基于VERILOG—HDL的简化异步收发器的设计与仿真

该文阐述了通用异步收发器（UART）异步串行通信原理,介绍了实现UART异步串行通信的硬件接口电路及各部分硬件模块。该文基于Verilog语言实现了接收器和发送器这两个UART的内部核心功能模块,通过Modelsim对相应Verilog-HDL程序的仿真,验证了其异步串行数字接收和发送的功能。     

基于FPGA的UART IP核设计与实现

本文设计了一种基于FPGA的UART核,该核符合串行通信协议,具有模块化、兼容性和可配置性,适合于SoC应用.设计中使用Verilog HDL硬件描述语言在Xilinx ISE环境下进行设计、仿真,最后在FPGA上嵌入UART IP核实现了电路的异步串行通信功能.     

基于VERILOG-HDL的简化异步收发器的设计与仿真

该文阐述了通用异步收发器(UART)异步串行通信原理,介绍了实现UART异步串行通信的硬件接口电路及各部分硬件模块。该文基于Verilog语言实现了接收器和发送器这两个UART的内部核心功能模块,通过Modelsim对相应Verilog-HDL程序的仿真,验证了其异步串行数字接收和发送的功能。     

基于FPGA的通用异步串行接口IP软核设计与实现

设计了一种基于现场可编程门阵列(FPGA)的通用异步串行控制器(UART)的IP核,该核符合串行通信协议,具有可重配置、可扩展性、灵活性、兼容性、功耗低的优点,适合于SOC应用。设计使用Verilog HDL硬件描述语言在QuartusII环境下进行设计、综合、布局布线,在Model Sim下仿真,最后在FPGA上嵌入UART的IP核实现异步串行通信功能。     

基于FPGA的视频图像处理器的串行通信设计

提出了一种在FPGA上实现视频图像处理器分系统与系统之间的数据串行通信设计方法,采用UART串行数据传输协议,传输波特率可设置调整,采用视频场同步信号作为发送器发送控制信号,实现视频图像处理的实时性要求。串口采用双口RAM实现与视频图像处理部分的异步通信。设计中大量采用参数化设计,使用灵活、通用性强,可实现FPGA与一般串口通信系统通信。设计程序下载到FPGA芯片中,通信数据完全正确,电路工作稳定、可靠。     

基于FPGA的简化UART电路设计

本文阐述了通用异步发生器UART的功能特点,介绍了用硬件描述语言Verilog来开发各个模块,并给出仿真结果.本设计使用Ahera的FPGA芯片,将UART的核心功能嵌入到FPGA内部,能够实现异步通信的功能,可以将其灵活地嵌入到各个通信系统中.     

一种基于TMS320C55x DSP的UART通信设计

全双工异步串行通信在TMS320C55xDSP上的通常实现方式是利用DSP的McBSP接口加外接芯片实现,这种设计方法增加了实现UART的硬件成本和电路设计复杂度.提出了一种直接利用DSP的MCBSP接口和DMA通道实现UART的方法,给出了使用C语言和CSL的编程方法.与传统实现方法相比,具有实现成本低,硬件电路简单,移植性强等特点,稍加修改可应用于C5000和C6000各系列芯片中.     

基于单片机和CPLD的串行通信帧协议转换系统

介绍一种基于MCS51单片机和Altera公司的MAX7000S系列CPLD的全双工异步串行通信帧协议转换系统的设计与实现.重点介绍了异步串行通信收发器(UART)的CPLD实现;以及单片机在未知待接收串行通信帧的帧长和界定符的情况下,对串行数据流按时域分帧的方法.     

利用80C196MC PTS 实现异步串行通信

异步串行通讯在单片机通讯中占据了相当重要的地位,因此大多教单片机都配备了UART来支持异步通讯.当单片机不支持UART时,利用别的方法实现异步串行通信就显得非常有意义.本文在分析异步串行通信规范的基础上,总结了实现异步串行通信的条件.然后深入讨论了80C196MC外设事务服务器实现异步串行通信的机理和时序.最后就异步串行通信编程实现中的一些要点和难点进行了分析.     

带硬件地址识别的UART IP的设计和实现

在通信和控制系统中,常使用异步串行通信控制器(UART)实现系统辅助信息的传输。为实现多点通信,通常用软件识别发往本站点或其它站点的数据,这会加大CPU的开销。介绍了一种基于FPGA的UARTIP,由硬件实现多点通信时的数据过滤功能,降低了CPU的负担,提高了系统性能。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate