eb001/src/main/verilog/backBoardMstTop.v

////////////////////////
//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,
     
  input  [12:0] io_FSMC_addr,
  input  [7:0]  io_FSMC_dataIn,
  output [7:0]  io_FSMC_dataOut,
  output        io_FSMC_dataOEn,
  input         io_FSMC_cen,
  input         io_FSMC_oen,
  input         io_FSMC_wen

);

wire clk_400m;
wire clk_100m;
wire clk_50m;
wire clk_50m_a;
wire clk_10m;

reg        rst_n;

wire       lvds_down_dout;
wire       lvds_up_din;

reg        rstn_d;

wire lock;




always@(posedge clk_10m) begin
  rstn_d <= resetn;
	rst_n <= rstn_d;
end

//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), // trigged by PLL Lock
  .reset_stop(reset_stop), // for DHCEN CE
  .reset_calib(reset_calib), // for IDES and CLKDIV reset
  .set_calib(), 
  .ready()
);

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


Gowin_PLLO Gowin_PLLO(
    .lock(lock),
    .clkouta(clk_400m),
    .clkoutc(clk_50m),
    .clkoutd(clk_100m),
    .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)
);


defparam Inst5_CLKDIVC.DIV_MODE = "5" ;
CLKDIV Inst5_CLKDIVC(
  .RESETN (1'b1  ),
  .HCLKIN (clk_50m),
  .CALIB  (1'b0     ),
  .CLKOUT (clk_10m  )
);


BackBoardMst i_BackBoardMst(
    .io_FSMC_addr(io_FSMC_addr),
    .io_FSMC_dataIn(io_FSMC_dataIn),
    .io_FSMC_dataOut(io_FSMC_dataOut),
    .io_FSMC_dataOEn(io_FSMC_dataOEn),
    .io_FSMC_cen(io_FSMC_cen),
    .io_FSMC_oen(io_FSMC_oen),
    .io_FSMC_wen(io_FSMC_wen),

    .io_reset(~rst_n),

    .io_oser_pclk(clk_10m), 
    .io_oser_fclk(clk_50m),  
    .io_ides_pclk(clk_100m),
    .io_ides_fclk(clk_400m),

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






endmodule