Issue link: https://resources.pcb.cadence.com/i/1180264
Working with Backdrilling
Backdrilling
October 2019 20 Product Version 17.4-2019
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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 either 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.
Padstack Editor Backdrill Data Support
Padstacks now support the definition of backdrill specific data which is used at backdrill
locations. No need to generate special padstacks or keepouts to maintain design integrity.
Fabrication vendor can provide backdrill requirements to assist in padstack updates.
Property BACKDRILL_OVERRIDE
Purpose User-specified backdrill range
Usage Optional – special circumstances
Value TOP: