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Silksceen DRC

BK2018

I'm not sure about this, hence asking.

I usually check silkscreen by visually looking at the board on the screen.

This method has failed me now that the boards are getting larger, besides silkscreen being on so many different classes.

Is there a DRC that can be set to check for overlapping silkscreen? (without using autosilk)

Thanks!

  • steve

    Yes make sure you are running 17.2-2016 S048 or later then look at the Manufacturing Tab inside Constraint Manager, There's a how to video here:- www.youtube.com/watch

  • BK2018
    in reply to steve

    Thanks Steve, great videos by the way!  

    I tried like the video and it didn't catch silkscreen refdes overlapping silkscreen refdes.  Is there another setting to be configured to achieve this?  

  • steve
    in reply to BK2018

    Make sure you enable the DRC's under Analyze - Analysis modes (in CM) then Design for Fabrication and turn them all on. Yo also need to ensure that the ruleset you have created is applied to the PCB so make a ruleset under DFF Constraint Set - Silkscreen then this is applied under the Design - Silkscreen section.

  • BK2018
    in reply to steve

    I think I'm missing a silk to silk parameter because over 2,000 drc's are reported for silk problems (I usually let the board house tend to the clipping) but the overlapping refdes's are not flagged. I purposely placed two refdes's on top of each other and updated the DRCs but no markers on them.  I also opened the Color Dialog and enabled all DRCs.  The DRC report (clicking on the yellow sqauare) only shows VIA and PIN violations.

    Any ideas on what I might be doing incorrectly or is there yet another way to get the DRCs to include refdes overlapping refdes?

  • steve
    in reply to BK2018

    No your not missing something. In the base levels of OrCAD and Allegro the Silkscreen checks are limited to text and lines overlapping pins and vias. For more advanced checks you would need to look at an Allegro Venture license which does look at many more objects including text overlapping. There is a free skill app called autosilk utils which was written by Dave Elder and does cover what you want for free. Have a look at the PCB Skill forum and you should be able to find and download it from there.

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