题解 | #占空比50%的奇数分频#

`timescale 1ns/1ns

module odo_div_or
(
  input    wire  rst ,
  input    wire  clk_in,
  output   wire  clk_out7
);
reg [2:0] cnt_p;
reg [2:0] cnt_n;

always@(posedge clk_in or negedge rst)begin
  if(!rst)
    cnt_p <= 1'b0;
  else if(cnt_p == 3'b110)
    cnt_p <= 1'b0;
  else
    cnt_p <= cnt_p + 1'b1;  
end

always@(negedge clk_in or negedge rst)begin
  if(!rst)
    cnt_n <= 1'b0;
  else if(cnt_n == 3'b110)
    cnt_n <= 1'b0;
  else
    cnt_n <= cnt_n + 1'b1;
end

assign clk_out7 = (((cnt_n > 2'b11) || (cnt_n==1'b0))&&(cnt_p >= 2'b11))?1'b1:1'b0;
endmodule