[SI-LIST] Re: ODT Impedance on DDR2
- From: Mashook Ahamed Usman <MashookAhamed.Usman@xxxxxxxxxxx>
- To: sudarshan kr <sudarshankr@xxxxxxxxx>, "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
- Date: Thu, 10 Dec 2009 17:42:01 +0530
Hi Sudarshan,
Our usual practice is to simulate with these three configuration(usually
various models comes with the IBIS model of the same chipset) and see which has
the least shoot and proper rise time in run interactive window of the tool. If
possible use the DDR2 wizard(Hyperlynx8.0)and see the overall result in the
excel sheet which tells you how many cases passed and failed.
All the best,
M Usman
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of sudarshan kr
Sent: Thursday, December 10, 2009 5:00 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] ODT Impedance on DDR2
Hi All,
I am validating the DDR memory controller from 3rd party IP. With related to
the ODT settings of the DDR device, how to qualify and quantify which of the 3
options(75,150,50Ohm) gives the better results.
I saw few waveforms on the website which shows an eye pattern of the w/f.
But i didnot understand how this is created using a differential signal probed
using an differential probe.
Thanks in advance
Regards,
Sudarshan
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