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Allegro 17.2 backdrill solder mask export to GERBER

VECTORT

Hi,

I have created design with backdrills and right now I have an issue with exporting soldermask do gerber files.

For via solder opening there is a layer: VIA CLASS/SOLDERMASK_TOP and VIA CLASS/SOLDERMASK_BOTTOM

And that works perfectly but when backdrills are created the solder mask opening is set in layer named BACKDRILL_SOLDERMASK.

But this layer I can be see only in "PAD Editor" in "Mask Layers" tab.

There I can see SOLDERMASK_TOP: none SOLDERMASK_BOTTOM: none and in BACKDRILL_SOLDERMASK: Circle 0.55

And I have no idea how to export it to GERBER files because there is no such layer in Artwork to be selected.

Thanks in advance for any help. 

  • steve

    The pad size on the standard SOLDERMASK_TOP and SOLDERMASK_BOTTOM layers for Via and Pins will be enhanced based on the Backdrill Soldermask in the Padstack. This dynamic pad size change is done when a Via or Pin is marked as a Backdrill location. There will not be a separate Soldermask layer for Backdrills it will be combined with the standard Soldermask layers.Thanks to Mike for this :-)

  • VECTORT
    The thing that it does not do it. That is why I posted this question.
    Maybe somewhere is an option to turn it on.
    In my project most of backdrills are on bottom so I am creating artwork with layers:
    VIA CLASS/SOLDERMASK_BOTTOM
    PIN/SOLDERMASK_BOTTOM
    PACKAGE GEOMETRY/SOLDERMASK_BOTTOM
    BOARD GEOMETRY/SOLDERMASK_BOTTOM

    And I cannot see any opening for backdrills in created GERBER file.
    Of course backdrill process finished without errors and warnings before artwork creation.
  • steve

    Hmmmm works for me so make sure you are running the latest version of the software 17.2-2016 S020. Look at Help - About and if it's not that version get it from htttp:/support.cadence.com

  • VECTORT

    I am using the newest one Allegro 17.2 with hotfix 020.

    Please find attached print screens on the left hand side gerber file and on the right allegro screen.

  • steve

    Based on the fact that Soldermask_bottom is set to none I would think that the mask shown is the backdrill Soldermask BUT to confirm try editing the padstack and make the size larger so that when the artwork is generated it would be clear if it is using this entry or not.

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