关键词： 三MCU系统   单片机   多处理器   总线控制   存储器共享  

摘要： 介绍以两片80C196KC为主处理MCU、一片89C51进行动态LED显示的三MCU系统。两80C196KC之间通过互访数据存储器进行数据交换,80C196KC与89C51的通讯使用串行口。

关键词： compiler   array privatization   dependence analysis   multiprocessors   noncoherent caches   shared-memory programming   Put/Get  

摘要： The Cray T3D and T3E are non-cacho-coherent (NCC) computers with a NUMA structure. They have been shown to exhibit a very stable and scalable performance for a variety of application programs. Considerable evidence suggests that they are more stable and scalable than many other shared-memory multiprocessors. However, the principal drawback of these machines is a lack of programmability, caused by the absence of the global cache coherence that is necessary to provide a convenient shared view of memory in hardware. This forces the programmer to keep careful track of where each piece of data is stored, a complication that is unnecessary when a pure shared-memory view is presented to the user. We believe that a remedy for this problem is advanced compiler technology. In this paper, we present our experience with a compiler framework for automatic parallelization and communication generation that has the potential to reduce the time-consuming hand-tuning that would otherwise be necessary to achieve good performance with this type of machine. From our experiments, we learned that our compiler performs well for a variety of applications on the T3D and T3E and we found a few sophisticated techniques that could improve performance even more once they are fully implemented in the compiler.

关键词： Profibus   WinCC   多处理器   S5-135UPLC   通信   自动控制  

摘要： 介绍了应用Profibus实现WinCC和多处理器S5 135UPLC的通信方法 。

关键词： 处理系统   SPARC   指令集   多处理器   软件无线电   终端控制器   高速缓存   共享存储器   预取技术   高精度检测  

关键词： board-level clock distribution   GHz and low power clock distribution   multiprocessor computer system   radio-frequency (RF) clock distribution   system signal integrity  

摘要： Conventional interconnections for digital clock distribution pose a severe power consumption problem for GHz clock distribution, because of transmission line losses. They also pose difficult signal integrity problems because of clock skew, clock jitter, and signal reflection. To overcome these conventional digital clock distribution limitations, optical clock distribution techniques, based on guided-wave optics and free-space optics, have been proposed. However, optical clock distribution is bulky, difficult to fabricate, and expensive, even though it has lower power consumption and excellent signal integrity properties. Therefore, we have proposed a RF clock distribution (RCD) scheme for high-speed digital applications, in particular a multiprocessor system using global clocking. This paper first reports system power and signal integrity analysis results including skew, jitter, impedance mismatch, and noise for RF clock distribution, especially in the GHz range. Based on this analysis, a novel signal integrity design methodology for RF clock distribution systems is proposed. The clock skew created by process parameter variations are modeled and predicted. The system comprises a RF clock transmitter as a clock generator, an H-tree with junction couplers as a clock distributing network and a RF receiver as a digital clock-recovery module. Flip-chip interconnections for the chip-to-substrate assembly and 0.35 mum TSMC CMOS technology for the RF clock receiver are assumed. EMI analysis for 2 GHz 16-node board-level RF clock distribution networks is conducted using 3-D full-wave electromagnetic (EM) simulation. Finally, the RCD as a low power and high performance clocking method is demonstrated using HP's Advanced Design System (ADS) simulation, considering microwave frequency interconnection models and process parameter variations. In addition, test vehicles for both 2 GHz 16-node and 5 GHz 64-node board-level RF clock distribution networks were implemented and measure

关键词： 实时多处理系统   动态调度算法   计算机  

摘要： 实时多处理器系统的动态调度算法一直是实时系统研究中的重要课题,而评价实时调度算法性能的一个最重要的指标是调度成功率.在近视算法的基础上提出了一种新的实时多处理器系统的动态调度算法——节约算法.在该算法中,提出了一个新的处理器选择策略,从而提高了算法的调度成功率.同时,为了研究节约算法的有效性,对其进行了大量的模拟,分析了一些任务参数的变化对算法调度成功率的影响,并与近视算法的调度成功率进行了比较.模拟结果显示,节约算法的调度成功率要优于近视算法.

关键词： 多处理器   P4   Xeon   i860   双处理器   家用市场   Foster  

摘要： Intel的P4在家用市场上倍受欢迎,P4 Xeon则是P4的服务器版本,与P4Xeon搭配的是I860芯片组。那么P4和I850与P4 Xeon和I860的组合究竟有什么区别呢? 首先让我们来认识P4 Xeon处理器(图1),P4 Xeon处理器又名Foster,或称为Foster DP,DP就是Dual Processor的缩写,意思是支持双处理器。而如果你需要更多的处理器并行,就必须采用价格更高的Foster MP,MP也就是指支持多处理器(Multi Processor)。

关键词： 一致性   路由器   多处理器系统   性能   Cache  

摘要： 在多处理器计算机系统中 ,Cache一致性是一个十分重要的问题 ,对多处理器系统的性能有很大的影响。在多处理器系统中加入路由器Cache可以有效地减少系统远程访问延时 ,提高系统有效带宽。本文提出了路由器Cache的一种组织方式 。

关键词： 存储系统   冗余   容错技术   数据通路   光纤通道   灾难恢复   多处理器   奇偶检验   冗余校验   奇偶校验  

摘要： 点评;它的结构设计采用了新一代可升级、易配置且高度可用的结构,同时也保留了令CLARiiON产品享有盛名的所有数据完整性和高度可用特性:全球零件供给、全体热备盘、冗余电力和冷却功能、以及整个阵列数据通路奇偶校验等。CLARiiON产品的先进之处还在于其充分使用了先进的多处理器存储处理器、四路光纤通道连接、每个存储处理器至光纤通道磁盘间采

关键词： 计算机   多处理器系统   数据局部性   局部性度量模型   数据变换框架   页迁移   线程一致性模型  

摘要： 数据局部性是多处理器系统中的重要研究方向之一.结合该领域目前国内外研究现状和我们近一阶段的研究进展,讨论了多处理器系统中的数据局部性及其优化问题.针对现有局部性度量模型存在的不足,提出了一种增强的可用于层次式并行计算机体系结构的局部性度量模型.在静态和动态局部性优化技术方面,分别探讨了基于投影分层的数据变换框架和基于瞬时访问信息的动态页迁移策略,并展开了系列相关的讨论.另外,针对利用数据局部性时必须解决的一个关键问题--存储一致性问题,进行了深入的研究,提出了以操作系统为中心的线程存储一致性模型.