【黑金教程笔记之003】【建模篇】【Lab 02 闪耀灯和流水灯】—笔记

/****************************************
module name:flash_module
function:flash a led at 10Hz

by yf.x
2014-11-4

***************/

module flash_module(
CLK,
RST_n,
LED
);

input CLK,RST_n;
output LED;

/*********************************/
//DE2-115 use 50MHz osc, 50M*0.05-1=2_499_999
parameter 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 LED
14 );
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_999
22 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 else
34   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 begin
57   if(rLED==3‘b000)
58     rLED<=3‘b001;
59   else
60     rLED<={rLED[1:0],1‘b0};
61 end
62 
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_LED
19 );
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