plane via/antipad clearance

Hi Giuseppe,

If you open the constraint manager tool, and go to the spacing constraints, you should be able to find the via columns under the “shape to” section. This is where you’ll find the values, sorted by layer, that you’re looking for. When the shape global parameters is set to DRC, this is the value that is used for the clearance. You can create different net groupings, constraint regions (areas), etc. to customize the values between different nets, or in diffeeent areas of the board, not just on a per layer basis. 

Let me know if you can’t find it there, and I’ll see if I can get some pictures to post for you. The table in constraint manager is large, but you’ll find it!

- Tyler

Tyler,

thank you for your suggestions and explanations ! I tried to go in the allegro constraint manager, under spacing constraint, i have found the column that says Shape To >> , but it shows All and there are three asterisks *** and no values ? DO you think I am doing something incorrect here ?

w/ regards,

Giuseppe

If you double click on the Shape To >>> column header, it will expand to show all the different other object types. Sorry, I forgot to mention that. You’ll see *** if there are multiple values. From there, if you want to edit the values, you might need to expand the layers to get to the layer that you want.

thanks ! I have found it ... The tools is excellent, but quite overwhelming for a someone like me who is not a daily user, would you reccomend a good document to get up and running so that I can make changes to design and look for what-if-scenarios ? I am looking at moving vias, changing antipad, moving diff pairs, and so and so forth.

Thanks again for your help,

Giuseppe