Comment 3 for bug 1681592
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| LaunchpadLoginDefectReport (nagle-1) wrote | #3 |
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0e1f616
(Get the code!)
It may be a duplicate of that DRC bug. Not sure whether the autorouter cut it too close or
DRC generated a false alarm. Check my math here, please. See previously attached picture
for situation and numbers below.
Track near via error message:
(111.580mm, 112.014mm): Track 1.000 mm (a vertical track)
(110.335mm, 113.229mm): Via 0.600 mm
Track width 1 mm. Track clearance 0.5 mm. Via diameter 0.600 mm
111.580mm - 110.335mm = 1.2450 mm between center of track and center of via.
1.2450mm - (1.0/2mm) - (0.600/2mm) = 0.4450 mm clearance between track and via.
0.5mm clearance allowed - 0.4450mm clearance actual = 0.0550 mm too close.
That says DRC is right, there really is an overlap. The autorouter is wrong. Is that correct?
Again, please check me on this.
(Making a trivial change to the board elsewhere and re-running the autorouter resulted in a
different layout that passed DRC.)