Lab10 - Ej04 - Buffer tri-estado y su testbench

module tri_buffer(input E, input [3:0] A, output [3:0] Y);

    assign Y = E ? A : 4'bz;

endmodule

module tb();

    reg E;
    reg [3:0] A;
    wire [3:0] Y;

    tri_buffer DUT (E, A, Y);

    initial begin
        A = 0; E = 0;
        $monitor("E: %b A: %b Y: %b", E, A, Y);
        #1
        A = 7; E = 0;
        #1
        A = 7; E = 1;
        #1
        A = 2; E = 1;
        #1
        A = 2; E = 0;
        #1
        A = 14; E = 0;
    end

endmodule