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wenna's avatar
wenna
Icon for New Contributor rankNew Contributor
2 years ago

The increment operation (++) will cause an error.

Consider the following code. Using the i++ operation on line 17 causes an error.

module test1 (
    input wire clk,          
    input wire reset,        
    output reg [7:0] y       
);

    reg [7:0] data [0:3];    
    integer i;               

    always @(posedge clk or posedge reset) begin
        if (reset) begin
            for (i = 0; i <= 3; i = i+1) begin
                data[i] <= 8'h00; 
            end
            y <= 8'h00;
        end else begin
            for (i = 0; i <= 3; i = i++) begin  
                data[i] <= i * 8'h11;
            end
            y <= data[0] + data[1]; 
        end
    end
endmodule
Hdl

5 Replies

  • _AK6DN_'s avatar
    _AK6DN_
    Icon for Frequent Contributor rankFrequent Contributor
    2 years ago

    That is an error. You are writing Verilog, not C. Prefix and postfix ++ and -- are NOT valid operators in Verilog.

    And in any event the operation i = i++ is nonsensical. Think about it.

    I think you meant to write i = i+1 as you did in line 12.

    i++ or ++i would also be logically correct, giving the same result as i=i+1 but as I said earlier they are NOT valid Verilog language syntax.

    • FvM's avatar
      FvM
      Icon for Super Contributor rankSuper Contributor
      2 years ago

      Unary incre- and decrement operators are supported in system verilog, but make no sense on assignment RHS.

      We don't know if SV syntax has been enabled.

  • KennyT_altera's avatar
    KennyT_altera
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    We have quite a lot of loop example in the Quartus tools itself.


    What you will need to do is open up a blank verilog files, right click and insert template. You will see the loop example that you want to do create.


    Do let us know if you have further question? If no, we shall close this thread.


  • KennyT_altera's avatar
    KennyT_altera
    Icon for Super Contributor rankSuper Contributor
    2 years ago

    Not sure if you have further question on this? If no, we shall close this thread.


  • KennyT_altera's avatar
    KennyT_altera
    Icon for Super Contributor rankSuper Contributor
    2 years ago

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