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always@(posedge clk)
if(reset)                                              rxd_pad_sig <= 1'b1;
else                                                   rxd_pad_sig <= pad_in;
   

always@(posedge clk)
if(reset)                                              start_detect <= 1'b0;
else
if(start_detect)  
  begin
    if(stop_cnt  && edge_enable )                      start_detect <= !(rxd_pad_sig ^ START_VALUE);
    else
    if(last_cnt)                                       start_detect <= 1'b0;
    else                                               start_detect <= 1'b1;
  end
else
if(!(rxd_pad_sig ^ START_VALUE) )                      start_detect <= 1'b1;
else                                                   start_detect <= start_detect;


always@(posedge clk)
  if(reset)
    begin
    frame_rdy <= 1'b0;
    rdy_del   <= 2'b00;
    end
  else
    begin
    frame_rdy <=  rdy_del[1] ;
    rdy_del   <=  {rdy_del[0],last_cnt};
    end
   
 always@(posedge clk)
   if (reset)                                       frame_avail <= 1'b0;
   else
   if(frame_rdy)                                    frame_avail <= 1'b1;
   else  
   if(rcv_stb)                                      frame_avail <= 1'b0;
   else                                             frame_avail <= frame_avail;

   

always@(posedge clk)
  if(reset)
     begin
          shift_buffer   <=  8'h00;  
          parity_calc    <=  1'b0;
          parity_samp    <=  1'b0;
          frame_parity_error   <=  1'b0;
          frame_error    <=  1'b0;
     end
  else
  if(last_cnt )
      begin
          shift_buffer   <=  next_shift_buffer;  
          parity_calc    <=  next_parity_calc;
          parity_samp    <=  next_parity_samp;
          frame_parity_error   <=  (next_parity_samp ^ next_parity_calc) && parity_enable;
          frame_error    <=  next_frame_error;
      end
  else
     begin
          shift_buffer   <=  shift_buffer;  
          parity_calc    <=  parity_calc;
          parity_samp    <=  parity_samp;
          frame_parity_error   <=  frame_parity_error;
          frame_error    <=  frame_error;
      end


assign    divider_reset = reset || (!start_detect);