Question

write 3-bit Gray code using jk-flip flop in verilog (behavioral code)

Answer 1

module gray_counter(clk, rst, out);
 input clk, rst;
 output reg [3:0] out;

 reg q0, q1, q2; 
 reg [3:0] count; 

 always @ (posedge clk)
 begin
  if (rst)
   count = 4'b0;
   out = 4'b0;
  else
   count = count + 1'b1;
   q2 = count[3] ^ count[2];
   q1 = count[2] ^ count[1];
   q0 = count[1] ^ count[0];
   out = {count[3], q2, q1, q0};
 end
endmodule

I have attached an image also for your better understanding. Feel free to ask in case of any doubts.

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