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 Strange behavior of constraint manager for instance bus 

Last post Thu, Nov 10 2011 7:17 PM by Rushang. 0 replies.
Started by Rushang 10 Nov 2011 07:17 PM. Topic has 0 replies and 1084 views
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  • Thu, Nov 10 2011 7:17 PM

    • Rushang
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    • Joined on Tue, May 17 2011
    • Posts 2
    • Points 25
    Strange behavior of constraint manager for instance bus Reply
     Hi

    I am trying to create constraints on a top level cell which contains some instance buses in it.
    for nets in the top level and for nets in subcell which are not bused instances, the selection works fine and I am able to create constraints correctly. However if I go down an instance bus and select a net from there, when creating constraint for that net at top level cell it creates constraint with member name 'a' and not the actual name.

    For example,

    Top Cell: MyTopCell
    sub cells: subcell1 -> i1, subcell2 -> i2<7:0> (instance bus)

    Creating constraint on i1/net1 for MyTopCell works fine
    Creating constraint on i2<3>/foo for MyTopCell results in out-of-context constraint created with net name as 'a'

    in CIW I see following message
    *WARNING* (CMGR-1808): Constraint member of type net is out-of-context because net 'a' does not exist in the original schematic design hierarchy.

    Is this intended behavior of constraint manager or a bug in tracing hierarchy for instance bus ?

    Thanx,
    Rush
    • Post Points: 5
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Started by Rushang at 10 Nov 2011 07:17 PM. Topic has 0 replies.