source: trunk/MultiChannelUSB/test.v@ 62

module test
        (
                input   wire                    clk,
                output  wire                    tst_clk,
                output  wire    [11:0]  tst_data
        );

        wire                    int_clk;
        reg     [11:0]  int_data;
        reg             [2:0]   state;

        test_pll test_pll_unit(
                .inclk0(clk),
                .c0(int_clk));

        always @(posedge int_clk)
        begin
                case (state)
                        0: 
                        begin
                                int_data <= 12'd0;
                                state <= 3'd1;
                        end
                        
                        1:
                        begin
                                int_data <= 12'd1024;
                                state <= 3'd2;
                        end

                        2:
                        begin
                                int_data <= 12'd2048;
                                state <= 3'd3;
                        end

                        3:
                        begin
                                int_data <= 12'd3072;
                                state <= 3'd4;
                        end

                        4:
                        begin
                                int_data <= 12'd4095;
                                state <= 3'd0;
                        end

                        default:
                        begin
                                state <= 3'd0;
                        end
                endcase
        end

        assign  tst_clk = int_clk;
        assign  tst_data = int_data;

endmodule