常用分频器设计

（含0.5hz、1hz、2hz、100hz、1khz、100khz、1MHZ）

一、原理图

二、程序（输入频率为50MHZ）

module divclk(clk,div05hz,div1hz,div2hz,div100hz,div1khz,div10khz,div1mhz);

input clk;

output div05hz,div1hz,div2hz,div100hz,div1khz,div10khz,div1mhz;

reg div05hz,div1hz,div2hz,div100hz,div1khz,div10khz,div1mhz;

reg[4:0] count1;

reg[14:0] count2;

reg[8:0] count3;

reg[7:0] count4;

reg[2:0] count5;

reg[12:0] count6;

reg[10:0] count7;

always @(posedge clk)

begin

if(count1=='d25)

begin div1mhz<=~div1mhz;count1<=0;end

else

begin count1<=count1+1'b1;end

if(count2=='d25000)

begin div1khz<=~div1khz;count2<=0;end else

begin count2<=count2+1'b1;end

if(count6=='d2500)

begin div10khz<=~div10khz;count6<=0;end else

begin count6<=count6+1'b1;end

end

always @(posedge div1khz)

begin

if(count3=='d500)

begin div1hz<=~div1hz;count3<=0;end else

begin count3<=count3+1'b1;end

if(count4=='d250)

begin div2hz<=~div2hz;count4<=0;end else

begin count4<=count4+1'b1;end

if(count5=='d5)

begin div100hz<=~div100hz;count5<=0;end else

begin count5<=count5+1'b1;end

if(count5=='d1000)

begin div05hz<=~div05hz;count7<=0;end else

begin count7<=count7+1'b1;end

end

endmodule