When you place a NetGroup block on a page, the block consists of a number of different parts and definitions that are different from a hierarchical block. The parts help in using the NetGroup for connectivity. These definitions help to understand the constituent members of the NetGroup.
NetGroup Entry/Exit Pin
When you define a NetGroup, you specify members of the NetGroup. You will then need to connect signals on your page to these members. On a NetGroup block these members appear as ports and are referred to as NetGroup pins. The nomenclature for a NetGroup pin is <NetGroupInstanceName>.<MemberName>.
NetGroup Pin
The benefit of a NetGroup is that you do not need to create as many exit points as the number of entry points. When you define the NetGroup, one exit point is created that holds the signals for all the entry points. This exit point is referred to as the NetGroup entry pin.
The NetGroup port displays the NetGroup instance name and the size of the NetGroup instance.
The Netgroup entry pin type should be output type only.
NetGroup Wire
When you connect the entry / exit pins of the NetGroup to a wire, you are effectively connecting all the signals that constitute the NetGroup into one wire. This wire is known as the NetGroup wire.