A Case Study in Embedded Systems Design: An Engine Control Unit

A number of techniques and software toolsfor embedded system design have been recently proposed. However,the current practice in the designer community is heavily basedon manual techniques and on past experience rather than on arigorous approach to design. To advance the state of the artit is important to address a number of relevant design problemsand solve them to demonstrate the power of the new approaches.We chose an industrial example in automotive electronics to validateour design methodology: an existing commercially available EngineControl Unit. We discuss in detail the specification, the implementationphilosophy, and the architectural trade-off analysis. We analyzethe results obtained with our approach and compare them withthe existing design underlining the advantages offered by a systematicapproach to embedded system design in terms of performance anddesign time.     

网络控制系统调度与控制综合设计研究综述

网络控制系统的设计需同时考虑信息调度和控制性能两个方面。针对网络控制系统中这两方面的综合设计,首先分析了网络控制系统的信息调度研究现状,阐述了现有控制网络调度算法的工作方式和特点。接着从提高网络控制系统综合性能的角度,分析和评价了网络控制系统中调度与控制综合设计的研究成果。最后,提出以兼顾控制性能质量(QoP)和网络服务质量(QoS)为目标的网络控制系统综合性能优化是系统设计的重点,并对网络控制系统综合设计研究的发展方向予以展望。     

一种基于HDTV信源集成解码芯片的RTOS的设计与实现

随着系统集成芯片（SOC）设计复杂度和上市时间等要求的提高，实时操作系统已成为SOC设计中的重要组成部分。HDTV信源集成解码芯片中的实时操作系统负责对进出芯片的数据进行管理，芯片上实现多个实时任务的同步和调度。本文介绍一个以较小内核实现的多任务实时操作系统Iota，它将总线的调度部分的转移到硬件实现，并针对解码芯片设计并实现了多任务混合调度算法。为提高系统的健壮性，Iota还具有一个简单的存储保护策略。     

Aligning demand and supply flexibility in custom product co-design

Flexibility of supply and demand is essential for successful implementation of a mass customization strategy that delivers sustained competitive advantage. Supply flexibility, i.e., a choice of alternative products designed to perform the same basic function, is made possible by the range of capabilities available in flexible and agile manufacturing systems and in supply chains. Demand flexibility is derived from the degree to which a customer is willing to compromise on product features or performance levels in order to meet budgetary (reflected in price) or schedule (reflected in delivery) constraints. Flexibility of both supply and demand can have significant strategic and financial value if they are properly aligned. However, customers are mostly unaware of mapping of demand flexibility on to supply flexibility and its impact on production cost and time. Recent advances in information technology have made it possible to co-design a product that involves customer on one end and the manufacturer on the other. This creates an aura and an opportunity where a middle ground between the supply and demand flexibility can be explored and a “deal” can be struck where both parties settle for a product that is beneficial to both through a negotiated settlement. In this paper, we develop a framework for such negotiations. The customer requirements are treated as a range of negotiable options instead of a set of fixed inputs. Demand and supply for customization is then matched by aligning the flexibility of manufacturing systems with customers’ requirement options. Based on this framework, a negotiation scheme is developed to assist customers and manufacturers in exploring and utilizing demand and supply flexibility information in co-design. The negotiation scheme is formulated using goal programming. Finally, an interactive problem-solving procedure is developed and implemented with an illustrative example.

基于Impulse C的软硬件协同设计及应用

介绍了Impulse Accelerated Technologies公司推出的CoDeveloper硬件/软件协同开发工具,结合实例说明如何基于Impulse C库函数在CoDeveloper工具及Xilinx公司的EDK嵌入式开发环境下进行软硬件协同开发的新技术,为软、硬件工程师特别是软件工程师开发基于FPGA的嵌入式系统提供了新的思路。     

面向工程的SoC技术及其挑战

系统集成芯片(SoC)是21世纪集成电路的发展方向，它以IP核复用技术、超深亚微米工艺技术和软硬件协同设计技术为支撑，是系统集成和微电子设计领域的一场革命。该文阐述了SoC的设计与验证、IP的开发与复用以及工程化SoC所面临的超深亚微米下的物理综合、软硬件协同设计、低功耗设计、可测性设计和可重用技术等方面的挑战。     

一种实现演化硬件的软硬件协同工作模式

演化硬件是一个新兴的研究领域。文章讨论了演化硬件的基本原理,提出了演化硬件实现的四个条件,并对广泛用于实现演化硬件的一种FPGA-XC6200就其特点和结构以及它在实现演化硬件中的应用进行了介绍,并基于这种FPGA芯片给出了一种演化硬件的软硬件协同工作模式。文章最后就演化硬件进一步的研究方向进行了一个总结。     

一种基于RSOC的软硬件协同设计方法研究

针对可重构片上系统(RSOC)应用设计复杂、编程困难的问题,提出了一种软硬件协同设计方法。该方法整体框架基于特定功能模块的软硬件协同函数。给出了方法的基本流程、涉及的关键技术及实现方式,并验证了关键部分的设计方案及可行性。该方法为目标应用设计人员屏蔽了特定功能模块的软硬件实现细节,提高了基于RSOC应用的运行效率和灵活性。     

ThinkDesign技术在创新设计中的应用

随着三维CAD技术应用的不断深入,表明了在参数化CAD技术基础上对三维CAD技术的新需求,以适应企业产品创新设计的新需要．结合ThinkDesign软件技术应用实例,阐明CAD技术对企业开展创新设计的帮助,得出了参数化CAD技术将向创新协同CAD技术的方向延伸。     

基于软硬协同设计的HE-AAC V1解码器设计

介绍了一种基于软硬协同设计方法的HE-AAC解码器设计,重点阐述了软硬件协同机制设计,AQMF和SQMF硬件模块设计.在仿真环境下,45 MHz左右可以实时解44.1 kHz采样率、码率为48 Kb/s的双声道歌曲.