Re: [oc] Re: Opencores Design Guidelines

["Bill Simpson" <yornik@iname.com>]

I believe, "greatly reduces failure probabity because of metastability states" is more exactly than "prevents".


-----Original Message-----
From: "Damjan Lampret" <lampret@opencores.org>
Date: Sun, 11 Nov 2001 04:31:26 +0100
To:  <cores@opencores.org>
Subject: Re: [oc] Re: Opencores Design Guidelines


> Rudi,
> 
> is this ok:
> 
> >>
> Strong Recommendation: Signals that cross different clock domains
> should be sampled twice in destination clock domains (double sampling is
> a MUST). See synchronizer_flop in OpenCores CVS in module common.
> 
> Prevents meta-stability state.
> 
> To make netlist verification easier, you should use one module (i.e. sync.v,
> sync.vhd) that will have in, out and clock interface and the first flip-flop
> should
> have a unique name as this flip-flop will have timing violation. If it has
> unique
> name, it is easier to trace it and "change" it to not pass X's.
> 
> Also it should be clear that you pass ONLY the control signal and not the
> data
> bus etc.
> <<
> 
> For the record, I did not write 3.3.1. If above is not ok, send me a text
> that you want to see as 3.3.1. The only thing I ask to refer to synchronizer
> flop in the CVS.
> 
> regards,
> Damjan
> 
> ----- Original Message -----
> From: "Rudolf Usselmann" <rudi@asics.ws>
> To: <cores@opencores.org>
> Sent: Sunday, November 11, 2001 2:18 AM
> Subject: Re: [oc] Re: Opencores Design Guidelines
> 
> 
> > On Sunday 11 November 2001 02:32, you wrote:
> > > Hi Richard,
> > >
> > > I'm very sorry but I have never received any email from you. If I would,
> > > I'd reply for sure and include your suggestions and corrections. Can you
> > > please send me your email again. Thanks.
> > >
> > > regards,
> > > Damjan
> >
> >
> > I know you received my email, but you didn't bother to fix those
> > things either ...
> >
> > (see section 3.3.1 for a major WRONG/BOGUS recommendation !)
> >
> >
> > Cheers,
> > rudi
> > --
> > To unsubscribe from cores mailing list please visit
> http://www.opencores.org/mailinglists.shtml
> >
> 
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> 
> 

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