I found where I have moved a component slightly a caused a short
between ground an power. I got all that fixed. But every time I start
to run the power buss, I reach a point where pins are highlighted
green, but the rat lines disappear, and the DRC makes it impossible to
run a trace to the pin. I have to keep saving the layout, exiting the
program, and starting over. Even reloading the net list and displaying
the rat lines does not help. This is slowing things down quit a bit.
But I don't think I can build a 4 layer board at home, and with only
two layers, there is no ground an power planes, so I want the power and
ground lines thick and well laid out, so I don't want to rey
autorouting just yet. What I am doing wrong this time
There is one known shortcoming with PCB (iirc): if you create a "copper
island" somewhere,
that is a copper area not connected to anything with a know net, this
gets a hidden ID and
is not treated as undefined. So if you layout a strip of copper you
intend to become part
of e.g. ground later, once you want to connect it to a known ground you
have to turn off
auto-DRC for this one connection. As long as that area is not shorted to
anything else
the next rats-optimization should show no trouble.
Don't forget to turn on auto-DRC again after the deliberate "forced
shorting".
HTH, Armin
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