Cadence Allegro 17.4 芯片封装设计
1：新建Item
打开PCB Editor 17.4，选择File- New. . . from the menu bar
2：设置
The New Drawing dialog box will be displayed：
3：调整作业区视图
set up a drawing area that is practical for this design
3.1 Select Setup - Design Parameters. . . from the menu bar.
3.2 select the Design tab：
3.3 点击Apply，but not the OK
3.4 Select the Display tab.
3.5 set spacing:
3.6 确认以上所有修改，关闭对话框。
4：place the padstacks
Select Layout - Pins from the menu bar
in the Options pane press “. . .” after the Padstack
pick or find the padstack， example：pad60cir42d
to be continued…