Lab08 - Ej01 - Código & Testbench

module full_adder (input A, B, Cin, output S, Cout);

    assign S = A ^ B ^ Cin;
    assign Cout = A & B | A & Cin | B & Cin;

    /*
    Mismo circuito, pero en un bloque 'always'. Lo dejo aquí como referencia únicamente.

    reg rS, rCout;

    always @ (A or B) begin
        rS = A ^ B ^ Cin;
        rCout = A & B | A & Cin | B & Cin;
    end

    assign S = rS;
    assign Cout = rCout;
    */

endmodule

module testbench();

    reg A, B, Cin;
    wire S, Cout;

    full_adder U1(A, B, Cin, S, Cout);

    initial begin
        $display("Cin A B | S Cout");
        $display("----------------");
        $monitor("  %b %b %b | %b  %b", Cin, A, B, S, Cout);
        Cin = 0; A = 0; B = 0;
        #1
        Cin = 0; A = 0; B = 1;
        #1
        Cin = 0; A = 1; B = 0;
        #1
        Cin = 0; A = 1; B = 1;
        #1
        Cin = 1; A = 0; B = 0;
        #1
        Cin = 1; A = 0; B = 1;
        #1
        Cin = 1; A = 1; B = 0;
        #1
        Cin = 1; A = 1; B = 1;
        #1
        $finish;
    end

endmodule