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 how to make PRBS7 stream in ADE simulation? 

Last post Mon, Oct 20 2008 11:42 AM by skillUser. 1 replies.
Started by Sung 15 Oct 2008 09:57 PM. Topic has 1 replies and 3639 views
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  • Wed, Oct 15 2008 9:57 PM

    • Sung
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    • Joined on Thu, Oct 16 2008
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    how to make PRBS7 stream in ADE simulation? Reply

    In hspice, PRBS7 (pseudorandom binary sequence) can be made by using LFSR command.

    In spectre, how can i make PRBS7 stream?

    There is a cell of which name is rand_bit_stream in ahdlLib library.

    Should i use this cell? Please tell me how.

    Thank you in advance.

    • Post Points: 20
  • Mon, Oct 20 2008 11:42 AM

    • skillUser
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    • Joined on Fri, Sep 19 2008
    • Austin, TX
    • Posts 2,569
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    Re: how to make PRBS7 stream in ADE simulation? Reply

     Hi "Sung",

    The "rand_bit_stream" cell in the ahdlLib library has both spectreHDL and VerilogA representations; you can instantiate the symbol in a schematic and use it in your design that way.  When you netlist, you will pick up either of the versions mentioned depending on your switch view list or your configuration (using the Hierarchy Editor) which will control which view is used by the netlister when expanding the design. When you place an instance of the rand_bit_stream, you can supply various parameters to it, such as the logic high and low voltage levels, the period and the risetime and falltime. The "seed" parameter can also be supplied - since it will always default to the same value, thr pseudo-random sequence will be repeatable from one simulation to the next.

    I hope that this answers your question.

    Regards,

    Lawrence.

     

    • Post Points: 5
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Started by Sung at 15 Oct 2008 09:57 PM. Topic has 1 replies.