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DRAM SDCKE external pull down resistors

Question asked by Atilla Mete Turedi on Nov 30, 2016
Latest reply on Dec 1, 2016 by Atilla Mete Turedi

Hi,

 

Sabre SD has them but HW guide states they are no longer needed because they have on-chip pull downs. I did not implement these in my design but it gets me wondering why it says "no longer". Was this fixed with a new series of chips, if so, how do I know I get the new ones? Do pull downs need to be activated or are they active by default?

 

I am using iMx6Q with T topology 4xDDR3L chips total of 16Gb and only the DRAM_SDCKE0.

 

Regards,

Mete

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