[ibis-macro] Re: Eye mask question
- From: "Ward, Richard" <richard.ward@xxxxxx>
- To: "Arpad_Muranyi@xxxxxxxxxx" <Arpad_Muranyi@xxxxxxxxxx>, IBIS-ATM <ibis-macro@xxxxxxxxxxxxx>
- Date: Tue, 8 Dec 2009 12:55:40 -0600
Hi Arpad,
If I understand the question, it's "What's the reference point for placing the
eye mask template?" ? [that mask can be Tx or Rx sides, depending on the
standard chosen]
My view is:
There is no absolute reference given the nature of the links.
The common practice is to centre the mask inside the output eye, but this is
completely tester determined [we're talking compliance testing here]. Given
that the horizontal and vertical edge points are defined, the absolute timing
reference doesn't matter - that's the whole point of the link....timing/data
extraction.
Regards,
Richard
-----Original Message-----
From: ibis-macro-bounce@xxxxxxxxxxxxx [mailto:ibis-macro-bounce@xxxxxxxxxxxxx]
On Behalf Of Muranyi, Arpad
Sent: Tuesday, December 08, 2009 10:43 AM
To: IBIS-ATM
Subject: [ibis-macro] Re: Eye mask question
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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