module Running_Lights(CIk,rst,led,cTk;input rst;output[3:01led;reg[3:0] led;reg[31:0]timer;always@(posedge clk or negedge rst) abeginif(rst==1'b0)timerf32doi3zd199 999_999)else if (timertimer <= 32'd0;elsetimer <= timer + 32'd1;endalways@(posedge clk or negedge rst) beginif(rst== 1'b0)ed心= booo0;elseif(timer —3210491999_999)ledctingPoo1ielse led if一 321099 999.1999)b0010;elseif (timer 92 d149_993_999)else led<=4 b0100;if(timer 32'd199_999_999)end led<=4 b1000;endmodule实在找不出问题出哪儿啦？？？