共查询到20条相似文献,搜索用时 125 毫秒
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DMA是当今个人计算机系统中应用非常普遍的工作原理,其核心思想是将数据访问和业务运算分离,降低读写开销,提升CPU处理的效率。基于DSP嵌入式系统架构改造的实例,应用DMA原理,解决原有系统中采用中断方式进行数据传输的瓶颈,使整个系统的数据交换效率大幅度改善,并进一步提出采用双口RAM来提升系统的可维护性和性能。这种设计思路还可以应用在其他类型的嵌入式系统(如ARM)中。 相似文献
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利用89C52单片机和双口RAM IDT7132设计了智能ARINC429总线接口卡。采用单片机使接口卡具有了自动数据处理能力,实现了智能化;采取双口RAM作为单片机和ISA总线数据交互媒介,提高了传输速率。讨论了双口RAM的地址空间分配和数据共享冲突仲裁问题,对接口卡的软件设计做了介绍。应用表明,所设计的接口卡具有传输速率高、可靠性好等优点。 相似文献
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介绍了双口RAM器件在数据接口模块的软硬件设计中的应用实例。该模块选用了VME总线方式,主要器件选用了具有强大运算能力的DSP芯片和存储能力极其方便的双口RAM器件,还有差分接口模块和DC/DC电压转换器等。重点介绍了双口RAM CY7C026-25AI的结构特点及其有趣的"乒乓"工作方式,分析了双口RAM与FIFO以及普通存储器的性能差异,对以往SHARC处理器和FIFO芯片的配合方式提出新的观点,即SHARC处理器和双口RAM的组合方式,展示了双口RAM器件在现代数据采集设备中使用的绝对优势。 相似文献
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针对通信系统中,对所有客户线路的电压、电流、温度等数据进行实时多路采集监控,提出了一种基于双CPU结构的数据监控系统的设计方法以及硬件组成。讨论了系统主要芯片之间的连线方法以及软件流程。该系统已经成功应用在邮电系统48V通信线路监控。实践证明,双CPU设计方案不仅满足了系统高运算量、高实时性、抗干扰性要求,而且优化了软硬件设计。 相似文献
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针对车载系统多传感器信息采集处理与大容量存储的需求,采用高性能处理器ARM和高密度的闪存构建车载数据采集系统;就闪存编程慢的特点,使用流水线和并行技术,配以双口的RAM作为高速缓存的方式取代直接对闪存进行编程的传统方法,提高闪存写入数据的速率。在试验中,系统实时处理能力强和256Gbit大容量等特点。 相似文献
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随着嵌入式技术的不断发展,将开源的Linux操作系统和嵌入式技术结合起来,无疑具有广泛的应用前景。从嵌入式Linux系统开发中的实时性问题和裁剪技术问题入手,对嵌入式Linux系统的关键技术进行研究,并提出对应的改进方案。 相似文献
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Reliability, availability and maintainability (RAM) analysis of system is helpful in carrying out design modifications, if any, required to achieve minimum failures or to increase mean time between failures (MTBF) and thus to plan maintainability requirements, optimize reliability and maximize equipment availability. To this effect, the paper presents the application of RAM analysis in a process industry. Markovian approach is used to model the system behavior. For carrying out analysis, transition diagrams for various subsystems are drawn and differential equations associated with them are formulated. After obtaining the steady state solution the corresponding values of reliability and maintainability are estimated at different mission times. The computed results are presented to plant personnel for their active consideration. The results proved helpful to them for analyzing the system behavior and thereby to improve the system performance considerably by adopting and practicing suitable maintenance policies/strategies. 相似文献
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基于现场可编程门阵列实现多波束声呐频域波束形成算法时,通常需要使用坐标旋转数字计算(CoordinateRotation Digital Computer,CORDIC)方法实时生成加权系数,但波束数较多且为宽带信号时会消耗大量硬件资源。文章提出一种改进的基于CORDIC方法实时生成加权系数的方法。通过频点复用处理,多个波束组可共用同一个CORDIC IP核依次实时生成加权系数,降低了87.5%的CORDIC IP核资源消耗;通过引入二维乒乓、用后即抛思想,对存储加权系数的随机存取存储器(Random Access Memory,RAM)基于波束和频点复用进行乒乓处理,可降低97.9%的RAM系数存储空间占用。该改进方法通过多维度复用处理,占用少量RAM存储空间来节省大量CORDICIP核资源,均衡了RAM和CORDIC IP核资源的消耗,具有很好的工程应用价值。 相似文献
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This paper presents the similarities and differences between hardware, software and system reliability. Relative contributions to system failures are shown for software and hardware and failure and recovery propensities are also discussed. Reliability, availability and maintainability (RAM) concepts have been broadly developed for software reliability than hardware reliability. Extending these software concepts to hardware and system reliability helps in examining the reliability of complex systems. The paper concludes with assurance techniques for defending against faults. Most of the techniques discussed originate in software reliability but apply to all aspects of a system. Also, the effects of redundancy on overall system availability are shown. 相似文献
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实时嵌入式操作系统uCOS-II在AT91上的移植 总被引:1,自引:0,他引:1
介绍了嵌入式实时操作系统uCOS-II的特点和内核结构,并通过对ATMEL公司AT91M55800A的体系结构的分析,讨论了移植的可能性,同时提出了移植过程中出现的问题及解决的方法,最终通过设计多任务的应用程序证实了移植的成功. 相似文献
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Failure rate of a system component is usually assumed to be constant in conventional reliability evaluation of power systems. It has been realised from the real-time operation that a component will experience more failures during heavy loading condition than those during light loading condition, which means that the failure rate of a component in real-time operation is not constant and varies with loading condition. In order to evaluate system operational reliability related to load condition, the factors affected condition-dependent failure rate (CDFR) are investigated and a basic CDFR model is proposed in this study. In predictive operational reliability study, equipment loading condition for a given load period is determined using AC power flow based on the corresponding load level with considering load uncertainty. A four-state model has been proposed to represent a system component. The equations for determining the probability of each state for the four-state model have been derived. A technique based on these equations and models has been developed to evaluate operational and annual reliability indices of components, load points and system. The IEEE-RTS has been analysed to illustrate the proposed models and technique. 相似文献