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ArleySalvador's avatar
ArleySalvador
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3 years ago
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DDR4 IBIS Models

I am generating Startisx10 IBIS models for DDR4 pins and there are two pins which same function being assigned to different models:

|
[Pin] signal_name model_name
|
A15 ddr4_dq(15)~pad pod12_rtio_g48c_r48cp1_dqs_lv
A17 ddr4_dq(19)~pad pod12_rtio_g48c_r48cp1_lv

Is that correct?

  • AdzimZM_Altera's avatar
    AdzimZM_Altera
    3 years ago

    Hi Arley,


    The IBIS model is correct. Only the name is not generate properly due to some bug from the Quartus.

    You can use the model that has been generate from the Quartus.


    Regards,

    Adzim


8 Replies

    • ArleySalvador's avatar
      ArleySalvador
      Icon for New Contributor rankNew Contributor
      3 years ago

      Hi Adzim,

      According to the EMIF ipcore configuration below, I expect to have I/O pin restriction for DQS X8/X9.

      Then according to the 1SG040 pinning table, the pins A15 and A17 are supposed be assigned to DQ models.

      Is there any wrong assumption from my side?

      Regards,

      Arley

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

    Hi Arley,


    I have checked this issue internally and I found one similar issue.

    There is a bug with Quartus IBIS generation. The Quartus does not generate the correct IBIS model name for EMIF I/O pins.

    The IBIS model that has been used is accurate.


    Regards,

    Adzim


  • ArleySalvador's avatar
    ArleySalvador
    Icon for New Contributor rankNew Contributor
    3 years ago

    Hi Adzim,

    Please, could you clarify what that means?

    "The IBIS model that has been used is accurate."

    Should I do anything to use to correct model for A15 (for instance)?

    A15 ddr4_dq(15)~pad pod12_rtio_g48c_r48cp1_dqs_lv

    Regards,

    Arley

    • ArleySalvador's avatar
      ArleySalvador
      Icon for New Contributor rankNew Contributor
      3 years ago

      Hi Adzim,

      Please, could you clarify your last help?

      Should I use the model as provided by Quartus tool even though it is not correctly assigned to DQ model?

      Look foward for you reply.

      Regards,

      Arley

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

    Hi Arley,


    The IBIS model is correct. Only the name is not generate properly due to some bug from the Quartus.

    You can use the model that has been generate from the Quartus.


    Regards,

    Adzim


  • 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.