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// Shift Register Test Bench

//

module shiftr_tb;

reg en_in, en_out, clk, rst;

reg [7:0] data_in;

wire [7:0] data_out;

shiftr dut (

        .en_in(en_in),

        .en_out(en_out),

        .clk(clk),

        .rst(rst),

        .data_in(data_in),

        .data_out(data_out)

);

initial

begin

        clk = 1;

        en_in = 0;

        en_out = 0;

        rst = 1;

        data_in = 0;

        @(posedge clk)

                rst = 0;

        @(posedge clk)

                en_in = 1;

                data_in = 1;

        @(posedge clk)

                data_in = 2;

        @(posedge clk)

                data_in = 3;

        @(posedge clk)

                en_out = 1;

                data_in = 4;

        @(posedge clk)

                data_in = 5;

        @(posedge clk)

                en_in = 0;

        @(posedge clk);

        @(posedge clk);

        @(posedge clk)

                en_out = 0;

        @(posedge clk);

        @(posedge clk);

        @(posedge clk);

        @(posedge clk);

        @(posedge clk);

end

always

        #100 clk = ~clk;

always @(posedge clk or rst)

        #1 $display("At t=%t : en_in=%h, en_out=%h, data_in=%h, data_out=%h",

                                                $time, en_in, en_out, data_in, data_out);

endmodule