Deleting diff pairs in constraint manager

Maybe try it a different way.

On the tool bar in the pcb editor go to "Logic > Assign Differential Pair. In the window select the diff pair name and click on it so it is highlighted. Click Delete button to remove it then hit apply then ok.

Possibly that should work. FYI you can also create diff-pairs in that window too.

I tried what you suggested but I receive this message when selecting the diff pair name I want to delete. "Only user defined diff pairs can be edited."

Thanks

Hi, Let me ask how the diff pairs were defined on your design. Were they defined in the schematic or directly on the board. If done in the schematic using capture by any chance were you possibly using the capture constraint manager ?.

If done this way maybe just remove them in the schematic and re-generate your netlist and update the board.

By what you write it sounds like the diff pairs are locked in some fashion. Other things you can try is launch allegro as an administrator and do a database check to make sure there is no corruption with the database.

Let us know what you find....

Hi, Let me ask how the diff pairs were defined on your design. Were they defined in the schematic or directly on the board. If done in the schematic using capture by any chance were you possibly using the capture constraint manager ?.

If done this way maybe just remove them in the schematic and re-generate your netlist and update the board.

By what you write it sounds like the diff pairs are locked in some fashion. Other things you can try is launch allegro as an administrator and do a database check to make sure there is no corruption with the database.

Let us know what you find....

The diff pairs were originally defined in Allegro Pcb Editor. We have tried fixing this issue in the schematic by changing the netnames in the schematic generating a new netlist but that did not work. We use EDM to store our designs, etc so not sure what I would need to do to have administrator rights. It seems odd that we cannot change the netnames in the schematic and then delete the diff pair name in the layout side to fix this issue. Seems like the nets are fixed in some way, I had unfixed the nets and symbols that the nets are connected to but it did not work.I will keep trying. Thanks for the assistance.

In addition, the nets are not user defined, not sure what that means. That is why I cannot delete the diff pair name in layout by doing this command sequence.  Select Logic from the top of the page, Select Assign Differential Pairs, scroll to the Diff pair name which has the nets I want to delete as a diff pair. I receive a message that on user defined diff pairs can be edited.