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cepni's avatar
cepni
Icon for New Contributor rankNew Contributor
3 years ago
Solved

arria10 ddr3 vref mistake

hi,

ddr3 interface connected 3A and 3B banks, Vref3a and vreg3b pins connected 0V(ground). Can I use internal Vref voltage reference ?

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    3 years ago

    Hello,


    Thank you for using Intel Community.

    I am Adzim, application engineer will help you on this topic.


    The ddr3 interface required the Vref connection for the data pins only.

    You should refer to Quartus compilation report on which IO bank that required the Vref connection.


    "Can I use internal Vref voltage reference ?"

    • Yes you should be able to use that.


    Regards,

    Adzim


5 Replies

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hello,


    Thank you for using Intel Community.

    I am Adzim, application engineer will help you on this topic.


    The ddr3 interface required the Vref connection for the data pins only.

    You should refer to Quartus compilation report on which IO bank that required the Vref connection.


    "Can I use internal Vref voltage reference ?"

    • Yes you should be able to use that.


    Regards,

    Adzim


  • FvM's avatar
    FvM
    Icon for Super Contributor rankSuper Contributor
    3 years ago

    Not sure about the solution. According to Arria 10 handbook, internal Vref is only supported for POD12 (DDR4) IO-standard.

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    Hello,


    There was a mistake in my previous reply.

    The DDR3 interface has some pins that required the Vref connection.

    The connection must be used from the external Vref.



  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    Icon for Regular Contributor rankRegular Contributor
    3 years ago

    I’m glad that your question has been addressed, I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.