Backdrill相关设置及Backdrill文档输出方法
5.定义层（可选）
User Overrides
In most cases, the backdrill layer ranges defined in the Backdrill Setup and Analysis user interface satisfy your requirements to manage stubs. The BACKDRILL_OVERRIDE property allows user-specified control of layer ranges for any pin or via and from ether side of the board or both. This is done regardless of violations that may result, such as testpoint conflicts or backdrilling through a connection. The override property was considered for the design of test coupons where the OEM wishes to evaluate the performance of the board fabricator with respect to the adherence of depth ranges. The designer may override the to layer to effectively drill out the layer where the trace connects the pin/via. The expected usage of this property is limited; please exercise caution to prevent accidental over-drilling.
本文引用地址：http://www.eepw.com.cn/article/191721.htm
Property | BACKDRILL_OVERRIDE |
Purpose | User-specified backdrill range |
Usage | Optional: special circumstances |
Value | TOP:layer_name>:BOTTOM:layer_name> |
Objects | Pins, Vias |
Backdrill analysis flag | O or W (warning) |
定义方法：在Manufacture>NC …Backdrill setup and analysis
6.NC>DRILLLENGEND，输出钻孔表，注意要选择 Include backdrill
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7.产生钻孔文件，输出钻孔文件，也要s Include backdrill
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