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How to measure Net Etch Length considering vias in vertical direction using Allegro？

momo1982

Hi all,

I found that Allegro can't measure net length with via height between the routing layers, which is illustrated in following figures. These two connections actually have a difference of (board thickness * 2), but allegro seems just measure the length in horizontal directions, ignoring the height coming from via.

Total etch length 316 mil here:

Total etch length still 316 mil here. But actually there is a (2*Board Thickness) here which should be considered.

Is there any method in allegro that we can get the REAL net length including the trace length, and via height between the routing layers?

Thanks so much!

  • If you mean OrCAD Professional when you say Professional then this does not include this option.

    If you have PCB XL, PCB GXL or the High Speed option with the PCB Designer product then you have the Z-Axis feature which includes the depth of the vias and pins in delay calculations. To see if you have it in the Allegro menu:

        Setup -> Constraints -> Modes, select he Electrical Options tab you should see Z Axis Delay group, check the "Include" check box.

    If you do not see Z Axis group under this tab then you do not have this option include with the products you have.

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