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Altera_Forum

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03-11-2011
11:56 AM

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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
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Altera_Forum

Valued Contributor III

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03-11-2011
08:20 PM

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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
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Altera_Forum

Valued Contributor III

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03-11-2011
11:24 PM

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

For more complete information about compiler optimizations, see our Optimization Notice.