/****************************************module name:flash_modulefunction:flash a led at 10Hzby yf.x2014-11-4***************/module flash_module(CLK,RST_n,LED);input CLK,RST_n;output LED;/*********************************///DE2-115 use 50MHz osc, 50M*0.05-1=2_499_999parameter T50ms=22‘d2_499_999;/*********************************/reg [21:0]count1;always @(posedge CLK or negedge RST_n)if(!RST_n)  count1<=22‘d0;else if(count1==T50ms)  count1<=22‘d0;else  count1<=count1+1‘b1;/************************************/reg rLED;always @(posedge CLK or negedge RST_n)if(!RST_n)  rLED<=1‘b0;else if(count1==T50ms)  rLED<=~rLED;/*********************************/assign LED=rLED;endmodule  

 1 /*********************************** 2 module name:run_module  3 function:3 led light on one bye one at  4          each 100ms. 5  6 by yf.x 7 2014-11-04             8 ***********************************/ 9 10 module run_module(11 CLK,12 RST_n,13 LED14 );15 16 input CLK;17 input RST_n;18 output [2:0]LED;19 20 /****************************************/21 //DE2-115 use 50MHz osc,50M*0.001-1=49_99922 parameter T1ms=16‘d49_999;23 24 /****************************************/25 26 reg [15:0]count1;27 28 always @(posedge CLK or negedge RST_n)29 if(!RST_n)30   count1<=16‘d0;31 else if(count1==T1ms)32   count1<=16‘d0;33 else34   count1<=count1+1‘b1;35   36 /**************************************/37 38 reg [9:0] count_ms;39 40 always @(posedge CLK or negedge RST_n)41 if(!RST_n)42   count_ms<=10‘d0;43 else if(count_ms==10‘d100) //100ms 44   count_ms<=10‘d0;45 else if(count1==T1ms)46   count_ms<=count_ms+1‘b1;47 48 /*************************************/49 50 reg [2:0]rLED;51 52 always @(posedge CLK or negedge RST_n)53 if(!RST_n)54   rLED<=3‘b001;55 else if(count_ms==10‘d100)56 begin57   if(rLED==3‘b000)58     rLED<=3‘b001;59   else60     rLED<={rLED[1:0],1‘b0};61 end62 63 /*************************************/64 65 assign LED=rLED;66 67 endmodule 68      69 70   

 1 /**************************************** 2 module name:mix_module 3 function:top module,flash 1 led and run 3 led 4  5 pin assignments(for DE2_115) 6 ---------------------------------------- 7 CLK------------------------CLOCK_50 8 RST_n----------------------KEY[0] 9 Flash_LED------------------LEDG[3]10 Run_LED[2:0]---------------LEDG[2:0]11 12 *****************************************/13 14 module mix_module(15 CLK,16 RST_n,17 Flash_LED,18 Run_LED19 );20 21 input CLK;22 input RST_n;23 output Flash_LED;24 output [2:0]Run_LED;25 26 /**************************************/27 28 wire flash_led;29 30 flash_module u0(31 .CLK(CLK),32 .RST_n(RST_n),33 .LED(flash_led)34 );35 36 /************************************/37 38 wire [2:0] run_led;39 40 run_module u1(41 .CLK(CLK),42 .RST_n(RST_n),43 .LED(run_led)44 );45 46 /***********************************/47 48 assign Flash_LED=flash_led;49 assign Run_LED=run_led;50 51 /************************************/52 53 endmodule