<html><head></head><body><div class="gmail_quote">Am 17. Juli 2015 22:08:04 GMT+08:00, schrieb "Joachim Strömbergson" <joachim@secworks.se>:<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<pre class="k9mail">-----BEGIN PGP SIGNED MESSAGE-----<br />Hash: SHA256<br /><br />Aloha!<br /><br />Picking up an old thread, sorry for a slow reply.<br /><br />Bernd Paysan wrote:<br /><blockquote class="gmail_quote" style="margin: 0pt 0pt 1ex 0.8ex; border-left: 1px solid #729fcf; padding-left: 1ex;"> However, I think I was the only one who actually did measure the<br /> jitter of the ring oscillators, and the current design doesn't allow<br /> end users to run that test, so we fail on that, too ;-).<br /></blockquote><br />The current design allows you to read out the raw outputs from the<br />oscillators. What should we add more to provide measurement of the<br />jitter of the oscillators?<br /><br />- -- <br />Med vänlig hälsning, Yours<br /><br />Joachim Strömbergson - Alltid i harmonisk svängning.<br /><hr /><br /> Joachim Strömbergson Secworks AB joachim@secworks.se<br /><hr /><br />-----BEGIN PGP SIGNATURE-----<br />Comment: GPGTools - <a
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SIGNATURE-----<br /></pre></blockquote></div><br clear="all">You need a reliable timing base for the sampling. When I measured the jitter, I sampled every 16 cycles with a 50MHz clock, and filled 512 samples into a buffer. That sort of thing needs some hardware support when the frontend CPU is not deterministic enough. <br>
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