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DDR2 clock pair differential resistor

Question asked by lhoussain.aitassou_subcontractor on Sep 25, 2012
Latest reply on Sep 26, 2012 by lhoussain.aitassou_subcontractor

Hello,

I'm Lhoussain and I'm working with DDR2 wizard to simulate DDR signals.

 

About the used  topology: I have clock routed in Y format like in the picture below

micron-routing-recommendations.jpg

One problem that I have  is the clock crossover , and after simulating with different RT values I observed that with RT values in order of 400 - 500 ohm , I have got

better results while simulations fails with the recommended values are in the order of 100ohm .

 

Any suggest ?

 

Thank you

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