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sgr's avatar
sgr
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3 years ago
Solved

LMI interface in Intel Arria 10 Avalon Streaming Interface for PCI Express

Hi, I have used Intel Arria 10 Avalon Streaming Interface for PCI Express Hard IP as the root port for my design.

I was able to get the PCIe Link Up signal (LTSSM state L0 state is high),

But while writing the configuration register space with some data i was not able to get the lmi_ack signal back.

Is there any reason why that acknowledgment (lmi_ack) is not getting generated even after the data is written to the configuration space register correctly?

Please get me back as soon as possible

  • Wincent_Altera's avatar
    Wincent_Altera
    3 years ago

    Hi,

    We do not receive any response from you to the previous answer that I provided.

    Hence, This thread will be transitioned to community support.

    If you have a new question, feel free to open a new thread to get support from Intel experts.

    Otherwise, the community users will continue to help you on this thread. Thank you

    If you feel your support experience was less than a 9 or 10,

    please allow me to correct it before closing or let me know the cause so that I may improve your future support experience.

    Regards,

    Wincent_Intel


13 Replies

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

    Hi Sagar,


    Nice to see you back.

    Just to let you know that Intel has received your support request and I am assigned to work on it.

    Allow me some time to look into your issue. I shall come back to you with findings.


    Thank you for your patience.

    Best regards,

    Wincent_Intel


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

    Hi Sagar,


    Is there any error message/printscreen that you can provide?


    Regards,

    Wincent_Intel



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

      Hi Wincent_Intel,

      There is no error message in the print screen.

      To ensure my logic is correct I had simulated my code there it is working fine. Please find the attachment for simulation result.

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

    Hi,


    Could please try to change/adjust the input signal and see is it the same thing happen ?


    Regards,

    Wincent_Intel


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

      Hi Wincent_Intel,

      Can you please make sure that, whether LMI interface signal can be used for root port configuration space register write operation?

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

      "Could please try to change/adjust the input signal and see is it the same thing happen?"

      Yes i have tried with different input but acknowledgement is not coming

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

    Hi,


    Can you please make sure that, whether LMI interface signal can be used for root port configuration space register write operation?

    • LMI Write operations are provided for AER header logging, and debugging purposes only if refer to the user guide


    From what I understand, the lmi_ack (Acknowledge signal) normally will sent back when execution is complete.

    Can you please check back is anything wrong with the execution part?


    Regards,

    Wincent_Intel



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

      Hi Wincent_Intel,

      • LMI Write operations are provided for AER header logging, and debugging purposes only if refer to the user guide

      But we are using LMI write for Root port configuration space register operation, may be for that reason it is not working??

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

    Hi,


    Yes, to your answer.

    Can I know why you need to perform that action ?


    Regards,

    Wincent_Intel


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

      Hi Wincent_Intel,

      Because initially I want to configure my Root port configuration space register with appropriate value and then I want to configure my endpoint register space. So, to configure the Root port configuration space register i need LMI Write interface.

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

    Hi ,


    Sagar, Thanks for sharing, but as mentioned in the User guide the LMI Write function are for debugging purpose.

    The function might be limited if you need to perform the feature as needed.


    Based on my understanding An acknowledge signal is sent back to the Application Layer when the execution is complete.

    Can you please check if the execution is complete or stuck anywhere else?


    Regards,

    Wincent_Intel


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

    Hi,

    I wish to follow up with you about this case.

    Do you have any further questions on this matter ?

    ​​​​​​​Else I would like to have your permission to close this forum ticket

    Regards,

    Wincent_Intel


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

    Hi,

    We do not receive any response from you to the previous answer that I provided.

    Hence, This thread will be transitioned to community support.

    If you have a new question, feel free to open a new thread to get support from Intel experts.

    Otherwise, the community users will continue to help you on this thread. Thank you

    If you feel your support experience was less than a 9 or 10,

    please allow me to correct it before closing or let me know the cause so that I may improve your future support experience.

    Regards,

    Wincent_Intel