description

老外的PCB设计软件,是免费的.可以上网更新.

<b>Design Rules</b>
<p>
All the parameters relevant to the board and its manufacture
are specified in the Design Rules. The layout can be checked
any time with the aid of the <b>Design Rule Check</b> (<b>DRC</b>
command). These rules are also valid for the Autorouter.