Different line width and clearance on different layers

[msauerpb]

Hi,
is it possible to define netclasses with different values for line width and clearance on different layers? Our PCB has DDR4 components and we have to route the signals width different parameters on top/bottom layer and inner layer.
Thank you for your help.
BR
martin

[paulvdh]

I think it can be done, but not with a net class (or not with net classes alone) but you need custom rules. In the link below I have collected some example of custom rules, and KiCad has some built in help for them too.

How to use the "Min_Width" Zone Property in Custom Rules?

Although it appears to have been renamed in the code to Minimum_Width, and the docs call it Min_Width. How can I make use of this? It looks like this can’t be used as a constraint, but only as a condition, which doesn’t really make sense to me. My end goal is to have some DRC to check minimum zone width. Say I have net classes for checking all my minimum track thicknesses, and one track is too thin. If I replace it with a zone with the same dimensions, the DRC error will disappear, but the prob…

Maybe it is possible to set up different net classes for different layers, and use custom rules to switch between them, but I am guessing here.