CODEWITHSUNDEEP
verilogfpgasystem-verilogquartusintel-fpga
Zacharie McCormick
Zacharie McCormick

Reputation: 63

Quartus Prime throwing an error at a $error command

I am having a problem with the following code which should simply throw an error at compilation if my number of inputs is not divisible by my number of outputs.

module multiplexer #(parameter N_INPUTS, parameter N_OUTPUTS) (in, out, select);

    generate
        if (N_INPUTS % N_OUTPUTS != 0) begin
            $error("%m ** Illegal Parameter ** NUMBER OF INPUTS(%d) does not divide into NUMBER OF OUTPUTS(%d)", N_INPUTS, N_OUTPUTS);
        end
    endgenerate

    input wire [N_INPUTS-1:0] in;
    input wire [$clog2(N_INPUTS/N_OUTPUTS) - 1:0] select;
    output wire [N_OUTPUTS-1:0] out;

    always @ (select, in) begin
        out = in[(select + 1) * N_OUTPUTS - 1:(select + 1) * N_OUTPUTS - N_OUTPUTS];
    end

endmodule

But Quartus keep throwing me this error when I proceed to an Analysis:

Error (10170): Verilog HDL syntax error at multiplexer.v(5) near text: "$error";  expecting "end". Check for and fix any syntax errors that appear immediately before or at the specified keyword. The Intel FPGA Knowledge Database contains many articles with specific details on how to resolve this error. Visit the Knowledge Database at https://www.altera.com/support/support-resources/knowledge-base/search.html and search for this specific error message number.

I am beginning to wonder wether or not the compiler of Quartus supports the $error command (it's my first time using it).

I would greatly appreciate any help on the subject since I am still a beginner in the domain :)

Upvotes: 0

Views: 1670

Answers (3)

Charles Clayton
Charles Clayton

Reputation: 17946

Close your Quartus project and in the .qsf file, change the line pointing to your multiplexer module verilog file from:

set_global_assignment -name VERILOG_FILE multiplexer.v

To:

set_global_assignment -name SYSTEMVERILOG_FILE multiplexer.v

Edit:

Also set: 

set_global_assignment -name VERILOG_INPUT_VERSION SYSTEMVERILOG_2009

Edit 2:

It's a SystemVerilog 2009 feature and Quartus Prime Standard and Quartus Prime Lite don't support VHDL 2008 or SystemVerilog 2009.

Quartus Prime Pro 19.4:

enter image description here

Quartus Prime Standard 19.1:

enter image description here

Upvotes: 3

Zacharie McCormick
Zacharie McCormick

Reputation: 63

I found the problem...money... If you look at the following image you'll notice that if you are poor you can't use the latest version of SystemVerilog in the Lite and Standard version of Quartus Prime. enter image description here

Well that explains it all. If anyone as another solution to throw error at compile time that looks better than this please tell me:

generate
if (CONDITION > MAX_ALLOWED /* your condition check */ ) begin
    illegal_parameter_condition_triggered_will_instantiate_an non_existing_module();
end
endgenerate

Note: this was taken from https://electronics.stackexchange.com/a/71226

Upvotes: 1

Matthew
Matthew

Reputation: 13947

I see other errors:

  • you are driving wire out from a procedural block (your always block). You cannot do that, you can only drive a variable. ie out must be a variable.

  • your code inside the square brackets is illegal. You will need to use one of the +: or -: operators. See this answer here.

Upvotes: 0

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