本教程介绍如何在Allegro电路设计软件中设置和管理有效的约束规则,帮助工程师优化信号完整性及电源完整性。
目录一:Physical(Line/vias)rule 物理特性(线宽和过孔)约束设置:
1. “Set values” 设置约束特征值....................................................5
2. “Attach property” 绑定约束........................................................6
3. “Assignment table” 约束规则分配..............................................8
二、“Spacing rule” 间距约束设置................................................................9
1. “Set values” 设置约束特征值..................................................9
2. “Attach property” 绑定约束....................................................10
3. “Assignment table” 约束规则分配..........................................11
三、Constraint areas 区域约束设置............................................................. 12
四、Allegro 中走线长度的设置................................................................... 13
1. 差分线等长设置.................................................................................. 13
2. 一组Net 等长...................................................................................... 16
3. XNet 等长............................................................................................ 17