[SI-LIST] Re: IBIS-AMI Simulation produces split eye diagram
- From: Ambrish Varma <ambrishv@xxxxxxxxxxx>
- To: "Ravinder.Ajmani@xxxxxxxxxxxxxx" <Ravinder.Ajmani@xxxxxxxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 5 Jan 2011 17:35:48 -0800
Hi Ravinder,
The eye centering/post-processing is performed with the help of clock times
that are returned by the AMI model. I have seen models that return faulty clock
times that result in a shifted eye.
As Todd and Hermann correctly point out - eye-centering and display are tool
specific issue and it is quite possible that other tools/simulators fix the eye
in some way before displaying it to the user.
You have mentioned that a previous version of the AMI model gives you a good
eye. I could run a simple debug with that model that will let me know if this
is a clock time issue or something else.
Please contact me offline if you want to do so.
Thanks,
-Ambrish.
Ambrish Varma | Member of Consulting Staff
P: 978.262.6431 www.cadence.com
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Ravinder.Ajmani@xxxxxxxxxxxxxx
Sent: Wednesday, January 05, 2011 12:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: IBIS-AMI Simulation produces split eye diagram
Thanks to all who responded to my post. Let me provide some additional
information:
1. I am using an ideal 100 ohm differential transmission line as the
Channel in my simulation setup. The problem shows up if I simply increase
the length of the transmission line from 1" to 4".
2. I am able to obtain a good eye with the same Channel, if I use the Rx
AMI model for a previous ASIC.
3. The eye produced by Cadence simulator is a graphic representation
only, and I can not manipulate any eye parameter.
Next I will try playing with the simulation step size.
Regards,
Ravinder Ajmani
Server PCB Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
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