module di16_top(
  input clock,
     
  input  lvds_up_din_p,
  input  lvds_up_din_n, 
  output lvds_up_dout_p,
  output lvds_up_dout_n,  
           
  input  lvds_down_din_p,
  input  lvds_down_din_n,  
  output lvds_down_dout_p,
  output lvds_down_dout_n,

  input DCIn,
  output isOnline,
  input  isLast,

  output        LED_PR,
  input  [15:0] in

);

wire clk_400m;
wire clk_400m_a;
wire clk_100m_a;
wire clk_50m_a;
wire clk_10m_a;

wire lock_o;
wire reset_stop;
wire reset_calib;

reg rst_n;
reg rstn_d;

wire resetn;
reg  resetn1=1'b1;
wire timeout_rst;
reg timeout_rst_d1;
reg timeout_rst_d2;
reg timeout_rst_d3;
reg timeout_rst_d4;
reg timeout_rst_d5;
reg timeout_rst_d6;
reg timeout_rst_d7;
reg timeout_rst_d8;

reg [3:0] resetCnt = 4'd0;
always @( posedge clock ) begin
  if( resetCnt != 4'd15 ) begin
    resetCnt <= resetCnt + 4'd1;
  end
end

assign resetn = resetCnt == 4'd15;

always@(posedge clock or negedge resetn) begin
  if(!resetn) begin
    timeout_rst_d1 <= 0;
	  timeout_rst_d2 <= 0;
	  timeout_rst_d3 <= 0;
	  timeout_rst_d4 <= 0;
	  timeout_rst_d5 <= 0;
	  timeout_rst_d6 <= 0;
	  timeout_rst_d7 <= 0;
	  timeout_rst_d8 <= 0;
  end else begin
    timeout_rst_d1 <= timeout_rst;
	  timeout_rst_d2 <= timeout_rst_d1;
	  timeout_rst_d3 <= timeout_rst_d2;
	  timeout_rst_d4 <= timeout_rst_d3;
	  timeout_rst_d5 <= timeout_rst_d4;
	  timeout_rst_d6 <= timeout_rst_d5;
	  timeout_rst_d7 <= timeout_rst_d6;
	  timeout_rst_d8 <= timeout_rst_d7;	
  end
end

always @(posedge clock or negedge resetn) begin
  if(!resetn) begin
    resetn1 <= 1'b1;
  end	else if((timeout_rst_d3 == 1'b0) && (timeout_rst_d2 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else if((timeout_rst_d4 == 1'b0) && (timeout_rst_d3 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else if((timeout_rst_d5 == 1'b0) && (timeout_rst_d4 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else if((timeout_rst_d6 == 1'b0) && (timeout_rst_d5 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else if((timeout_rst_d7 == 1'b0) && (timeout_rst_d6 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else if((timeout_rst_d8 == 1'b0) && (timeout_rst_d7 == 1'b1)) begin
    resetn1 <= 1'b0;
  end else begin
    resetn1 <= 1'b1;
  end  
end


reg [5:0]  delay_io_last=6'b111111;
reg [15:0] counter0=0;
reg        clk_en0;
wire       isLast_temp;
wire       isLast_temp1;

always @(posedge clk_10m_a or negedge resetn) begin
  if(!resetn) begin
    counter0 <= 16'd0;
    clk_en0 <= 1'b0;
  end	
  else if(counter0 == 16'd9999) begin
    counter0 <= 16'd0;
    clk_en0 <= 1'b1;
  end
  else begin
    counter0 <= counter0 + 1;
    clk_en0 <= 1'b0;	 
  end
end


always @(posedge clk_10m_a or negedge resetn) begin
  if(!resetn) begin
    delay_io_last <= 6'b111111;
  end else if(clk_en0 == 1'b1) begin
    delay_io_last[5:1] <= delay_io_last[4:0];
    delay_io_last[0] <= isLast;
  end
end


assign isLast_temp = &{!delay_io_last[5],!delay_io_last[4],!delay_io_last[3],!delay_io_last[2],!delay_io_last[1]};
assign isLast_temp1 = ~isLast_temp;

Gowin_PLLO Gowin_PLLO(
  .lock(lock_o), 
  .clkouta(clk_400m),
  .clkin(clock)
);

wire lvds_down_din;
wire lvds_down_dout;
wire lvds_up_din;
wire lvds_up_dout;

TLVDS_OBUF lvds_downstream_out(
  .O(lvds_down_dout_p),
  .OB(lvds_down_dout_n),
  .I(lvds_down_dout)
);


TLVDS_IBUF lvds_downstream_in(
  .O(lvds_down_din),
  .I(lvds_down_din_p),
  .IB(lvds_down_din_n)
);


TLVDS_OBUF lvds_upstream_out(
  .O(lvds_up_dout_p),
  .OB(lvds_up_dout_n),
  .I(lvds_up_dout)
);


TLVDS_IBUF lvds_upstream_in(
  .O(lvds_up_din),
  .I(lvds_up_din_p),
  .IB(lvds_up_din_n)
);


DHCEN dhcen_inst2 (
  .CLKIN(clk_400m),
  .CE(reset_stop),
  .CLKOUT(clk_400m_a)
);


//reset sync module, all the IDES/OSER and related CLKDIV MUST be reset by this module
oser_rst u_oser_rst(
  .clk_in(clock), // or any other speed comparble with fabric, DO NOT use HCLK as fabric cannot work at so high speed.
  .rst_n(resetn && resetn1),
  .pll_lock(lock_o), // trigged by PLL Lock
  .reset_stop(reset_stop), // for DHCEN CE
  .reset_calib(reset_calib), // for IDES and CLKDIV reset
  .set_calib(), 
  .ready()
);


defparam Inst4_CLKDIVC.DIV_MODE="4";
defparam Inst4_CLKDIVC.GSREN="false";
CLKDIV Inst4_CLKDIVC(
  .RESETN (~reset_calib),
  .HCLKIN (clk_400m_a),
  .CALIB  (1'b0     ),
  .CLKOUT (clk_100m_a)
);


defparam Inst2_CLKDIVC.DIV_MODE="2";
defparam Inst2_CLKDIVC.GSREN="false";
CLKDIV Inst2_CLKDIVC(
  .RESETN (~reset_calib),
  .HCLKIN (clk_100m_a),
  .CALIB  (1'b0     ),
  .CLKOUT (clk_50m_a)
);


defparam Inst5_CLKDIVC.DIV_MODE="5";
defparam Inst5_CLKDIVC.GSREN="false";
CLKDIV Inst5_CLKDIVC(
  .RESETN (~reset_calib),
  .HCLKIN (clk_50m_a),
  .CALIB  (1'b0     ),
  .CLKOUT (clk_10m_a)
);

wire [7:0] downstream_rx_data_out;
wire downstream_rx_data_valid;
wire downstream_rx_crc_valid;
wire downstream_rx_crc_err;
wire upstream_tx_data_ready;
wire [7:0] upstream_tx_data_in;

wire downstream_rx_cdr_err;
wire upstream_rx_cdr_err;



lvds_bus_slave_top i_lvds_bus_slave(
  .rst_n(resetn && resetn1),
  .reset_calib(reset_calib),
  .oser_pclk(clk_10m_a),
  .oser_fclk(clk_50m_a),
  .ides_pclk(clk_100m_a),
  .ides_fclk(clk_400m_a),
  .timeout_rst(timeout_rst), //add 240523

  .lvds_down_din(lvds_down_din),
  .lvds_down_dout(lvds_down_dout),
  .lvds_up_din(lvds_up_din),
  .lvds_up_dout(lvds_up_dout),
    
  .downstream_rx_data_valid(downstream_rx_data_valid), 
    .downstream_rx_unicast_pkg_valid(),
  .downstream_rx_data_out(downstream_rx_data_out),
  .downstream_rx_crc_valid(downstream_rx_crc_valid),
  .downstream_rx_crc_err(downstream_rx_crc_err),
    .downstream_rx_crc_err_counter(),
  .downstream_rx_cdr_err(downstream_rx_cdr_err),
    .downstream_sync(),
  .upstream_tx_data_ready(upstream_tx_data_ready),
    .upstream_tx_unicast_pkg_ready(),
  .upstream_tx_data_in(upstream_tx_data_in),
    .upstream_rx_crc_valid(),
    .upstream_rx_crc_err(),
    .upstream_rx_crc_err_counter(),
  .upstream_rx_cdr_err(upstream_rx_cdr_err),

    .local_slave_id(),
    .test_downstream_rx_10b_data(),
    .test_downstream_rx_8b_data(),
    .test_downstream_rx_state_machine(),
    .test_downstream_tx_en(),
    .test_downstream_tx_8b_data(),
    .test_downstream_tx_10b_data(),
    .test_upstream_rx_10b_data(),
    .test_upstream_rx_8b_data(),
    .test_upstream_rx_state_machine(),
    .test_upstream_tx_en(),
    .test_upstream_tx_8b_data(),
    .test_upstream_tx_10b_data()
  );

DIn16 i_din16(
  .reset(~resetn),
  .clock(clk_10m_a),

  .io_isOnline(isOnline),
  .io_isLast(isLast_temp1),
  .io_DCIn(DCIn),

  .param_vendorID(`VENDORID),
  .param_moduleID(`MODULEID),
  .param_hwVersion(`HWVERSION),
  .param_swVersion(`SWVERSION),
  .param_serial(`SERIAL),
  .LED_PR(LED_PR),
  .in(in),

  .io_lvdsSlv_downstream_rx_data_out(downstream_rx_data_out),
  .io_lvdsSlv_downstream_rx_data_valid(downstream_rx_data_valid),
  .io_lvdsSlv_downstream_rx_crc_valid(downstream_rx_crc_valid),
  .io_lvdsSlv_downstream_rx_crc_err(downstream_rx_crc_err),
  .io_lvdsSlv_upstream_tx_data_ready(upstream_tx_data_ready),
  .io_lvdsSlv_upstream_tx_data_in(upstream_tx_data_in),
  .io_lvdsSlv_downstream_rx_cdr_err(downstream_rx_cdr_err),
  .io_lvdsSlv_upstream_rx_cdr_err(upstream_rx_cdr_err)
);

endmodule