clk_3

// date : 2013,3,18

//designer : pengxiaoen

// function:the T  of  the output_clk  is three times of clk

 

module  clock_3 (                        

          clk,reset,                         

          clk_temp,output_clk                        

                          ) ;

input clk,reset;

output clk_temp,output_clk ;

reg output_clk;

 

reg [31:0]  temp;

//-----------------------------------------------

always @ (posedge clk or negedge reset)

if (!reset) 

   temp <= 32'd0;

else if (temp[25] == 1) 

    temp <= 32'd0;   

  else temp = temp+1;

 

reg clock_temp;

//----------------------------------------------- 随便进行了一个分频,因为我的基准时钟要绑定在一个led上,当然就不可以把50M当成基准了

always @ (posedge clk or negedge reset)

if (!reset)  clock_temp <= 1'b0;

else if (temp[25])  clock_temp <= ~clock_temp;      

 

reg [1:0] a,b; //--------------------------------------------------

always @ (posedge clock_temp  or negedge reset )

if (!reset)     a <= 2'd0;

else if (a==2'd2)  a<=2'd0;   

  else  a = a+1;

 

always @ (negedge clock_temp  or negedge reset)

if (!reset)     b <= 2'd0;

else if (b == 2'd2) b <= 2'd0;   

   else b <= b+1;

 

always @ (a or b)

if ((a== 2'd0) && (b == 2'd2))  output_clk <= 1'b1;   

else if ((a ==2'd1) &&(b == 2'd1))  output_clk <= 1'b0;   

    else;      

 

assign clk_temp = clock_temp;

 

endmodule 

 

posted on 2013-04-05 20:45  清霜一梦  阅读(270)  评论(0编辑  收藏  举报