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WLin30's avatar
WLin30
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4 years ago

Does the ddr3 descrete components' command & address signals need termination resistors for c10?

I have design a board c5+descrete ddr3 component which command & address signals do not have termination resistors which run ok. I am not sure wheter C10 also ok for such design.

6 Replies

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor

    Hi,


    The DDR3 discrete components' command & address signals are required the termination resistor.

    In Cyclone 10, you can use the internal termination scheme such as on-chip termination (OCT) and on-die termination (ODT) instead of external termination resistor.


    You can always refer to Cyclone 10 EMIF User Guide in the link below.

    https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/ug/ug-20116.pdf


    May I know whether you setup the OCT and ODT on your design Cyclone V with DDR3?


    Thanks.



    • WLin30's avatar
      WLin30
      Icon for New Contributor rankNew Contributor

      Do you mean that by setting Cyclone10's OCT/ODT that need not external termination resistor?

      • WLin30's avatar
        WLin30
        Icon for New Contributor rankNew Contributor

        If yes, how to set the EMIF's parameters?

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor

    Hi Sir,


    You can set your EMIF's parameter according to your memory spec and datasheet.


    For the OCT/ODT, you are encourage to perform on board simulation to get the optimal value.


    As I stated in my previous comment, you can always refer to the Cyclone 10 EMIF User Guide to setup your EMIF's parameter.


    Thanks.


  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor

    Hi WLin30,


    I hope you are doing well.


    I have to close the case since you don't have further question for this case.


    You can always file a new case if you get the problem or issue in using the Intel product.


    Thank you for using Intel Community.


    Regards,

    Adzim