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disabling annotate/back annotate constraints from capture to/from Allegro

Lennie

I have a schematic with no constraints set.  I swapped some pins in Allegro and back annotated the pcb file to capture. This added the constraints from the pcb file to the schematic. If I update the constraints in the pcb file and then load a new netlist the older constraints are loaded into the pcb. Is there a way to load a new netlist without loading the constraints ?

  • C Shiva

    Once you back-annotated, the constraint file will get attached to schematics and will be loaded again to board file every time you doing netlist import. To avoid loading of old constraint, before doing netlist, export the updated constraint which will save with extension of .dcf. Once imported the netlist, import the updated constraint and it will replace the old constraint loaded along with netlist import.

    HTH

    Regards,

    Shiva.

  • Wild

    If I understand you correctly:

    You don't want to pass Electrical constraints from the schematics to the layout.

    Simple solution:  In the Create Netlist Dialog box choose setup:

    Under the setup dialog there is a setting:

    Ignore Electric Constraints.  Check this box.

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