Differnce between net class and net group.

you can refer to the following site:

https://community.cadence.com/cadence_technology_forums/pcb-design/f/pcb-editor-skill/44015/create-a-new-constraint-group-or-constraint-class

Hi masamasa

Good Day!....

thanks for the reply...

I have already read the post, but after studying it, I am even more puzzled. Could you please assist me in better understanding it?

Assume, You have created Net class in Electrical constriant, you have to set the constriants with in the electrical constriants set.

Assume, you have created Netgroup in electrical constriant, This can be used with Electical, Physical, Spacing, Same net spacing constriants sets.

here are the screenshots. I have created  Net-class as 'TEST' and 'NG2' as a Net-group, TEST stays in  with electrical constraints set only but NG2 will have it physical, spacing and other constraints set as well.

now i moved to physical constriants set, we can set physical constraints for NG2 net group, here is the image.

Net group can be member of net class but net class cannot be a member of netgroup because net class is local and netgroup is global. Net classes is applicable when you have a specific requirements to the nets.

Please refer below article for more differences.

Article (20460969) Title: What is the difference between a Net Group and a Net Class in Constraint Manager?
URL: support.cadence.com/.../ArticleAttachmentPortal

Hi aniju

Thanks for the reply...

I got a basic understanding of the calss and groups.

According to what I understand, the net group needs to be included within the net class.

Kindly correct me if I'm mistaken!

its not always netgroup should be included in the netclass, if you have specific requriements to those nets, you may include it in the netclass.