了采用USB总线的优点及其协议规范版本变动，再次描述了USB系统的结构、通信数据流模型；接下来详细讲述了USB的通信传输基础，两种通信方式，控制传输、中断传输、批量传输、同步传输四种传输类型以及USB设备的枚举过程。最后是关于USB设备端固件程序的设计思想，并以PDIUSBD12为例给出了固件程序设计流程图。     

基于BU-61580与USB的MIL-STD-1553B总线控制卡的设计

MIL-STD-1553B总线是一种军用串行总线,具有完整的总线通信协议,具有很高的可靠性,在航空、航天、汽车电子等领域有广泛的应用。USB总线是一种常用的通用串行总线,USB完整的通信协议使得USB传输具有很高的传输速率,接口通用性强等优点,为了在地面测得飞机或者卫星等应用上的1553B总线通信是否正常,需要专门的总线控制卡来进行通信测试,本文介绍了一种基于BU-61580和USB芯片设计的1553总线控制卡,该控制卡实现1553B总线控制的基本功能,包括读取和发送数据,发送方式控制字,向总线广播数据等基本的总线消息,同时继承了USB的各种优点,即支持即插即用功能,传输速度高,支持可编程的消息控制模式,并且介绍了这种总线控制卡的实现方法,包括BU-61580与USB芯片的硬件连接和软件实现,最后介绍了控制卡的测试结果。     

USB通信技术

本文讲述了USB通信技术.首先叙述了采用USB总线的优点及其协议规范版本变动,再次描述了USB系统的结构、通信数据流模型;接下来详细讲述了USB的通信传输基础,两种通信方式,控制传输、中断传输、批量传输、同步传输四种传输类型以及USB设备的枚举过程.最后是关于USB设备端固件程序的设计思想,并以PDIUSBD12为例给出了固件程序设计流程图.     

基于Linux系统的USB主机接口设计与实现

USB是典型的主/从结构.只有USB HOST(主机)才能与USB device通信,其他的设备端口之间不能实现直接通信.本文主要讨论了在嵌入式Linux开发平台下设计USB主机接口设备的一般方法,以及在该平台下USB驱动程序的开发.此外,主机控制器实现了USB总线与计算机系统的连接,本文着重阐述了主机控制器芯片的驱动程序开发.     

USB/RS-232转换器的最简设计方案

由于USB总线的诸多优点，以传统的RS-232接口为数据通信通道的外部设备正越来越多地朝着采用USB总线的方向发展，设计一种内置式或外挂式的双向RS-232／USB转换器就很有必要．文章重点介绍一种以专用芯片FT8U232AM为转换控制器的最为简洁的设计方案．     

基于USB总线的多功能车辆总线网卡设计与实现

对多功能车辆总线（MVB）网卡的结构进行分析,运用VHDL语言实现FPGA中的逻辑设计,使用USB总线实现PC机与FPGA之间的高速数据传输,从而实现PC机与MVB网卡的通信.介绍了USB接口部分的硬件电路设计、FPGA的软件设计以及上位机的软件设计.目前,本设计方案已成功应用于某地铁列车通信控制系统.     

计算机高速通用串行总线接口开发

通用串行总线[USB]是一种新型的计算机外围接口标准.它具有即插即用、扩展方便、数据传输率高等特点.但由于USB总线协议复杂,使得USB设备的开发比较困难.本文首先介绍了USB的总体性能及特点,然后对USB总线的系统体系结构、通信模型、机械规范和电气规范以及USB设备结构作了简要介绍,总结了USB设备开发的一般过程,并对目前USB芯片进行了简要介绍.     

基于USB接口的变电站自动化系统中通信控制器的设计

变电站自动化系统中采用通信控制器负责与上位机及调度中心的通信。传统的设计抗干扰能力差,且安装不便。本设计则利用USB总线的优点,采取多种抗干扰措施保障数据通信的安全高效,并对USB传输机制作了简要的介绍。     

基于TL718的K总线-USB转换器设计

本文采用USB接口技术实现K总线网络与计算机之间的通信,设计的转换器可以应用于上位机软件监控K总线的实时信息。主要介绍了K总线与USB之间的接口电路的硬件设计方法,测试结果表明上位机软件通过该转换器能准确的读取汽车电子控制系统中的故障信息。     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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