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How to get the physical cset of a net using SKILL

soll

Hello !

I am trying to get the physical cset assigned to a net using SKILL.

I tried using this : net->prop->PHYSICAL_CONSTRAINT_SET

Unfortunately, if the net doesn't have a physical cset assigned (it is using DEFAULT) or if the cset is assigned to a class that contain the net, the property isn't added to the net.
So the only nets which have this property are the nets that have a cset directly assigned (basically 0 in most of my designs).

I have gone through the axlCNS functions but didn't found a match.

Does anyone have an idea on how to do this ? Thank you very much !

Parents
  • mahimag
    0

    Spacing_Constraint_Set and Physical_Constraint_Set are properties that get assigned when CSet is referenced on any net. we can extract and disply this property, 

    Try following lines of SKILL:

    axlClearSelSet()

    axlSetFindFilter(?enabled '("noall" "nets"))

    axlSingleSelectName("NET" "A0")

    myprops = axlDBGetProperties(car(axlGetSelSet()) '("user" "allegro")

    BGA_SPACE is the CSET, output value stored in myprops:

    ((LOGICAL_PATH "@demo_m.root(sch_1):a0")
    (SPACING_CONSTRAINT_SET "BGA_SPACE")
    )

Reply
  • mahimag
    0

    Spacing_Constraint_Set and Physical_Constraint_Set are properties that get assigned when CSet is referenced on any net. we can extract and disply this property, 

    Try following lines of SKILL:

    axlClearSelSet()

    axlSetFindFilter(?enabled '("noall" "nets"))

    axlSingleSelectName("NET" "A0")

    myprops = axlDBGetProperties(car(axlGetSelSet()) '("user" "allegro")

    BGA_SPACE is the CSET, output value stored in myprops:

    ((LOGICAL_PATH "@demo_m.root(sch_1):a0")
    (SPACING_CONSTRAINT_SET "BGA_SPACE")
    )

Children
  • soll
    0 in reply to mahimag

    Hello and thank you for the reply. The problem is that the property doesn't exist on the nets if the constraint set is assigned to a class to which the net belong... I just tried, using axlDBGetProperties() and I don't get the cset either, I only get the LOGICAL_PATH.

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