基于JTAG的ARM嵌入式系统调试技术实现及应用

文章介绍了JTAG结构及其TAP控制器的控制机制,描述了ARM芯片的JTAG调试原理,给出厂一种基于JTAG接口协议的ARM调试设计方案及其软硬件实现,并利用JTAG接口进行硬件设备的远程调试。     

51单片机串口通信仿真的纯软件实现

本文介绍了一种使用纯软件仿真的串口通信调试技术,使用到的软件有VSPD（虚拟串口）、串口调试助手软件、Proteus和Keil等。该技术完全不需要硬件仿真电路,对调试计算机也没有特殊的硬件接口要求;使用简单方便、经济成本低,有利于控制研制成本;并且可应用于其他硬件平台开发场合。     

用BDI2000和ADS实现在线调试ARM7和映象烧写

提出了使用BDI2000仿真器和ADS开发环境实现在线调试嵌入式系统和映象烧写的方法。分别详细介绍了BDI2000和ADS的使用配置及注意事项。最后结合实例，说明了如何使用BDI仿真器和ADS集成开发环境通过JTAG接口对嵌入式目标板进行程序烧写。     

一种基于JTAG协议的嵌入式调试接口设计方法

提出了一种新的嵌入式调试接口设计方法,设计者可以重用JTAG标准的串行接口进行监视,跟踪并分析在嵌入式微处理器上运行的程序.通过采用调试接口电路的流水线映像寄存器组和特殊数据通路,可以避免在CPU关键路径上插入扫描链实现"非侵入性"的调试功能.为了提高JTAG接口的数据传输效率,指令寄存器和相关控制逻辑被重新设计.在JTAG转换器的设计中,提出如何通过采用JTAG调试代理协议来简化调试工具的移植,这种方法通过了硅验证,调试接口已被成功应用于CK510平台上.     

基于"龙腾"R2 的在线调试系统的设计

在JTAG工业标准的基础上,为"龙腾R2"微处理器提出了一种在线调试系统的实现方案.通过扩展JTAG的TAP控制器,并在微处理器内部加入控制模块,实现了软件调试的单步执行、硬件断点、软件断点及监控和修改寄存器及存储器等多种片上调试功能.以较小的硬件开销,获得了较大的调试功能.     

利用远程纠错跟踪Linux TCP/IP内核源代码

提供了一个了解Liunx众多的内核源代码的方法,分析了如何在计算机上使用远程调试来分析Linux内核源代码,并以LinuxTCP/IP协议驱动程序为例,描述内核程序的流程.使用KGDB与GDB来实现远程调试,并利用工具KernProf来分析内核函数间的相互关系.     

基于云计算平台的计算机硬件远程实验室实现

针对传统计算机硬件实物实验、虚拟实验的问题,提出了基于云计算和真实实验板的远程实验室.使用浏览器可以远程配置实验板上的FPGA进行实验;服务器可记录用户实验日志,有效地对硬件资源进行调度;利用JTAG机制实现了实验快照的保存和恢复功能;同时系统还支持实验预约功能.在此基础上,开发了计算机硬件远程实验室,测试结果表明该实验室已经在包括计算机原理等课程在内的计算机硬件课程中得到了成功应用.     

在ARM7TDMI和uClinux平台下实现GDBServer应用

GDBServer是GDB的远程调试代理，广泛应用于嵌入式linux的用户空间程序调试. 分析了GDBServer的工作原理，介绍了RSP协议，在运行于ARM7TDMI内核处理器的uClinux系统实现了GDBServer的移植和应用.     

嵌入式旋转机械状态监控与故障诊断系统研究

从实现具有自监控、自诊断能力的智能化机械设备的角度,系统介绍了面向Internet的、具有远程监控、诊断、维护和升级能力的嵌入式旋转机械智能状态监控与故障诊断系统的实现技术.该系统采用数字信号处理器(DSP)及嵌入式计算机,实时检测并存储设备运行的转速、振动等信息,由DSP进行故障信号处理和特征分析,并通过自定制的嵌入式Linux操作系统实现了面向Internet的远程软件升级和系统维护,其内嵌的基于移动代理的嵌入式诊断软件可以通过局域网或Internet与远程故障诊断中心自动交互诊断信息,实现协同诊断,有效地提高了设备状态监控与故障诊断系统的智能化水平.     

面向车身控制应用的8位MCU JTAG片上调试模块设计

基于IEEE 1149.1标准,设计了面向车身控制的8位MCU的JTAG片上调试系统。该系统很好地支持断点与观察点设置、外部调试请求、内存和存储器访问等基本调试功能。在几乎不改动内核的基础上,解决了内核中编码长度和执行周期不同的指令,给片上调试带来的困难和挑战,实现了单步调试、指令插入等功能。通过提出的方法,只需保护现场PC值,避免了一系列现场保护措施,减小了硬件实现代价。     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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