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Altera_Forum's avatar
Altera_Forum
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15 years ago

Simple RNG for the DE2 board

I need a process to produce a seemingly random integer, is it possible to use the rand function and if so, what library do i need to use?

Thanks for any help

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    What kind of statistics? Uniform distribution, or normal distribution? A uniform distribution is fairly easy to generate using a linear feedback shift register. A normal (Gaussian) distribution can be generated by summing multiple LFSRs, or LFSR samples, or by filtering an LFSR. It depends on the rate at which you want to generate the random data.

    Alternatively, you can always write a block of data to RAM, and then process that data. This method is nice for testing identical data in MATLAB, Modelsim, and in hardware.

    Cheers,

    Dave
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    15 years ago

    Fixed it by using a 8 bit counter at 50 MHz and taking out the bit code when my state machine resets