EDA technology,through the "Top down"designing conception and adoption of illustration and linguistic description of the function of chips,has changed the traditional designing pattern of "modular system"which used the fixed device,thus increasing the freedom of the design of digital system,decreasing the type and quantity of the needed chips,contracting their volume.
它改变了传统采用固定器件的“积木式”设计模式 ,通过“自顶向下”的设计思想 ,采用图形描述或语言描述灵活定义芯片功能 ,提高了数字系统设计的自由度 ,减少了所用芯片的种类和数量 ,缩小了体积 ,降低了功耗 ,提高了系统的整体性能 。
This paper discusses the top-down design method based on SYNARIO software.
作者结合Synario软件详细讨论在系统可编程器件自顶而下的设计方法，并以ispLSI1016为例说明如何实现在系统可编程。
We propose a top-down design approach which specify desired global behaviors with a conversation protocol,after we analyzed the drawback of the bottom-up approach,and then verify whether the global protocol satisfy the preset system goals.
我们先分析自底而上方法的不足,提出了一种自顶而下的设计和验证方法。
Aimed at the drawbacks of bottom up product design process in traditional 3D CAD tools, a top down 3D Feature Modeling method was presented.
针对现有三维CAD工具在自底向上产品设计建模方面存在的不足 ,提出了自顶向下的特征建模方法 ,包括六个层次 ,即功能层、概念设计层、装配层、零件层、特征层和B rep层 。
By attaching constraints to virtual part, top down design and concurrent design are well supported in this model.
通过对零件拓扑面建立编码 ,提出了虚拟零件和虚拟元素的概念 ,建立了虚拟零件模型 ;根据虚拟零件的特性构建了基于虚拟零件的装配模型 ,把约束信息附着在虚拟零件上 ,使得该模型可以很好地支持自顶向下设计和并行设计 。
To meet the need for concurrent engineering, this paper puts forward a top down assembly modeling method and introduces an assembly modeling system for gear box (GBAMS) developed by using top down method.
为适应并行工程对产品装配建模系统的需要，提出了将产品装配建模过程作为一个智能设计过程，以自顶向下的方式建造产品装配模型的方法，并介绍了用该方法开发的变速箱装配建模系统（ＧＢＡＭＳ）。
The Design of Rear Seal for Crankshaft Pressing Device Based on Top-down Technology;
基于自顶向下的曲轴后油封推装装置的设计
Virtual Assembly Design Based on Top-down Method;
自顶向下的虚拟装配设计
According to VHDL of Top-Down Design Method for Digital System;
基于VHDL的自顶向下的数字系统设计方法