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NCSIM SV constraint Fatal error

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Hi Cadence,
 
I have written a case about constraint.
Class A (Sequence have some command) composite Class B(command).
And Class A and Class B have some constraints.

ncsim: rnc_bool.h:110: rnc_bdd_node& rnc_bool_node::get_bdd_node(): Assertion `_bdd_node_valid' failed.

ncsim: *F,INTERR: INTERNAL ERROR
Observed simulation time : 25 NS + 0
-----------------------------------------------------------------
The tool has encountered an unexpected condition and must exit.
Contact Cadence Design Systems customer support about this
problem and provide enough information to help us reproduce it,
including the logfile that contains this error message.
  TOOL: ncsim   06.10-p001
  HOSTNAME: shpc024
  OPERATING SYSTEM: Linux 2.4.21-32.ELsmp #1 SMP Fri Apr 15 21:17:59 EDT 2005 i686
  MESSAGE: Unexpected signal #6, program terminated (null)
-----------------------------------------------------------------

Best regards,
Davy

Originally posted in cdnusers.org by davyzhu

  • Another fatal error,
    I guess all the fatal errors are caused by constraint solver.


    Error:
    terminate called after throwing an instance of 'std::bad_alloc'
    what(): St9bad_alloc
    ncsim: *F,INTERR: INTERNAL ERROR
    Observed simulation time : 25 NS + 0
    -----------------------------------------------------------------
    The tool has encountered an unexpected condition and must exit.
    Contact Cadence Design Systems customer support about this
    problem and provide enough information to help us reproduce it,
    including the logfile that contains this error message.
    TOOL: ncsim 06.10-p001
    HOSTNAME: shpc024
    OPERATING SYSTEM: Linux 2.4.21-32.ELsmp #1 SMP Fri Apr 15 21:17:59 EDT 2005 i686
    MESSAGE: Unexpected signal #6, program terminated (null)
    -----------------------------------------------------------------


    Best regards,
    Davy


    Originally posted in cdnusers.org by davyzhu

  • Hi

     Even we face the same .Can somebody give guidelines in making constraint .sometimes randomize function takes 10 minutes to find solutions

    Thanks

     

    Prabhu,G


    Originally posted in cdnusers.org by prabhu_G

  • Hi Prabhu,

    I guess you may use some layers of implication -> to accelerate the constraint solver.
    Anyone have some constraint trick to share?

    Best regards,
    Davy


    Originally posted in cdnusers.org by davyzhu

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