Sometimes I noticed when you do operation of connecting global power to pins of instances and then do Check operation it says that power is not connected to some instances.
I am curious is it something normal? Does it mean that specific instances are kind of optimized? Or should I be worried about it?
All my instances have VDD! and GND! power pins, and I defined global VDD! and GND! power. In some designs for example, when I choose that operation and then do the Check, it says nothing. i.e. everything is connected, but on another designs (it actually depends on a code) it gives warning that some pins were not connected.
How does that thing usually work out?