[SI-LIST] Re: SATA eye diagram - how much is too much
- From: "Chris McGrath" <chris.mcgrath@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Tue, 5 Oct 2004 08:24:02 -0700
If you are violating the eye mask under nominal environmental
conditions, you may want to make sure that the violations don't get
worse when the voltages are varied across their full tolerance as well
as looking at it under the extreme temperature ratings. =20
-Chris
> -----Original Message-----
> From: Istvan Novak [mailto:Istvan.Novak@xxxxxxx]=20
> Sent: Tuesday, October 05, 2004 11:15 AM
> To: Charles.Grasso@xxxxxxxxxxxx
> Cc: 'si-list@xxxxxxxxxxxxx'
> Subject: [SI-LIST] Re: SATA eye diagram - how much is too much
>=20
>=20
> Charles,
>=20
> I think this may be a grey area, where depending on the what=20
> is exactly=20
> you measure and what are the quality/reliability expectations of your=20
> system, you may need to take a further look.
>=20
> One could argue that one violation (which may or may not turn into an=20
> error in your system) per minute is not a big deal, and it is=20
> probably=20
> true that if errors do not line up into longer bursts, it=20
> would be hard=20
> to notice in a user-run system without careful measurements. =20
> However,=20
> the performance numbers extrapolated from a relatively short=20
> period of=20
> time assume that the statistics of noise/interference causing the=20
> violations/errors do not change with time. In general, this is not=20
> true. A simple example is violation/error introduced by=20
> data-dependent=20
> crosstalk and ISI, induced for instance from a DIFFERENT, UNRELATED=20
> subsystem. Unless you make sure that the neighboring=20
> subsystems, which=20
> may induce noticeable noise onto your link under test are really=20
> excercised over all of their possible combinations of=20
> activities, it is=20
> very questionable to extrapolate from short samples.
>=20
> Regards,
>=20
> Istvan
>=20
>=20
> Grasso, Charles wrote:
> > Greetings!
> > =20
> > I have a question regarding the interpretation of the eye=20
> diagram data=20
> > vis a vis SATA.
> > =20
> > How many violations of the eye does it take before a design=20
> is brought=20
> > to a
> > screeching halt? A follow up question:
> > =20
> > Can eye violations be graded in terms of severity based on the=20
> > location of the violation (that is : at the outer bounds, or the=20
> > internal eye trapezoid )?
> > =20
> > The basis of this question (naturally) is that I have SATA=20
> data that=20
> > have exactly one 1 violation at the outer bound of the eye=20
> at 1 minute=20
> > of data capture. Typical go/no go specification will=20
> determine that to=20
> > be a fail. I am not so sure.
> > Any insight would be greatly appreciated.
> > =20
> > Thanks
> > =20
> > Best Regards
> > Charles Grasso
> > Senior Compliance Engineer
> > Echostar Communications Corp.
> > Tel: 303-706-5467
> > Fax: 303-799-6222
> > Cell: 303-204-2974
> > Email: charles.grasso@xxxxxxxxxxxx;=20
> > <mailto:charles.grasso@xxxxxxxxxxxx; > Email Alternate:=20
> > chasgrasso@xxxxxxxx <mailto:chasgrasso@xxxxxxxx>
> > =20
> > =20
> >=20
> >=20
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> --=20
> Istvan Novak Sun Microsystems, Inc.
> Istvan.Novak@xxxxxxx Workgroup Servers, BDT Group,
> One Network Drive, Burlington, MA 01803
> Phone: (781) 442 0340
>=20
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