////////////////////////
//LVDS-BUS SYSTEM DEMO//
////////////////////////

module master_top(
  input resetn,
  input clock, 
    
  input lvds_up_din_p,
  input lvds_up_din_n, 
           
  output lvds_down_dout_p,
  output lvds_down_dout_n,

  inout  [15:0] io_FSMC_AD,

  input         io_FSMC_cs,
  input         io_FSMC_rd,
  input         io_FSMC_wr,
  input         io_FSMC_adv
);

wire [15:0] io_FSMC_ADIn;
wire [15:0] io_FSMC_ADOut;
wire        io_FSMC_ADOEn;

wire clk_400m;
wire clk_400m_a;
wire clk_100m;
wire clk_100m_a;
wire clk_50m;
wire clk_50m_a;
wire clk_10m_a;

reg        rst_n;

wire       lvds_down_dout;
wire       lvds_up_din;

reg        rstn_d;

wire       reset_calib;
wire lock_o;
wire       reset_stop;

always@(posedge clk_10m_a) begin
  rstn_d <= resetn;
	rst_n <= rstn_d;
end


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

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


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



DHCEN dhcen_inst (
  .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(rst_n),
  .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)
);






BackBoardMst i_BackBoardMst(
    .io_FSMC_ADIn (io_FSMC_ADIn),
    .io_FSMC_ADOut(io_FSMC_ADOut),
    .io_FSMC_ADOEn(io_FSMC_ADOEn),
    .io_FSMC_cs(io_FSMC_cs),
    .io_FSMC_rd(io_FSMC_rd),
    .io_FSMC_wr(io_FSMC_wr),
    .io_FSMC_adv(io_FSMC_adv),

    .reset(~rst_n),
    .clock(clk_10m_a),
    .io_reset_calib(reset_calib),
    .io_oser_pclk(clk_10m_a),
    .io_oser_fclk(clk_50m_a),
    .io_ides_pclk(clk_100m_a),
    .io_ides_fclk(clk_400m_a),

    .io_lvds_down_dout(lvds_down_dout),
    .io_lvds_up_din(lvds_up_din)
);



 generate
   for( genvar i = 0; i < 16; i = i + 1 ) begin
     IOBUF uut(
       .O(io_FSMC_ADIn[i]),
       .IO(io_FSMC_AD[i]),
       .I(io_FSMC_ADOut[i]),
       .OEN(~io_FSMC_ADOEn)
     );
   end
 endgenerate


endmodule