七分频

module Freq_divide
(
    input clk,
    input rst_n,
    output clk_divide
 );
 
//----------count the posedge---------------------
reg [2:0] cnt_p;
reg clk_p;

always @ (posedge clk or negedge rst_n) 
if(!rst_n) 
    cnt_p <= 3'd0;
else if(cnt_p == 3'd6)
    cnt_p <= 3'd0;
else 
    cnt_p <= cnt_p + 1'b1;

always @ (posedge clk or negedge rst_n) 
if(!rst_n)     
    clk_p <= 1'b0;
else if((cnt_p == 3'd3) || (cnt_p == 3'd6))
    clk_p <= ~ clk_p;
//---------------------------------------------

//----------count the negedge------------------
reg [2:0] cnt_n;
reg clk_n;

always @ (negedge clk or negedge rst_n) 
if(!rst_n) 
    cnt_n <= 3'd0;
else if(cnt_n == 3'd6) 
    cnt_n <= 3'd0;
else
    cnt_n <= cnt_n + 1'b1;
    
always @ (negedge clk or negedge rst_n) 
if(!rst_n) 
    clk_n <= 1'b0;
else if((cnt_n == 3'd3) || (cnt_n == 3'd6)) 
    clk_n <= ~clk_n;
//----------------------------------------------

assign clk_divide = clk_p | clk_n;

    
endmodule

3:4变成3.5:3.5