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albertsun's avatar
albertsun
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4 years ago

Quartus Prime Avalon SDRAM Controller - readdatavalid never asserting

I'm currently using the DE2-115 education board and implementing the SDRAM controller. When instantiating a read (from the Avalon MM documentation, I believe read requests are pipelined), the readdatavalid signal from the controller is never asserted even when read is asserted. I have tried both leaving the address and read asserted, and de-asserting the read signal after one clock cycle. I believe all the controller ports are connected properly, but I can't be 100% sure since I don't have access to a simulator. Thanks to everyone in advance.

5 Replies

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

    Hi Sir,


    Do you see the waitrequest signal has been asserted after the read signal been asserted?


    Do you see any difference when using burst operation?


    I can assist you on Simulator (Modelsim) to simulate the design if you want.

    But I need the design file and maybe some instructions.

    Thanks,

    Adzim


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

    Hello,


    I'm hope you're doing well.


    May I have any update on this case?


    Thanks,

    Adzim


    • albertsun's avatar
      albertsun
      Icon for New Contributor rankNew Contributor
      4 years ago

      Hello,

      Apologies for taking awhile to respond. Since the time of posting, I've transitioned to using M9K blocks instead for memory since the application doesn't have a high memory capacity requirement. I've attached a relevant snippet from my wrapper around the SDRAM controller - if that looks good, then there might've been some stray X's within a few signals.

      Thanks for all the help again.

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

    Hello,


    I'm glad to hear from you. Thanks for your update.

    I think the wrapper looks okay.


    Please let me know if you have further question on this topic.


    Thanks,

    Adzim


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

    We do not receive any response from you to the previous reply that I have provided. This thread will be transitioned 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.