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Doe's this 'dist' constraint is legal?

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Hello,

 I tried to use the following constraint (dist) which I'm not sure is syntatically legal.
Anyway, the NC simulator compiled it without warnings but it didn't work as expected in simulation:

cmd_kind dist { {CFG_WR, PGM_WORD, PGM_PAGE, READ_PAGE, READ_WORD} := 10, SW_RESET := 1};

In simulation I got only SW_RESET cmd kind.

The alternative is to explictly define weight for each item of the {} group which is really not comfortable.

Does anyone know if by SV LRM this should have worked?

Thanks,

 

  • I think you wanted to use square brackets instead of curly ones, around the range:

    cmd_kind dist { [CFG_WR, PGM_WORD, PGM_PAGE, READ_PAGE, READ_WORD] := 10, SW_RESET := 1};

    And I'm assuming you had this inside a constraint block or "randomize() with" construct...

  • Hey StephenH, Are sure the syntax you suggested is legal? I tried that already before and the Compiler was expecting ':' meaning [a:b] and not a list. 

  • Yes, sorry, I misread your original question.

    The LRM doesn't showany examples of what you're trying to do. The ranges are always contiguous, as in:

    x dist { [100:102] := 1, 200 := 2, 300 := 5}

    Also, the formal syntax suggests that the range must be in the form [a:b] and not a list of non-consecutive numbers, so I guess what you wanted to do is not legal according to the LRM.

     

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