[Open-graphics] fifos and metastability

[Nicolas Boulay]

Does metastability still exist today ?

Metastability have a exponentialy decreasing probability for a given
length. The idea is that the time constant in the exponent for the
last process (<0.25µm) are very small (ps ?) and don't affect the
design anymore.

2007/4/10, Timothy Normand Miller <theosib at gmail.com>:
> I've posted to SVN a new fifo design.  It's kinda wasteful, but it's
> designed for very high clock rates.  It's an async fifo (meaning that
> the two ends are on different clocks), and the cross-domain
> communitation is one-hot (rather than gray-coded).
>
> When I posted the original one, someone was kind enough to perform an
> analysis to determine if RAM contents would also suffer from
> metastability.  I think this one will have the same problem, so I was
> hoping that same kind person would please have a look at this one.
>
> https://svn.suug.ch/repos/opengraphics/main/trunk/rtl/fifos/onehot_fifo_32.v
>
> Thanks!
>
> (Oh, it doesn't quite work right yet.  I'm in the process of debugging it.)
>
> --
> Timothy Normand Miller
> http://www.cse.ohio-state.edu/~millerti
> Open Graphics Project
> _______________________________________________
> Open-graphics mailing list
> Open-graphics at duskglow.com
> http://lists.duskglow.com/mailman/listinfo/open-graphics
> List service provided by Duskglow Consulting, LLC (www.duskglow.com)
>