On Wed, 20 Jan 2016 14:13:11 +0000
"Poul-Henning Kamp" <p...@phk.freebsd.dk> wrote:
> >The test results showed a quite more
> >detailed structure with few delays over 100ps and most being between
> >20ps and 80ps. Interestingly, some were close to 0ps, for which
> >we have no explanation good explanation.
>
> Any on-chip PLL's with "spread-spectrum" to fudge EMI tests ?
Nope, the cyclone4 PLLs do not support spread spectrum.
Also, the 0ps positions were stable (suggesting some FPGA
internal feature to be the cause), but they weren't evenly
spread over the delay chain.
Attila Kinali
--
It is upon moral qualities that a society is ultimately founded. All
the prosperity and technological sophistication in the world is of no
use without that foundation.
-- Miss Matheson, The Diamond Age, Neil Stephenson
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