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allegro,orcad, net alias,port,off-page connector之间的异同点和如何选取
2022-07-03 13:33:00 【huangbinvip】
在使用cadence系列工具orcad绘制原理图的时候,有几个符号的功能非常相近,作用类似,但是又不完全相同,细微的差别可能就会导致你在绘制复杂原理图的时候选择错误,最后做DRC检测的时候报错。
如上图所示,有三个功能,都是放置网络符号的作用:
1、net alias: 网络别名,顾名思义,就是给连接的网络起一个容易记忆,有含义的名字。
2. place port:放置一个端口,人如其名,那就是放置一个端口,用一个网络名字来连接两个端口。
3. place off-page connector: 放置离页的连接符号
在原理图上,它们长的样子这个样子:
如何区别和使用它们,看上图说话:
- net alias:这个是没有独立的符号的,需要放到wire上,其使用范围仅仅限于在同一张原理图页面内。
- palce port:这个网络符号要求连接的两个port都具有相同的属性,比如都是input或者ouput,这个符号一般用在层次图设计中,表征是有相同属性的端口。
- place off-page connector:这个符号用在连接两张不同的原理图的相同网络,在同一张原理图上不能使用,否则报错 。
由此可以简单总结一下:
同一个页面网络连接用net alias,不同页面之间网络连接用place off-page connector,层次图设计用palce port,三个不要混用,就不会出错啦。
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