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I placed a few vias manually. I get "Un-Routed Net Constraint."

How can I fix that?

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  • 3
    \$\begingroup\$ If this is just a trace going from one layer to another, why not just use a single large via? Why are you trying to use several smaller ones? And I don't use Altium, but in all software I have used, after placing them, you will have to right click and manually assign a net to the via \$\endgroup\$ – MCG Jun 17 at 14:56
  • \$\begingroup\$ In Altium, a newly placed via is assigned to not connected to any net. Select the via, right click and select the net to attach to. \$\endgroup\$ – Peter Smith Jun 17 at 15:00
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    \$\begingroup\$ @MCG The image shows they've already assigned the correct net to the via. And multiple small vias can provide a lower resistance path than one big one (which is mostly air in the middle rather than copper). \$\endgroup\$ – The Photon Jun 17 at 15:00
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    \$\begingroup\$ The copper the vias are in is attached to M3- but that copper is not attached to the main part of M3- as far as I can see, so it is an unrouted net from the point of view of the tool. \$\endgroup\$ – Peter Smith Jun 17 at 15:33
  • \$\begingroup\$ Sometimes Altium is a bit odd in what it calls out as the unconnected net, but in your second picture, you have an isolated island of M3- on the pad of that (assumedly) capacitor... is that after you deleted some of the top layer trace? \$\endgroup\$ – Krunal Desai Jun 17 at 21:34
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The Via not assigned to any net(M3).So, you getting "Un-Routed Net Constraint" Error.

You can assign the net (M3) by following steps

  1. Select all Vias, which is not assigned any nets.

For that,

 a.**Right click on the via->Find Similar Objects**

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 b.**In the Find Similar Objects window, Modify NoNet -> same-> OK**

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  1. Now all unassigned Via selected and the PCB inspector window will appear.

There have to assign the Net name(M3) from No Net.and close the window. enter image description here

Now, The Error cleared.

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