实现8个绿灯LEDG0~LEDG7、16个红灯LEDR0~LEDR15流动顺序点亮。

以下是使用Verilog HDL实现该功能的代码：

module LED_Controller(
    input clk,
    output reg [7:0] LED_Green,
    output reg [15:0] LED_Red
);

reg [3:0] counter;

always @(posedge clk) begin
    if (counter == 4'd15) begin
        counter <= 4'd0;
    end
    else begin
        counter <= counter + 1;
    end
end

always @(posedge clk) begin
    case (counter)
        4'd0: begin
            LED_Green <= 8'b00000001;
            LED_Red <= 16'b0000000000000001;
        end
        4'd1: begin
            LED_Green <= 8'b00000010;
            LED_Red <= 16'b0000000000000010;
        end
        4'd2: begin
            LED_Green <= 8'b00000100;
            LED_Red <= 16'b0000000000000100;
        end
        4'd3: begin
            LED_Green <= 8'b00001000;
            LED_Red <= 16'b0000000000001000;
        end
        4'd4: begin
            LED_Green <= 8'b00010000;
            LED_Red <= 16'b0000000000010000;
        end
        4'd5: begin
            LED_Green <= 8'b00100000;
            LED_Red <= 16'b0000000000100000;
        end
        4'd6: begin
            LED_Green <= 8'b01000000;
            LED_Red <= 16'b0000000001000000;
        end
        4'd7: begin
            LED_Green <= 8'b10000000;
            LED_Red <= 16'b0000000010000000;
        end
        4'd8: begin
            LED_Green <= 8'b01000000;
            LED_Red <= 16'b0000000100000000;
        end
        4'd9: begin
            LED_Green <= 8'b00100000;
            LED_Red <= 16'b0000001000000000;
        end
        4'd10: begin
            LED_Green <= 8'b00010000;
            LED_Red <= 16'b0000010000000000;
        end
        4'd11: begin
            LED_Green <= 8'b00001000;
            LED_Red <= 16'b0000100000000000;
        end
        4'd12: begin
            LED_Green <= 8'b00000100;
            LED_Red <= 16'b0001000000000000;
        end
        4'd13: begin
            LED_Green <= 8'b00000010;
            LED_Red <= 16'b0010000000000000;
        end
        4'd14: begin
            LED_Green <= 8'b00000001;
            LED_Red <= 16'b0100000000000000;
        end
        4'd15: begin
            LED_Green <= 8'b00000000;
            LED_Red <= 16'b1000000000000000;
        end
    endcase
end

endmodule

在该代码中，我们使用了两个always块。第一个always块用于计数器的计数，它会在每个时钟上升沿时加1。当计数器达到最大值时，它会被重置为0。

第二个always块使用case语句根据计数器的值来选择点亮哪些LED。在每个时钟上升沿时，它将根据计数器的值设置LED_Green和LED_Red的值。

请注意，我们在代码中使用了二进制字面量，例如8'b00000001表示一个8位二进制数，其中只有最低位为1，其他位为0。类似地，16'b0000000000000001表示一个16位二进制数，其中只有最低位为1，其他位为0。

对于该代码的测试，我们可以使用FPGA板或仿真器。在仿真器中，我们可以将时钟信号作为输入，同时观察LED_Green和LED_Red的输出是否按照预期顺序点亮。