In Altium, it seems no connect (NC) pins in a given IC create a net that wants to connect them all together. I've been looking for some parameter we may have set when the part was created that forces a NET on these pins, but haven't found one yet. Anyone know why this is happening?
It generates a DRC unless these NC pins are tied together. There is no net on these pins on the schematic.
I have IC symbols on a schematic that have NC pins. These pins are identified as NC via the special DRC marker (i forget what it is called) that identifies them as NC nodes). On the PCB layout, these want to be connected together with a net (the ratsnest lines show up for these, connecting them together), even though the 'Not connected" symbol or marker is placed on the NC pins. It could be that the issue is that the pins on the schematic symbol are grouped symbolically into a single pin, with the pin numbers listed with commas. However, this is a legitimate way of grouping similar pins together (VCCs, GNDs, etc) where the symbol shows just the one pin, and all the pins associated with that function or connection (ie, VCC, GND, NC, etc) are listed in the properties,comma separated. The NC pins on the schematic have the no-connect symbol attached to them, and there are not nets tied to those pins on the schematic.