Electronic – Altium 18 multi-board design. How to connect 2 PCB’s with a pin header

I once made a diode with a four-pin anode, all of which I wanted to connect together. You could connect all of the anode pins separately, but I would recommend giving them different pin names (i.e. 87a, 87b, 87c) and treating them as separate pins on the PCB layout. However, on the schematic, lay the three pins one on top of the other so it looks like just one pin. Altium will see a wire connected to the "one" visible pin as connected to all three pins, and will tell you to route all of their corresponding pads together. You will need to go into the pin editor on the schematic, though, and make sure you change the pin names and which pads they connect to. That's probably the most elegant solution.

It's quite simply that Saturn has no idea what chips/passives are connected to the target line. If you look at the 2nd example, your driving voltage is 3.3 volts and it couples 1.65 volts to a track that is effectively equi-distant between source and ground. It cannot produce an answer other than 50% of 3V3.

Any driving node on the target line is going to look like a few tens of ohms and this will decimate any cross talk and convert what would have been a cross-talked voltage pulse to a current sunk into the driver.