[SI-LIST] Re: AW: IBIS-AMI Simulation produces split eye diagram
- From: Hermann Ruckerbauer <hermann.ruckerbauer@xxxxxxxxxxxxx>
- To: Todd Westerhoff <twesterh@xxxxxxxxxx>
- Date: Wed, 05 Jan 2011 15:36:47 +0100
Hello,
according to the description I would expect an issue in the eye
calculation / the postprocessing.
I guess this is really a hard edge where you even can take any bitmap
manipulating software, cut out the 1/3 and place it on the other side of
the 2/3 to get a nice eye again.
In this case this is definitely no issue of the channel, just a problem
of the tools (maybe a combination of model, simulator and
postprocessing) that the tool does not recognize the correct location of
the eye in the Unit interval.
Maybe it is possible to change the behavior by adding some initial delays.
But I guess it is really difficult to find the real reason without
support of the tool vendor. Usually they should be interested in getting
such cases to make their tools robust against such problems ...
Best regards
Hermann
EKH - EyeKnowHow
Hermann Ruckerbauer
www.EyeKnowHow.de
Hermann.Ruckerbauer@xxxxxxxxxxxxx
Veilchenstrasse 1
94554 Moos
Tel.: +49 (0)9938 / 902 083
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schrieb Todd Westerhoff:
> I recommend looking at the impulse response of the channel (the first step of
> any IBIS-AMI simulation) to see how long reflections live in the channel.
> That should tell you whether the closure you're seeing is due to reflections
> or not.
> 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
>
>
> On Jan 5, 2011, at 3:38 AM, "Havermann, Gert" <Gert.Havermann@xxxxxxxxxxx>
> wrote:
>
>> Hi Ravinder,
>>
>> the split eye could be caused by reflections. The reflections with Short
>> traces tends to look like Jitter, but with longer the traces, the eye will
>> start to split up.
>>
>> BR
>> Gert
>>
>>
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>> -----Ursprüngliche Nachricht-----
>>
>> Von: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] Im
>> Auftrag von Ravinder.Ajmani@xxxxxxxxxxxxxx
>> Gesendet: Mittwoch, 5. Januar 2011 05:33
>> An: si-list@xxxxxxxxxxxxx
>> Betreff: [SI-LIST] IBIS-AMI Simulation produces split eye diagram
>>
>> Hi All,
>> I am using Cadence PCB-SI simulator for running IBIS-AMI Channel simulation
>> on a Serial interface. The eye diagram generated by the tool is split, with
>> initial 1/3 part of the eye diagram appearing after the remaining 2/3 part.
>> This does not happen if the channel length is small
>> (1 - 2 inches).
>>
>> I would like to know if anyone else has observed similar phenomenon. I have
>> taken up this issue with Cadence as well as the IBIS-AMI model vendor.
>> Cadence response is that this is due to the model issue, whereas the model
>> vendor says that the model works fine with other simulators.
>>
>> Thanks for the help.
>>
>> Regards,
>> Ravinder Ajmani
>> Server PCB Development
>> Hitachi Global Storage Technologies
>>
>>
>> Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
>>
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