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jjxichn's avatar
jjxichn
Icon for New Contributor rankNew Contributor
10 months ago

Plan Stage Taking more time than expectation

Hello All,

I am using Quartus 22.4 to do place and route to generate bitstream. I found one design taking about 75% of total area is using 15 hours on the plan stage while other design using similar area only spends 2-3 hours on the plan stage. So I am wondering are there any ways to reduce the time consumed on plan stage? I learned that the plan stage is doing device periphery placement and routing and the device are identical among these projects.

4 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    10 months ago

    15 hours for just Plan? That seems extreme.

    What target device? What are the specs of the computer you are using for compilation? What is different about the I/O setup between the two designs? More details needed.

  • RichardT_altera's avatar
    RichardT_altera
    Icon for Super Contributor rankSuper Contributor
    10 months ago

    Your understanding is correct, the Plan stages—places all periphery elements (such as I/Os and PLLs) and determines a legal clock plan, without core placement or routing.

    With 15 hours on Plan Stage, something might have gone wrong with your design. Even 2-3 hours is consider long. Try to isolate your design by uncomment the instantiation of the design modules or removing portions of RTL code.

    If the time reduces significantly, this might indicates that the issue lies within the commented-out portion of the design.

    Perhaps you may check the what are the differences between these two designs (15 hrs vs 2/3 hrs) that might indicate so. Different IP usage, design constraints, etc.

    Alternatively, you may opt to upgrade your design to the latest Quartus version and see if the time improves.

    Regards,

    Richard Tan

  • RichardT_altera's avatar
    RichardT_altera
    Icon for Super Contributor rankSuper Contributor
    10 months ago

    We noticed that we haven't received a response from you regarding the latest previous question/reply/answer, and will now transitioning your inquiry to our community support. We apologize for any inconvenience this may cause and we appreciate your understanding.

    If you have any further questions or concerns, please don't hesitate to reach out. Please login to https://supporttickets.intel.com/s/?language=en_US, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.

    The community users will be able to help you on your follow-up questions.

    Thank you for reaching out to us!

    Best Regards,

    Richard Tan