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Which takes priority?

tmd63

If you specify a constraint region that has a zero line width and spacing on an inner layer. But the default line width and spacing is 0.3mm for all layers. Why does the constraint region reduce the line width and spacing to 0 (Zero)? Does the specified widths and spacing go to the smallest or is 0 (zero) a special case?

  • oldmouldy
    0

    This is down to the Constraint Object Hierarchy, basically Region wins in this case. The hierarchy is documented in "Working with Constraints" in the Online help, and in the Constraint Manager User Guide available from the Cadence Support site.

  • tmd63
    0 in reply to oldmouldy

    I was just wanting confirmation that 2 overlapping regions with different constraints would revert to the smallest setting if a larger setting region is overlapping the smaller on part of its area (shapes are rectangles and could overlap in a corner etc)

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