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Some questions by a beginner.

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I am studying e for verification. the following is my second practice, (the first is the xor example), and now I do not know how to continue this project, I post it here and hope somebody can give me some advice.

My DUV is an asynchronous FIFO, for simplicity I let the environment run in the same clock, and use sequence to generate random read/write stimulus. I attached what I did in attached file and my questions is:

1) because it purely random, it is hard to achieve fifo full, how can I do that?
2) If I want to test the asynchronous attribute, shall I need 2 sequences, if so, how should I do synchronization between 2 sequences?

3) An other question: is there any tutorial available for beginner to practice build the sturcture properly? I think the xor example is too primitive for this.

Thank you very much.


Originally posted in cdnusers.org by yschou

  • I am not able to view your attachments.

    You can control the random behavior by providing constraints to various elements of your sequence. Hence, you can control the random behavior.

    You can find good specman tutorial on the following links :
    1) asic-world
    2) specman-verification

    Regards,
    Nilay Goyal
    eInfochips Ltd.





    Originally posted in cdnusers.org by nilaygoyal

  • Interesting, I can not see your attachment either.
    As to not filling up the FIFO (and causing an overflow) - adjust your constraints so that you have 70% writes, and then 30% reads.  Similarly, to see FIFO empty (and force an underflow), reverse the constraints.

    I'm afraid I'm one of the few "dinosaurs" out there who have never used sequences (please don't yell at me, I just never had a chance to properly learn how to use them), but if you want to post your constraint generation section - I'm sure some other members will be happy to comment, and perhaps give me a chance to learn something :-)

    Cheers,
    Gery O


    Originally posted in cdnusers.org by geryo

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