Re: [oc] Re: Opencores Design Guidelines

["Damjan Lampret" <lampret@opencores.org>]

Bill,

I haven't actually got the time to change the document. Don't worry, I will
put this in as well as other changes. Thanks.

regards,
Damjan

----- Original Message -----
From: "Bill Simpson" <yornik@iname.com>
To: <cores@opencores.org>
Sent: Sunday, November 11, 2001 3:21 PM
Subject: Re: [oc] Re: Opencores Design Guidelines


> 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
> > > --
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> > >
> >
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> >
> >
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