说明：  对于 PCB 的设计， Protel DXP 提供了详尽的 10 种不同的设计规则，这些设计规则则包括导线放置、导线布线方法、元件放置、布线规则、元件移动和信号完整性等规则。根据这些规则， Protel DXP 进行自动布局和自动布线。很大程度上，布线是否成功和布线的质量的高低取决于设计规则的合理性，也依赖于用户的设计经验。 对于具体的电路可以采用不同的设计规则，如果是设计双面板，很多规则可以采用系统默认值，系统默认值就是对双面板进行布线的设置
(For the design of the PCB, Protel DXP provides a detailed 10 different design rules, these design rules include wire placement, wire routing method, component placement, routing rules, signal integrity components, mobile and rules. According to these rules, Protel DXP for automatic placement and automatic routing. A large extent, the success of routing and routing design rules depends on the level of quality is reasonable, but also depends on the user' s design experience. For the specific circuit design rules can be different, if it is double-sided design, a lot of rules can use the system default value, default value is the two-panel layout settings)