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Via constraints enforceability

p94todorov

Hello,

I've been trying to figure out why some of the constraints defined for a via are not enforced when Enforce is selected in the DRD Options.

My personal observation is that this happens when there is minSpacing constraint defined for the via along with minParallelViaSpacing one and the numerical value for the second is greater.

A sample code would look like this:

cst1 = cstCreateConstraint(cstGroup "minSpacing" list("myLayer")  minSpace  nil t nil myCstName1)

cst2 = cstCreateConstraint(cstGroup "minParallelViaSpacing" list("myLayer")  diffNetSpace  '((exceptConnectivityType "exceptSameNet")) t nil myCstName2)

where diffNetSpace > minSpace.

According to the documentation, both constraints are expected to be enforced since g_isHard is set to t and are added as first members in the constraint group.

I was also wondering where I can read more about the available choices for t_constraintDefName, l_params and what actually sits behind them.

The Notify features work, but the constraints are not enforced. I can see similar behavior for the minWidth constraint as well.

It will be much appreciated if you can point me to some further documentation and whether this is an expected behavior. I am working with cadenceICADVM/20.10.240.

Regards,

Petar

Parents

  • Hello,

    had to deal with some other constraint related issues and still couldn't find enough documentation about the available constraint definition names.
    Can someone point me to such information, so I can better understand what is already available?

    Regards,

    Petar

Reply

  • Hello,

    had to deal with some other constraint related issues and still couldn't find enough documentation about the available constraint definition names.
    Can someone point me to such information, so I can better understand what is already available?

    Regards,

    Petar

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