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随着LSI(大规模集成电路)规模的增大和速度的提高,采用EDA(电子设计自动化)工具的自上而下的设计方式日益重要.今天,如果说没有EDA工具就无法设计LSI,也决不是过甚其词.下面,以逻辑LSI的设计为例,介绍目前常用的EDA具.大部分LSI,都是由若干形成单元的电路(宏单元)组合而成.宏单元的电路规模各不相同,既有相当于一个逻辑门电路的小电路,也有完整的中央处理器(微处理器)之类的大规模电路.LSI的设计过程,可以分作几个阶段.在下文中,共分作五个阶段.其中的四个阶段,属于LSI整体设计过程,即系统设计、功能与逻辑设计、布局设计及测试设计;第五个阶段,是宏单元本
As the scale and speed of LSIs increase, the top-down approach to EDA (Electronic Design Automation) tools is increasingly important. Today, if you can not design an LSI without an EDA tool, Not too over .In the following, the design of the logic LSI, for example, introduces the commonly used EDA with most of the LSI, are formed by the number of cells (macrocells) combination of macrocells vary in circuit size , Both a small circuit equivalent to a logic gate circuit and a complete large-scale circuit such as a central processor (microprocessor) .LSI design process can be divided into several stages.In the following, divided into five Phase, of which four stages belong to the overall design process of LSI, that is, system design, functional and logical design, layout design and test design; the fifth stage is the macro unit