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I think maybe when modules are concerned the message should be changed to be a little more clear exactly what it means.
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So whilst technically it's not a one pin net as in the module it connects elsewhere, I think in this instance it's telling you it's not connecting anywhere else outside of the module. Project C: 23 sheets, 4193 pins, 709 nets: ERC takes 6 minutes. C1 & C2 may be changed for optimum sensitivity. I compared it to eagle and diptrace, using the same schematic, which both need about 1 to. However for transistors you can load models from external files (usually. As you've brought them out and connected them to DGND they'll have that DGND name but as there is nothing else in that level of hierarchy it's complaining because you brought out a net and connected it to nothing else. The External Crystal holes are for Crystals that do not fit in the pins. 28 DipTrace Tutorial When pin to pad connections are.
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So, I haven't used modules for a long time because of their limitations but in order to keep net names within a module unique (as you could instantiate the module many times), within the module the nets get the names with the convention : so I think when you look in the board the DGND connections for parts within the module, if you didn't have the external DGND connection would be :DGND. I hadn't noticed as you are using the coloured colour scheme and all the colours being different from what I normally see threw me and I didn't spot it was a module not an IC.
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