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可编程逻辑器件的应用使逻辑电路的设计与修改更加灵活,实现起来更加方便.但使用现有的可编程逻辑器件计算机辅助设计软件需要一定的专业知识,对于一般用户有一定的困难;而系统内所提供的逻辑自动划分功能算法对于有些特殊应用还会遇到一些难以解决的问题.鉴于此,作者开发了针对指定PLD芯片的自动生成多输入单输出(MI/SO)组合逻辑的ABEL编程文件的软件.本系统由于仅利用遍历操作实现逻辑划分,按存储器访问次数计算,该算法的计算复杂度仅为O(n+kn),不存在组合爆炸问题,它能够将大规模的多输入单输出组合逻辑函数自动分解,自动生成ABEL语言的设计文件,并能够自动给出芯片之间的连接方式. 相似文献
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本文阐述了软件工程导论课程双语教学的目标和定位以及我们对双语课程教学的一些认知,分析了在双语教学过程中我们所采用的一些理念和方法,从教材、考核、实践、交流等多个环节介绍了该课程双语教学的实施细节,最后讨论了存在的问题和进一步的教学研究。 相似文献
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作为自动交换光网络中的核心器件。光开关将在未来全光网中发挥着重要作用,并成为未来光联网的关键技术.本文总结光开关实现方法的最新进展,重点介绍电光效应开关和超高速光控开关的工作原理和实际应用.最后阐述我实验室在光开关性能检测方面所做的研究工作. 相似文献
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Investigation on gain characteristics in non-degenerate cascaded phase sensitive parametric amplifiers
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We theoretically and experimentally show the impact of the ratio between the signal and idler generated from the PIA part on the gain characteristics in the continuous wave (CW) pump non-degenerate cascaded phase-sensitive fiber optical parametric amplifier (PS-FOPA). The results show that the length of highly nonlinear fiber (HNLF) used for generating the idler can cause the variation of power ratio between the idler and signal, which significantly affects the gain characteristics of the PS-FOPA under the small signal gain condition. To obtain high gain, it is better to choose long HNLF to generate idler. In our experiment, 5.5 dB gain and 18 nm bandwidth (on/off gain>10 dBm) in PS-FOPA can be achieved when 300 m-long HNLF instead of 200 m-long HNLF is used in PIA. 相似文献
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In order to analyze the thermal characteristics of the cavity facet of a semiconductor laser, a home-built near-field scanning optical microscopy (NSOM) is employed to probe the topography of the facet. By comparing the topographic images of two samples under different DC current injections, we can find that the thermal characteristic is related to its lifetime. We show that it is possible to predict the lifetime of the semiconductor laser diode with nondestructive tests. 相似文献