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<h1>vndecorrelator</h1>

<h1>Introduction</h1>

<p>A Verilog implementation of a von Neumann decorrelator, generally called
a conditioner or whitening function. This tiny module consumes entropy
bits and outputs decorrelated bits.</p>

<p>The <a href="http://www1.spms.ntu.edu.sg/~kkhoongm/Entropy.pdf">Von Neumann decorrelator</a>
consumes pairs of bits and outputs bits based on the pattern in th bit pairs:</p>

<ul>
<li>00 and 11: No output of a bit.</li>
<li>10 and 01: Output the first bit in the pair</li>
</ul>

<p>In the best case with random bits, the output bitrate will be 1/4. For
heavily biased input bits, the rate will be much slower. When used with
a broken entropy source that is stuck at zero or one, no bits will be
emitted.</p>

<p>This implementation operates on streams of single bits and creates pairs
internally.</p>

<h1>Status</h1>

<p>Implementation done. Tested in FPGA designs and works.</p>
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