混合SoC设计

介绍了混合SoC(片上系统集成)的概念,重点阐述了混合SoC的设计流程和面临的问题,并对其解决方法进行了有益的探讨.     

Surface triangulation for polygonal models based on CAD data

This paper presents an approach to the generation of unstructured surface meshes for Computer‐Aided Design (CAD) surface models represented as lists of polygons with minimum user interventions. Stereolithography (STL) data are adopted as an interface between a CAD system and the surface grid generator. STL files often include problems such as overlapping surfaces, gaps, and intersections. They have to be revised quickly and automatically before the surface models are used for the background grid of the surface grid generation. In this paper, we describe an automatic revision method for use with STL‐defined surface models. The advancing front method using geometric features is adopted directly on the modified STL surfaces. The capability of the method is demonstrated for several 3D surface models. Copyright © 2002 John Wiley & Sons, Ltd.     

一种改进的安全访问控制矩阵模型

操作系统安全保密的核心是访问控制。基本访问控制矩阵作为一种数学模型,在许多实际系统的访问控制中得到了应用,但是它不能满足对安全性有特殊要求的操作系统。本文在基本访问控制矩阵的基础上加上了访问条件,提出了一种三维访问控制矩阵;并且就主体和客体按访问条件的分类对这种矩阵的简化提出了一些看法。作为上述观点的实际例子,本文还介绍了一种非接触式IC卡的访问控制机制。     

厚膜集成电路丝网印刷工艺技术

重点介绍了厚膜集成电路的丝网印刷工艺技术和影响印刷质量的因素 ,并以厚膜电阻器为例 ,简述其制作工艺过程 ,以及丝网印刷缺陷对厚膜电路的影响     

利用PCB设计工具进行集成电路版图设计

如果EDA系统配置不全面,如何充分利用现有条件更好更快地完成集成电路的设计工作?本文介绍了我们利用PCB(印刷电路板)设计工具设计集成电路版图的方法,并以一个600门的数字电路为例加以说明。PCB设计与版图设计本是两种类型的工作,但在某些条件下,将它们结合在一起可以充分利用计算机资源高效率地完成设计工作。希望本文在集成电路设计方法及充分利用计算机资源方面起到抛砖引玉的作用。     

An Integrated CAD Methodology for Yield Enhancement of VLSI CMOS Circuits Including Statistical Device Variations

In this paper a novel CAD methodology for yield enhancement of VLSI CMOS circuits including random device variations is presented. The methodology is based on a preliminary characterization of the technological process by means of specific test chips for accurate mismatch modeling. To this purpose, a very accurate position-dependent parameter mismatch model has been formulated and extracted. Finally a CAD tool implementing this model has been developed. The tool is fully integrated in an environment of existing commercial tools and it has been experimented in the STMicroelectronics Flash Memory CAD Group.As an example of application, a bandgap reference circuit has been considered and the results obtained from simulations have been compared with experimental data. Furthermore, the methodology has been applied to the read path of a complex Flash Memory produced by STMicroelectronics, consisting of about 16,000 MOSFETs. Measurements of electrical performances have confirmed the validity of the methodology, and the accuracy of both the mismatch model and the simulation flow.     

基于混合图的总体布线调整

本文提出了一种基于混合图的总体布线调整方法。混合图是对表示布局的有向图进行一系列精确的顶点分解而产生的。用得到的图模型来表示总体布线信息,从而可以在总体布局优化的同时估计布线对芯片面积的影响,并对总体布线进行调整。由于总体布线是自动更新的,所以布局同时随着布线的调整和模块的移动而改进。本文还提出了多种瓶颈的概念和瓶颈间走线随模块旋转而变化的规律。最后给出的实验结果表明,这种算法在减小芯片面积上获得比较好的结果。     

一种二—五进制计数器的设计与制作

采用ＥＣＬ技术研制了一种二－五进制计数器ＳＥ１６７８。文章主要介绍了该器件的工作原理，版图和工艺设计及器件的性能分析等，最终产品典型工作频率可达５５０ＭＨｚ，最高电路翻转频率可达７５０ＭＨｚ，功耗电流典型值为１２０ｍＡ。     

逻辑函数化简语义树

提出了一种逻辑函数化简语义树算法，其特点是在求全部本源蕴涵项和从本源蕴函项集合中选取最小覆盖两步中都采用同一算法，因此，算法程序的编写可较为简单，最后，从解题质量和解题速度等方面对该算法进行了评价。     

CAD技术在电子封装中的应用及其发展

现代电子信息技术的发展,推动电子产品向多功能、高性能、高可靠性、小型化、低成本的方向发展,微电子封装、IC设计和IC制造共同构成IC产业的三大支柱。计算机辅助设计(CAD)作为一种重要的技术手段在IC产业中发挥了巨大作用,已广泛应用于电子封装领域。本文结合各个时期电子封装的特点,介绍了封装CAD技术的发展历程,并简要分析了今后发展趋势。