Tool: Allegro PCB Performance option L Ver16.1
eg:I set net width for a differential net +X to 15mil, and maintain width for net -X as 8 mil in the constraint manager. But while routing the -X net's with is automatically changing to 15 mil, same as +X and the change is not showing in the constraint manager.
Is it bcz the tool is automatically default set to maintain same with for diff nets?
Yes, the diff pair engine expects like widths.
I am very curious to know why you want to do line widths like this for diff pairs?
You can remove the diff pair prop and instead route as a matched pair and then it doesn't care about width.
In reply to redwire:
Thank you redwire, for your comments for both of my posts. I was trying to help my colleague.
we were just trying "width changes". Then we noticed that particular property, that's all.
In reply to rinj:
Idon't know if you have solved this. but one way to solve this,is to set MAX LINE WIDTH on each net and then route it as a group. Then it behaves like a diff pair. You can change the isolation by right click.