The general differences between a Net Class and Net Group are:

• A Net Class is group of nets specific to a particular domain (Physical, Spacing and Electrical)
• A Net Group is a group of nets that common across all domains

You could create a common Net Group then assign a Constraint Set to drive basic rules:

• Net Group NG1 could have a Physical Constraint Set assigned in the Physical domain
• Net Group NG1 could have a Spacing Constraint Set assigned in the Spacing domain
• Net Group NG1 could have a Electrical Constraint Set assigned in the Electrical domain

Implications?  Constraint Region Rules and Class to Class Rules cannot be assigned to Net Groups

• Physical domain: You can specify Physical rules for a Physical Class inside and/or outside of a specific Constraint Region.
• Spacing domain: You can specify Spacing Class to Class rules when different Spacing Classes come in contact with each other inside and/or outside of a specific Constraint Region.

In addition, Net Classes are domain specific groups so if you wanted to have one larger group of nets to control Spacing rules and a sub-set of those nets to control Physical rules it can be easily done with Net Classes.

Think of Net Groups as a higher level group of objects to organize interfaces.

Hope this helps,
Mike Catrambone

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