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Constraint Manager Total Etch Length Green Box, Not Value

jmadsen

I'm using PCB Designer Professional, V17.4-027.  I have max total etch lengths set in the constraint manager.  Some traces show up as values, as they should.  This is good.  Some show up as green boxes; not as good.  A couple are definetly routed, but do not show up at all, such as USB2DM_UP, show below.  This is bad.  Why green boxes instead of values?  Why do some not show up at all?

  • excellon1
    0

    Hi

    Green box means the actual net is meeting the goal. So green box means those nets are 4000 mil in length. When you see numbers (Actual field) the system is telling you the current length of the net. The margin is the amount either plus or minus in order to meet the actual net length.

    It is usually a good idea to specify a minimum net length too.

    I had seen before the CM not turning to a green box even though the actual net length was met. It showed the correct length but would not update. Had to close the CM and re-launch it so it could read the values and update.

  • jmadsen
    0

    After finishing the layout and trying to figure out what was going on, I found that I would only get actual values in the constraint manager if I modified the trace since the last time I opened the layout.  If I close the layout and re-open it, I get either a green box or nothing at all.  Green boxes indicate that the constraints are met.  I tried to find a way to get it to re-calculate and show a value without modifying a trace but could not.

  • steve
    0 in reply to jmadsen

    You can select the netname and right click - Analyze which should update the values. This also works on Netclasses / groups or the complete design name.

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