关键词: 用户约束, TCL语言, 文件解析, 电子设计自动化

Abstract: User constraints are critical in the use of EDA tool.It is an important part of the tool.In view of the complex and changeable problem of user constrained rules,this paper describes a method of using TCL to implement user constrained file parsing.First,user constrained rules are declared,and then the parsing rules are defined.Finally,user constrained files are read and parsed line by line.When user constrained rules are changed or added,we only need to modify or add corresponding declarations and parsing rules.As a result,it has very high conciseness,extensibility and portability.Itis valuable in practicalapplication in the EDA tools.

Key words: userconstraints, TCL, file parsing, EDA