[SI-LIST] Accounting common mode noise for VIX measurement (DDR)

From: "Repala, Muralimohan" <muralimohan.repala@xxxxxxxxx>
To: "si-list@xxxxxxxxxxxxx" <si-list@xxxxxxxxxxxxx>
Date: Tue, 19 Apr 2011 18:33:06 +0530

Hello everyone,
I have a question on how to consider the common mode noise when measuring the 
DQS VIX (DDR IF).

Below is my interconnect pattern:

DQ1-DQ2-DQSP DQSN-DQ3-DQ4

I want to account CM xtalk coming onto DQS pair from the aggressors. I using 
same buffer for both DQ and DQS.

Is it enough to consider CM Xtalk coming from DQ1 and DQ2. (or) should I 
consider CM Xtalk from all aggressors. Will there not be any cancellation of 
Xtalk as I am using same buffers for all nodes.

Thanks,
Murali

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[SI-LIST] Accounting common mode noise for VIX measurement (DDR)

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