【摘要】 SIM是一个功能较强的交互式混合级逻辑模拟工具,是VLSI CAD系统PANDA的一个重要组成部分。SIM覆盖门级、功能块级和开关级,把三者有机地结合在一起,既能模拟其中任一级的电路,也能模拟三种级别混合的电路。在门和功能块级模拟中可以针对各种延迟类型进行模拟。功能块可以是由用户用功能描述语言FDL描述的任意电路模块。开关级模拟采用类似MOSSIM的算法计算各节点稳态值,直接利用晶体管的长宽比或等效电阻电容等参数进行模拟,在计算延迟时采用较为精确的模型,使得计算精度比门级要高得多,SIM有方便、丰富、直观的交互处理功能,便于用户灵活地操作。在开发SIM的过程中,从一开始就遵循软件工程方法,具有较好的灵活性、可扩充性、可维护性,附有完备的文档资料。本文阐述SIM的基本功能和总体设计思想。更多还原

【Abstract】 SIM is an advanced interactivc mixed-level logic simulatipn tool, one of the important parts of the VLSI CAD system PANDA. SIM can simulate gate-level, functional-block-level and switch-level circuits,and their mixture.In gate-level and functional-block-level, the simulation uses all kinds of delay types,A functional block can be defined by users using the function description language FDL.In the switch-level simulation we use MOSSIM-based algorithm to calculate steady state value.Instead of the unit delay used in MOSSIM Algorithm, we use nodal delay po teutial equations, combining with MOS transistors equivalent dynamic resistance, as well as the effect of the slope of the input waveforms, to calculate the signal delay, so the calculation accuracy is much better than that of gate-level. SIM has convenient interactive ability to help the users to operate the tool.During the de veloping time, we obey software engineering method. This paper introduces its basic functions and total design ideas.更多还原