Using Task

Question

Problem: Using Task. Solve this hands-on electronics task on EWskills.

Accepted Answer

module sat_add8_wrap (
    input  [7:0] a,
    input  [7:0] b,
    output reg [7:0] sum,
    output reg       carry
);
    task sat_add8;
        input  [7:0] ta, tb;
        output [7:0] tsum;
        output       tcarry;
        reg   [8:0]  raw;
        begin
            raw    = ta + tb;
            tcarry = raw[8];
            tsum   = tcarry ? 8'hFF : raw[7:0];
        end
    endtask

    reg [7:0] s;
    reg       c;

    always @* begin
        sat_add8(a, b, s, c);
        sum   = s;
        carry = c;
    end
endmodule

💡Remember

Tasks can return multiple results via output args — perfect for (sum, carry).
Call tasks from always @* for combinational behavior; drive all outputs to avoid latches.
This pattern cleanly separates algorithm (task) from wiring (module).

60. Using Task