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PElm's avatar
PElm
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5 years ago

SystemVerilog static variables

I have a problem with local variables in SystemVerilog/Quartus.

static seems not to be working as expected. The following code generates no output(led constant).

always @(posedge clk) begin : P_1us
    static logic [5:0] nClk = 6'd0;
    led <= 1'b0;
    if( nClk == 50 ) begin
         led <= 1'b1;
         nClk = 0;
    end
    nClk++;
end
However removing "static" it works.
With competing tools(Vivado and more) this work as expected.
It seems static is treated as automatic.

8 Replies

  • sstrell's avatar
    sstrell
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    5 years ago

    What version/edition of Quartus are you using?

    • PElm's avatar
      PElm
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      5 years ago

      @sstrell

      I'm using 20.1.1 Build 720

      Patches Installed: 1.02i

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

    Lite has limited SystemVerilog support. Maybe that's what you're running into. Are there any warnings when you compile?

  • PElm's avatar
    PElm
    Icon for New Contributor rankNew Contributor
    5 years ago

    Does any Altera/Intel staff read this?

    Or how do I report errors in Quartus?

  • RichardT_altera's avatar
    RichardT_altera
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    Hi @PElm

    You may find the warning messages/ error in the Message GUI at the bottom of the Quartus.

    As mentioned here: https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/po/ss-quartus-comparison.pdf

    Quartus lite/standard has limited supported in System Verilog. I would recommend to run in Quartus Pro or to change to Verilog language.

    Best Regards,
    Richard Tan

    p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos.

  • RichardT_altera's avatar
    RichardT_altera
    Icon for Super Contributor rankSuper Contributor
    5 years ago

    I have yet to receive any response from you to the previous question/reply/answer that I have provided but I believed that I have answered your question.
    With that, I will 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.

    Best Regards,
    Richard Tan

    p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos.