最新的SOPC技术与EDA实验教学

本文以清华大学科教仪器厂开发的TPG-EDA／SOPC教学实验平台为例介绍了传统的EDA（电子设计自动化）实验以及最新的SOPC（基于可编程片系统）技术，基于SOPC技术的系统级设计可以使用RISC（精简指令集）处理器软核，用来支持学生各种不同的实验项目。通过使用EDA设计工具，RISC软核处理器的C编泽器以及大量的FPGA（现场可编程门阵列）资源，可以使用或者重复使用IP来完成各种学生感兴趣的实验项目，培养和锻炼学生的系统级设计能力。     

Optimizing pipeline for a RISC processor with multimedia extension ISA

INTRODUCTION Embedded real-time multimedia applications that involve processing of video and audio streams de- mand an efficient media approach. A thorough survey of media approaches and architectures was given by Dasu and Panchanathan (2002). These media proc- essing architectures can be classified into three cate- gories including dedicated (application-specific) hardware, media processors and instruction set ar- chitecture extensions for general-purpose processors. As for embedded med…     

一种基于.NET集散系统的串行通信实现

介绍以89C52单片机为下位机,PC机为上位机,通过由89C52单片机构成的通信控制器相连的集散系统(DCS)串行通信方案;研究在.NET中如何进行串行通信的编程技术,即如何利用.NET的平台调用技术实现在CLR中的托管代码调用非托管的Win32API串行通信DLL,并结合多线程、事件处理、同步访问技术来实现串行通信编程,还结合实例探讨单片机的串行通信编程技术。     

Low-cost fault tolerance in evolvable multiprocessor systems: a graceful degradation approach

The evolvable multiprocessor （EvoMP）, as a novel multiprocessor system-on-chip （MPSoC） machine with evolvable task decomposition and scheduling, claims a major feature of low-cost and efficient fault tolerance. Non-centralized control and adaptive distribution of the program among the available processors are two major capabilities of this platform, which remarkably help to achieve an efficient fault tolerance scheme. This letter presents the operational as well as architectural details of this fault tolerance scheme. In this method, when a processor becomes faulty, it will be eliminated of contribution in program execution in remaining run-time. This method also utilizes dynamic rescheduling capability of the system to achieve the maximum possible efficiency after processor reduction. The results confirm the efficiency and remarkable advantages of the proposed approach over common redundancy based techniques in similar systems.     

Science Letters: Low-cost fault tolerance in evolvable multiprocessor systems: a graceful degradation approach

The evolvable multiprocessor (EvoMP), as a novel multiprocessor system-on-chip (MPSoC) machine with evolvable task decomposition and scheduling, claims a major feature of low-cost and efficient fault tolerance. Non-centralized control and adaptive distribution of the program among the available processors are two major capabilities of this platform, which remarkably help to achieve an efficient fault tolerance scheme. This letter presents the operational as well as architectural details of this fault tolerance scheme. In this method, when a processor becomes faulty, it will be eliminated of contribution in program execution in remaining run-time. This method also utilizes dynamic rescheduling capability of the system to achieve the maximum possible efficiency after processor reduction. The results confirm the efficiency and remarkable advantages of the proposed approach over common redundancy based techniques in similar systems.     

GPU-based leaves contour generation algorithm

The implementation and optimization of the traditional contour generation algorithms are always proposed for the common processor. When processing high resolution images, the performance often exists low efficiency. A new graphics processing unit (GPU)-based algorithm is proposed to get the clear and integrated contour of leaves. Firstly we implement the classic Sobel operator of edge detection in GPU. Then a simple and effective method is designed to remove the fake edge and a heuristic algorithm is used to repair the broken edge. It is proved by the experiments that the results of our algorithm are natural and realistic in terms of morphology and can be good materials for the virtual plant.     

Implementation of advanced peripheral bus interface for MV10 MCU

MV10 is an MCU which consists of PWM, ADC,CAN and some other function blocks. It is designed for car body’s control. Advanced peripheral bus (APB) is a low speed AMBA bus connecting low-power peripherals. This paper presents an implementation of APB interface for MV10 MCU. After that, MV10 can be integrated into any AMBA system on chips (SoCs) easily. We have built a multi-core system with ABMA to verify this design. In this system ARM9 is a main processor mounted on AHB and MV10 acts as a low-power and low-speed slaver on APB. Before building this system, some operations are encapsulated into a task with dedicated ID. MV10 works as a co-processor with ARM by acquiring task ID from ARM. The result of simulation indicates that MCU can work well as expected. Based on our design, MV10 can be mounted on any AMBA system from now on.     

Application of formant instantaneous characteristics to speech recognition and speaker identification

This paper proposes a new phase feature derived from the formant instantaneous characteristics for speech recognition (SR) and speaker identification (SI) systems. Using Hilbert transform (HT), the formant characteristics can be represented by instantaneous frequency (IF) and instantaneous bandwidth, namely formant instantaneous characteristics (FIC). In order to explore the importance of FIC both in SR and SI, this paper proposes different features from FIC used for SR and SI systems. When combing these new features with conventional parameters, higher identification rate can be achieved than that of using Mel-frequency cepstral coefficients (MFCC) parameters only. The experiment results show that the new features are effective characteristic parameters and can be treated as the compensation of conventional parameters for SR and SI.     

心理实验系统教学效果的实证研究

伴随心理学研究计算机化趋势的出现,以及信息技术与学科教学整合的需要,当前实验心理学教学中主要使用了PES与E-Prime 2种心理实验系统。研究通过实验和问卷调查分析了2种心理实验系统在教学中的效果。结果表明:2种心理实验系统有效促进了学生专业知识综合与运用等能力的发展,激发了专业学习兴趣,但2个系统在教学中表现出各有利弊的特点,需教师将二者结合,以取得更好的教学效果。     

Silicon carbide nanotubes with special morphology prepared by super critical hydrothermal method and photoluminescence character

Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 °C and 8 MPa have been reported in this paper. SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM). There are two kinds of silicon carbide with special morphology: One is oval SiCNTs with small aspect ratio, the other is bamboo cone-shape structure. SiCNTs have been analyzed by fluorescence spectrometer. The results indicate that the SiCNTs have strong photoluminescence (PL) property. The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube. The growth mechanism of silicon nanotubes has been proposed based on experiment data. The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.     

Training for Technology Entrepreneurs

New technology-based business enterprises need qualified and highly motivated entrepreneurs with access to technical resources, facilities and expertise. This paper describes two training programmes for graduate technologists, which assist the transition from full-time education to successful entrepreneurial activity. The programmes are the European Technology Entrepreneurs Programme (ETEP) operating in Northern Ireland and in the Republic of Ireland, and Tijdelijke Onderemers Plaatsen (Temporal Entrepreneurial Placement, TOP) which operates in the Twente region of the Netherlands. Both programmes are sponsored by partnerships of universities and public authorities. The structures and features of ETEP and TOP, and the operating experiences since 1984, are described and discussed. It is concluded that technology entrepreneur development can be accelerated with the support of programmes such as ETEP and TOP. Arrangements for continued collaboration between the centres involved now includes participation in the EC SPRINT programme.     

High-performance hardware architecture of elliptic curve cryptography processor over GF(2163)

We propose a novel high-performance hardware architecture of processor for elliptic curve scalar multiplication based on the Lopez-Dahab algorithm over GF(2163) in polynomial basis representation. The processor can do all the operations using an efficient modular arithmetic logic unit, which includes an addition unit, a square and a carefully designed multiplication unit. In the proposed architecture, multiplication, addition, and square can be performed in parallel by the decomposition of computation. The point addition and point doubling iteration operations can be performed in six multiplications by optimization and solution of data dependency. The implementation results based on Xilinx Virtexll XC2V6000 FPGA show that the proposed design can do random elliptic curve scalar multiplication GF(2163) in 34.11 μs, occupying 2821 registers and 13 376 LUTs.     

Principle of MSD floating-point division based on Newton-Raphson method on ternary optical computer

The division operation is not frequent relatively in traditional applications, but it is increasingly indispensable and important in many modern applications. In this paper, the implementation of modified signed-digit (MSD) floating-point division using Newton-Raphson method on the system of ternary optical computer (TOC) is studied. Since the addition of MSD floating-point is carry-free and the digit width of the system of TOC is large, it is easy to deal with the enough wide data and transform the division operation into multiplication and addition operations. And using data scan and truncation the problem of digits expansion is effectively solved in the range of error limit. The division gets the good results and the efficiency is high. The instance of MSD floating-point division shows that the method is feasible.     

嵌入式GPS数据采集与分析系统设计

介绍了一种基于嵌入式Linux系统和ARM9处理器的手持式GPS数据采集、处理、显示接收机的设计过程。采用ARM-Linux和ARM9处理器的系统作为开发平台,控制OEM板接收导航信息,并给出了GPS数据采集系统详细的软件设计方案,给出了提取GPS特征数据的算法。这些对研究嵌入式系统应用、GPS定位及其在组合导航中的应用以及对OEM板的二次开发等都具有实用价值。     

基于DSP的数字信号处理实验设计

针对数字信号处理及DSP技术教学中的困难,设计1个FIR数字滤波的综合实验.采用窗函数法,借助Matlab程序设计语言,设计FIR数字滤波器,应用DSP汇编语言编程实现该滤波器.实践表明,该实验设计使学生能更好地理解和掌握该课程的基本理论,并能提高学生的工程应用能力,提高本课程的授课效果,提高学生分析问题、解决问题和动手能力,使学生通过本课程的学习更加适应工作的需要.     

环己烷-水-乙醇三元液系相图测定实验

开发了环己烷-水-乙醇三元液系相图测定实验,介绍了该实验的测定方法和测定结果。解决了目前普遍开设的以苯为主的三元液系存在毒性大和刺激性强等问题。     

Implementation of advanced peripheral bus interface for MV1O MCU

MV10 is an MCU which consists of PWM,ADC,CAN and some other function blocks.It is designed for car body's control.Advanced peripheral bus (APB) is a low speed AMBA bus connecting low-power peripherals.This paper presents an implementation of APB interface for MV10 MCU.After that,MV10 can be integrated into any AMBA system on chips (SoCs) easily.We have built a multi-core system with ABMA to verify this design.In this system ARM9 is a main processor mounted on AHB and MV10 acts as a low-power and low-speed slaver on APB.Before building this system,some operations are encapsulated into a task with dedicated ID.MV10 works as a co-processor with ARM by acquiring task ID from ARM.The result of simulation indicates that MCU can work well as expected.Based on our design,MV10 can be mounted on any AMBA system from now on.     

基于PBL模式的EDA技术实验教学改革

针对EDA技术基础实验与综合设计缺少联系,学生在有限实验学时内只能完成一些简单数字系统等问题,引入问题驱动教学法(Problem-Based Learning,PBL)对EDA技术实验进行深化改革。以综合设计导入作为EDA实验教学起点,以综合设计作为核心问题反向设计基础实验的教学内容,以学生作为主体围绕问题寻求解决方案,实践效果表明,显著提升了学生学习的主动性,相同学时可以设计出更加复杂的系统,提高学生解决复杂工程问题的能力。     

Design on general development platform for FPD systems

In this paper, a multi-functional development platform for flat panel display (FPD) development is proposed. With the proposed development platforms, a variety of FPD devices, including organic light-emitting diode (OLED) screens, liquid crystal display (LCD) screens with touchscreens, OLED microdisplay screens, etc., can be directly and instantly connected, examined and utilized. A field-programmable gate array (FPGA) is used in the development system to drive different types of FPD devices, and ARM11 S3C6410 is used as the application processor to provide various services. The development system uses Linux as the system kernel, Qt for Embedded Linux as the UI framework, various system libraries for video and audio services, and a custom-made user engine for fine-polished appearance and behavior. The development platform has been used not only in testing and verification of the FPD devices, but also in building OLED-powered handheld digital devices, shortening the development cycle from OLED devices to mature application products.     

Silicon carbide nanotubes with special morphology prepared by super critical hvdrothermal method and photoluminescence character

Silicon carbide nanotubes (SiCNTs) with special morphology synthesized by supercritical hydrothermal method at 470 ℃ and 8 MPa have been reported in this paper.SiCNTs with special morphology were characterized by transmission electron microscopy (TEM) and high-resolution TEM (HRTEM).There are two kinds of silicon carbide with special morphology:One is oval SiCNTs with small aspect ratio,the other is bamboo cone-shape structure.SiCNTs have been analyzed by fluorescence spectrometer.The results indicate that the SiCNTs have strong photoluminescence (PL) property.The SiCNTs with oval shape are one kind of intermediate state of growth process of nanotube.The growth mechanism of silicon nanotubes has been proposed based on experiment data.The investigations of growth mechanism of SiCNTs with bamboo structure show that the defect produced in the growth process play the important role in SiCNTs with special structure.