[SI-LIST] Re: METASTABILITY
- From: <art_porter@xxxxxxxxxxx>
- To: <james.f.peterson@xxxxxxxxxxxxx>, <tbiggs@xxxxxxxxxxxxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Wed, 11 Jan 2006 15:21:53 -0700
By the way no latch or FF is "metastable-proof". All you can hope for is =
to make the probability of metastability as small as desired (but not =
zero).=20
Art Porter
Agilent Technologies =20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On Behalf Of Peterson, James F (FL51)
Sent: Monday, January 09, 2006 12:44 PM
To: tbiggs@xxxxxxxxxxxxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: METASTABILITY
A quick read of the app-note shows the "metastable-proof flip-flop" as a
double flip-flop (or latch) circuit., so it's a nifty little
metastable-proof circuit (which is done all the time), not a
metastable-proof flip-flop.=20
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
On
Behalf Of Tom Biggs
Sent: Monday, January 09, 2006 1:52 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: METASTABILITY
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Mike Greim
"However fast we make the device, =3D3D there is always the possibility =
=3D that
the input events will be so close =3D3D together that it cannot detect =
=3D which
one happened first. It is therefore =3D3D logically impossible to build =
a
perfectly metastable-proof flip-flop."
----------------
Actually, that's not true. Philips used to sell PLDs with =
metastable-proof
flip-flop.
I think they sold their PLD line to Xilinx, but I haven't heard of these
parts since.
I found an apnote describing them:
http://noel.feld.cvut.cz/hw/philips/acrobat/8175.pdf
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