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前言

提示：这里可以添加本文要记录的大概内容：
这里主要展现实现数字钟的重要步骤的代码，有需求者自取。我们利用的是quartus II软件来实现。

一、模6计数器的代码：

module counter6(
input clk,rstn,ce,
output reg[3:0]counter6,
output tc6);

assign tc6=(counter6==4'd5);
always @(posedge clk)
begin
    if(!rstn)
	     counter6 = 4'd0;
	 else if(~ce)
	     counter6<=counter6;
	 else if(counter6>=4'd5)
	     counter6<=4'd0;
	
	 else
	     counter6<=counter6+1'b1; 
end 
endmodule 

仿真：

二、模10计数器的代码

module counter10(
input clk,rstn,ce,
output reg[3:0]counter10,
output tc10);

assign tc10=(counter10==4'd9);
always @(posedge clk)
begin
    if(!rstn)
	     counter10 = 4'd0;
	 else if(~ce)
	     counter10<=counter10;
	 else if(counter10>=4'd9)
	     counter10<=4'd0;
	
	 else
	     counter10<=counter10+1'b1; 
end 
endmodule 

仿真：

三、模60计数器的代码

这里需要调用上面模6和模10模块，故而应该将他们放到同一个工程下。

module counter60(
input clk,rstn,ce,
output [7:0]counter60,
output tc60);
wire tc10,tc6;
wire ce1;
counter6 u1(
.clk(clk),
.rstn(rstn),
.ce(ce1),
.counter6(counter60[7:4]),
.tc6(tc6));

counter10 u2(
.clk(clk),
.rstn(rstn),
.ce(ce),
.counter10(counter60[3:0]),
.tc10(tc10));

assign ce1=(counter60[3:0]==4'h9)&ce;//29的时候能保持
assign tc60=(tc10&tc6);
endmodule 

仿真：

四、模24计数器的代码

这里也需要调用模10和模6的模块，应该将他们放到同一个工程下面

module counter60(
input clk,rstn,ce,
output [7:0]counter60,
output tc60);
wire tc10,tc6;
wire ce1;
counter6 u1(
.clk(clk),
.rstn(rstn),
.ce(ce1),
.counter6(counter60[7:4]),
.tc6(tc6));

counter10 u2(
.clk(clk),
.rstn(rstn),
.ce(ce),
.counter10(counter60[3:0]),
.tc10(tc10));

assign ce1=(counter60[3:0]==4'h9)&ce;//29的时候能保持
assign tc60=(tc10&tc6);
endmodule 

仿真：

五、显示控制电路模块代码

module segdis(
input clk,rstn,
input [3:0]dig6,dig5,dig4,dig3,dig2,dig1,
output reg[6:0]dig_out,
output reg[5:0]dig_cs);
always@(posedge clk)
begin 
if(!rstn)
        dig_cs  <= 6'b111110;
else 	    

        dig_cs <= {dig_cs[4:0],dig_cs[5]};
end 
reg [3:0]dig_num;
always@(*)begin
case(dig_cs)
6'b111110:dig_num<=dig1;
6'b111101:dig_num<=dig2;
6'b111011:dig_num<=dig3;
6'b110111:dig_num<=dig4;
6'b101111:dig_num<=dig5;
6'b011111:dig_num<=dig6;
default:  dig_num<=dig6;
endcase
end 
always@(*)begin
case(dig_num)
4'd0:dig_out=7'b111_1110;
4'd1:dig_out=7'b011_0000;
4'd2:dig_out=7'b110_1101;
4'd3:dig_out=7'b111_1001;
4'd4:dig_out=7'b011_0011;
4'd5:dig_out=7'b101_1011;
4'd6:dig_out=7'b001_1111;
4'd7:dig_out=7'b111_0000;
4'd8:dig_out=7'b111_1111;
4'd9:dig_out=7'b111_1011;
default:dig_out=7'b111_1011;
endcase
end
//1 clk dig_cs
// mux dig6-dig1==>dig
//显示译码
endmodule 

六、1khz和250khz时钟输出实现的代码

• 1khz：

module clock_div_1hz(
input clk,rstn,
output reg clk1hz);
reg [25:0] cnt1hz;

always@(posedge clk)begin 
if(~rstn)begin 
    cnt1hz <=26'd0;
	 clk1hz <=1'b1;
	 end
else if(cnt1hz>=26'd24999999)begin 

    cnt1hz <=26'd0;
	 clk1hz <= ~clk1hz;
	 end
else begin
    cnt1hz <=cnt1hz +1'b1;
	 clk1hz <=clk1hz;
	 end
end 
endmodule 

• 250khz:

module clock_div_1hz(
input clk,rstn,
output reg clk1hz);
reg [25:0] cnt1hz;

always@(posedge clk)begin 
if(~rstn)begin 
    cnt1hz <=26'd0;
	 clk1hz <=1'b1;
	 end
else if(cnt1hz>=26'd24999999)begin 

    cnt1hz <=26'd0;
	 clk1hz <= ~clk1hz;
	 end
else begin
    cnt1hz <=cnt1hz +1'b1;
	 clk1hz <=clk1hz;
	 end
end 
endmodule 

七、数字钟的实现代码

这里需要调用前面的模24，模60，显示模块，1KHZ,250KHZ模块一块实现

module top(
input clk,rstn,en,
output [6:0]dig_out,
output [5:0]dig_cs);

wire clk1;
wire clk2;
wire [7:0]counter24;
wire [7:0]counter60m;
wire [7:0]counter60s;
wire en1;
wire en2;
wire tc60s;
wire tc60m;
clock_div_250k u1(
.clk(clk),.rstn(rstn),.clk250khz(clk1));


counter24 u3(
.clk(clk2),
.rstn(rstn),
.ce(en2),
.counter24(counter24));

clock_div_1hz u4(
.clk(clk),
.rstn(rstn),
.clk1hz(clk2));
counter60 u5(

.clk(clk2),
.rstn(rstn),
.ce(en1),
.counter60(counter60m),
.tc60(tc60m));
counter60 u6(

.clk(clk2),
.rstn(rstn),
.ce(en),
.counter60(counter60s),
.tc60(tc60s));
segdis u2(
.clk(clk1),.rstn(rstn),.dig6(counter24[7:4]),.dig5(counter24[3:0]),.dig4(counter60m[7:4]),.dig3(counter60m[3:0]),
.dig2(counter60s[7:4]),.dig1(counter60s[3:0]),.dig_out(dig_out),.dig_cs(dig_cs));
assign en1=tc60s&en;
assign en2=tc60s&tc60m&en;

endmodule 

八、引脚设置：

总结

本文主要展现了实现数字钟模块的几步重要代码，有需要者自取。