[SI-LIST] Re: METASTABILITY
- From: "Peterson, James F (FL51)" <james.f.peterson@xxxxxxxxxxxxx>
- To: arpad.muranyi@xxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 6 Jan 2006 05:49:16 -0700
Arpad,
a good point : a quick look for "metastability" in the index of my
half-dozen SI books didn't get many hits.
regarding "Most SI experts are not circuit designers" : you might be
surprised at how many of us old SI'ers are circuit designers, crossing a
clock domain or two in the past, and thus worry about metastability.
(actually, I love circuit design and use my SI skills as leverage to get
logic design opportunities - I bet I'm not the only one on this list who
does this.)
but seriously, since there is a SI-noise->timing->metastability
relationship, I think it's important for us to understand at least the
fundamentals of metastability (it's cause, how to fix it, and how to
calculate it's probability before and after the fix).
Jim
Honeywell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Muranyi, Arpad
Sent: Thursday, January 05, 2006 1:21 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: METASTABILITY
Thanks for the numerous replies, public and private.
I agree that there is a strong relationship between signals and
metastability in general. I guess the reason I said that I didn't see the
relationship in my first reply to this thread was because I was thinking of
signal integrity as the art of making sure that the signal is clean, has the
correct amplitude and slew rate, that it is timed correctly, along with
dealing with transmission line effects, terminations, cross talk, etc... to
avoid any possibilities for metastability.
In that sense an SI engineer is working on signal quality problems, not so
much on the metastability problem itself. The tricks an SI engineer uses to
solve these problems and the tricks a circuit designer uses to reduce the
metastability problem are quite a different world to me.
This is why asking an explanation for what the "concept of *METASTABILITY*"
is in an SI forum seemed inappropriate to me. Most SI experts are not
circuit designers, therefore may not be knowledgeable enough to answer this
question in depth.
Arpad
-----------------------------------------------------------
-----Original Message-----
From: Peterson, James F (FL51) [mailto:james.f.peterson@xxxxxxxxxxxxx]=20
Sent: Thursday, January 05, 2006 9:16 AM
To: Muranyi, Arpad; si-list@xxxxxxxxxxxxx
Subject: RE: [SI-LIST] Re: METASTABILITY
a good question, but I believe they are indeed related : a lot of signal
integrity problems are timing problems (if we had enough time, they =
wouldn't be signal integrity problems), some of those timing problems are =
problems because they cause a signal to slide inside the setup/hold timing =
boundaries of a flop, and this is where Metastability happens...=20
best regards,
Jim Peterson
Honeywell
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Muranyi, Arpad
Sent: Thursday, January 05, 2006 11:37 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: METASTABILITY
Maybe I am missing the point, but I don't see that metastability and SI =
are related subjects...
Arpad
-----------------------------------------=3D20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
=3D On Behalf Of Somesh Dhavala
Sent: Thursday, January 05, 2006 6:54 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] METASTABILITY
Hi All,
I am very new to the SI.
I am unable to understand the concept of *METASTABILITY*, I am very =3D =
thank ful to you if you explain me in detail.
Please suggest me some documents.
Thanks & Regards
Somesh Dhavala
CG-CoreEl
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