Community
Fusion Electronics
Working an electronics project and need help with the schematic, the PCB, or making your components? Join the discussion as our community of electronic design specialists and industry experts provide you their insight and best practices.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Differential pairs width and clearance does not work according to the net class rules!

1 REPLY 1
Reply
Message 1 of 2
fahad.bhatti
64 Views, 1 Reply

Differential pairs width and clearance does not work according to the net class rules!

Hello,

 

I am facing difficulty in routing differential pairs. I am using the widths and clearances from MULTICB.

 

My differential pairs are setup properly with _P and _N affixed to the end. (BTW Fusion fails to recognise them if I have 0_P or 1_P as a prefix!!!). Fusion is recognising my differential pairs but not routing them according to the values I need! I read another post that specified that if my DRC is set to a larger value than my netclass rules then the DRC has a higher priority than the netclass rules.

But even after catering to these rules, the track width is NOT according to the netclass I have created. What is the point of netclasses if the DRC is going to ignore these rules set for specific groups of signals? My net classes are currently set as follows and I have attached the drc files exported from fusion.

 

fahadbhatti_2-1714049012839.png

 

This area is so ambiguous with little to no information available officially from AutoDesk! Please help.

@jorge_garcia2

 

Labels (1)
1 REPLY 1
Message 2 of 2

Hi there - this is definitely an area that could use improvement and causes a lot of confusion right now.

 

Could it be that the widths you have specified in the DRC dialog are more strict than the ones you have in the net class settings?

Pieter-Jan Van de Maele
Senior Engineering Manager, Fusion Electronics

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums