On various parts, sometimes power is called VCC, and on others it is VDD.
The same thing happens with ground.  Sometimes it is VSS and sometimes it is
GND.

Is there any significance to this?

The reason I ask, is that in doing ERC's on shematics, it sometimes
complains like this:
"WARNING: Sheet 1/1: POWER Pin U$1 VSS connected to GND "
"WARNING: Sheet 1/1: POWER Pin U$1 VDD connected to VCC."

Are there some standard ways of dealing with this.  I am using Eagle CAD,
but I suspect this comes up whatever package you are using.

I understand that this is just a warning, but I would like to be able to ERC
with no warnings.

Bruce Partridge
http://www.rebreather.ca
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