[ibis-macro] Re: Eye mask question

  • From: Mike Steinberger <msteinb@xxxxxxxxxx>
  • To: Arpad_Muranyi@xxxxxxxxxx
  • Date: Tue, 08 Dec 2009 12:55:42 -0600

Arpad-
It seems to me that the timing of an Rx mask is going to depend on who defined the mask and what they had in mind when they did it. Therefore I don't think there's any one answer that fits all cases.
One possibility is that the mask would be placed with respect to the clock ticks or an equivalent estimate of recovered clock timing. That choice may be appropriate for some industry standard or locally defined masks. For others, "best fit" might be the appropriate choice. Another possibility would be something related to an ideal clock recovery, such as mean or median threshold crossing time (two separate and distinct possibilities with important differences between them). 

In short, "Ask your mask maker."

Mike S.

Muranyi, Arpad wrote:

Sorry for my poor problem statement...

I mean the output of Rx (as it comes back from
Rx GetWave), used together with the clock ticks
from Rx GetWave to formulate the eye.

Arpad
================================================

-----Original Message-----
From: Todd Westerhoff [mailto:twesterh@xxxxxxxxxx] Sent: Tuesday, December 08, 2009 12:40 PM 
To: Muranyi, Arpad
Cc: IBIS-ATM
Subject: Re: [ibis-macro] Eye mask question

Arpad,
Not meaning to be enigmatic here, but what signal(s) are you thinking get used to generate the eye diagram, and how? 

Todd.

Todd Westerhoff
VP, Software Products
SiSoft
6 Clock Tower Place, Suite 250
Maynard, MA 01754
(978) 461-0449 x24
twesterh@xxxxxxxxxx
www.sisoft.com



Muranyi, Arpad wrote:

Hello IBIS-AMI experts,

This is a question regarding the analysis/evaluation
of the results we get back from an AMI simulation.

How does the user decide whether the eye is good or bad?

Naturally we have this thing called eye mask (template)
which we would all be able to drop into the eye without
touching any of the waveforms.  But where are we trying
to position it?  Anywhere it fits the best way?  Or is
it supposed to be positioned at a certain location?

Thanks for any feedback in advance,

Arpad
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