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Relative Delay properties from Allegro to CIS

JackieOh

Hi all,

Trying to get some relative delay properties from Allegro back into CIS and it doesn't seem to be working using back annotation. Does anyone know how this works? We are using V16.01.

Thanks,

Jackie Oh!

  • oldmouldy

    A couple of things.

    These properties get back annotated to Flat Net properties in DE CIS.

    DE CIS has no support, or comprehension, of XNETS, if you applied you constraints to XNETS, DE CIS won't get them.

    Otherwise, you may need to raise a Service Request to get this investigated.

  • Khurana

    Relative propagation delay properties do not back-annotate to OrCAD Capture since in Allegro you have an object called 'match group' and OrCAD Capture has no understanding of what a match group is i.e. OrCAD Capture understands only single ended nets (it understands pin pairs but only for assigning pin pairs for propagation delay property for forward annotation).  What you might want to do is specify the relative propagation delay property at the net level so that the property value appears in blue in Constraint Manager (as supposed to black when it's inherited from the match group down to net or pin pair level).  Then invoke back-annotation.  Make sure that the .cfg file contains the property name with value set to YES.

  • JackieOh

    Thanks very much for the answers!

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