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Norick's avatar
Norick
Icon for New Contributor rankNew Contributor
7 years ago
Solved

Warning message: "Missing drive strength"

Hello

with Quartus 18.0 and a Max10 device I get following I/O assignment warning message:

When I check the Pin Planner I see following default values:

Question:

  • Why this warning message when the default current drive strength is set to its default value?!

thanks

  • sstrell's avatar
    sstrell
    7 years ago

    Quartus is weird: it says you are "missing drive strength" because you didn't explicitly create the assignment yourself to have it written into the .qsf file. What you see is the default and is not written in the .qsf. You can safely ignore this or manually add a drive strength assignment.

3 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    7 years ago

    Quartus is weird: it says you are "missing drive strength" because you didn't explicitly create the assignment yourself to have it written into the .qsf file. What you see is the default and is not written in the .qsf. You can safely ignore this or manually add a drive strength assignment.

    • MLars19's avatar
      MLars19
      Icon for New Contributor rankNew Contributor
      1 year ago

      Hi

      This issue arises when using the ASMI IP, I get these warnings:

      +------------------------------------------+
      ; I/O Assignment Warnings ;
      +-----------------+------------------------+
      ; Pin Name ; Reason ;
      +-----------------+------------------------+
      ; sd2~ALTERA_DCLK ; Missing drive strength ;
      ; sd2~ALTERA_SCE ; Missing drive strength ;
      ; sd2~ALTERA_SDO ; Missing drive strength ;
      +-----------------+------------------------+

      It is not possible to set drive strength in these pins as far as I know

      Is there any way to constrain these to get rid of the warning.

      There is always the possibility to supress these warnings but I would prefer to take care of them so it doesn't become warnings

      /Magnus