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//*****************************************************************************

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//*****************************************************************************

//   ____  ____

//  /   /\/   /

// /___/  \  /   Vendor             : Xilinx

// \   \   \/    Version            : 3.6.1

//  \   \        Application        : MIG

//  /   /        Filename           : s3adsp_ddr2_infrastructure_top.v

// /___/   /\    Date Last Modified : $Date: 2010/11/26 18:25:41 $

// \   \  /  \   Date Created       : Mon May 2 2005

//  \___\/\___\

// Device       : Spartan-3/3A/3A-DSP

// Design Name  : DDR2 SDRAM

// Purpose      : This module has instantiations clk_dcm and cal_top.

//                This generate reset signals.

//*****************************************************************************

`timescale 1ns/100ps

`include "s3adsp_ddr2_parameters_0.v"

module s3adsp_ddr2_infrastructure_top

  (

   input        sys_clk,

   input        sys_clkb,

   input        sys_clk_in,

   input        reset_in_n,

   output [4:0] delay_sel_val1_val,

   output       sys_rst_val,

   output       sys_rst90_val,

   output       sys_rst180_val,

   output reg   wait_200us_rout,

   output       clk_int_val,

   output       clk90_int_val,

   // debug signals

   output [4:0] dbg_phase_cnt,

   output [5:0] dbg_cnt,

   output       dbg_trans_onedtct,

   output       dbg_trans_twodtct,

   output       dbg_enb_trans_two_dtct

   );

   wire       user_rst;

   wire       clk_int;

   wire       clk90_int;

   wire       dcm_lock;

   wire       sys_clk_ibuf;

   wire       clk_int_val1;

   wire       clk_int_val2;

   wire       clk90_int_val1;

   wire       clk90_int_val2;

   wire [4:0] delay_sel_val;

   wire       user_cal_rst;

   reg        sys_rst_o;

   reg        sys_rst_1;

   reg        sys_rst;

   reg        sys_rst90_o;

   reg        sys_rst90_1;

   reg        sys_rst90;

   reg        sys_rst180_o;

   reg        sys_rst180_1;

   reg        sys_rst180;

   reg [15:0] counter200;

   reg        wait_200us;

   reg        wait_clk90;

   reg        wait_clk270;

   reg        wait_200us_r;

   generate

   if(`CLK_TYPE == "DIFFERENTIAL") begin : DIFF_ENDED_CLKS_INST

     IBUFGDS_LVDS_25  SYS_CLK_INST

       (

        .I  (sys_clk),

        .IB (sys_clkb),

        .O  (sys_clk_ibuf)

        );

   end else if(`CLK_TYPE == "SINGLE_ENDED") begin : SINGLE_ENDED_CLKS_INST

/*

     IBUFG  SYS_CLK_INST

       (

        .I  (sys_clk_in),

        .O  (sys_clk_ibuf)

        );

 */

      assign sys_clk_ibuf = sys_clk_in;

   end

   endgenerate

   assign clk_int_val        = clk_int;

   assign clk90_int_val      = clk90_int;

   assign sys_rst_val        = sys_rst;

   assign sys_rst90_val      = sys_rst90;

   assign sys_rst180_val     = sys_rst180;

   assign delay_sel_val1_val = delay_sel_val;

   assign clk_int_val1       = clk_int;

   assign clk90_int_val1     = clk90_int;

   assign clk_int_val2       = clk_int_val1;

   assign clk90_int_val2     = clk90_int_val1;

   assign user_rst           = `RESET_ACTIVE_LOW  == 1'b1 ?

                                ~reset_in_n :  reset_in_n;

   assign user_cal_rst       = `RESET_ACTIVE_LOW  == 1'b1 ?

                                reset_in_n : ~reset_in_n;

   always @(posedge clk_int_val2) begin

      if(user_rst == 1'b1 || dcm_lock == 1'b0) begin

         wait_200us <= 1'b1;

         counter200     <= 16'd0;

      end

      else

`ifdef simulation

        wait_200us <= 1'b0;

`else

      if ( counter200 < 16'd33400 ) begin

         counter200 <= counter200 + 1'b1;

         wait_200us <= 1'b1;

      end

      else begin

         counter200 <= counter200;

         wait_200us <= 1'b0;

      end

`endif

   end

   always @( posedge clk_int_val2 )

     wait_200us_r <= wait_200us;

   always @( posedge clk_int_val2 )

     wait_200us_rout <= wait_200us;

   always @(negedge clk90_int_val2) begin

      if(user_rst == 1'b1 || dcm_lock == 1'b0)

        wait_clk270 <= 1'b1;

      else

        wait_clk270 <= wait_200us_r;

   end

   always @(posedge clk90_int_val2) begin

      wait_clk90 <= wait_clk270;

   end

   always@(posedge clk_int_val2) begin

      if(user_rst == 1'b1 || dcm_lock == 1'b0 || wait_200us_r == 1'b1 ) begin

         sys_rst_o <= 1'b1;

         sys_rst_1 <= 1'b1;

         sys_rst   <= 1'b1;

      end

      else begin

         sys_rst_o <= 1'b0;

         sys_rst_1 <= sys_rst_o;

         sys_rst   <= sys_rst_1;

      end

   end

   always@(posedge clk90_int_val2) begin

      if (user_rst == 1'b1 || dcm_lock == 1'b0 || wait_clk90 == 1'b1) begin

         sys_rst90_o <= 1'b1;

         sys_rst90_1 <= 1'b1;

         sys_rst90   <= 1'b1;

      end

      else begin

         sys_rst90_o <= 1'b0;

         sys_rst90_1 <= sys_rst90_o;

         sys_rst90   <= sys_rst90_1;

      end

   end

   always@(negedge clk_int_val2) begin

      if (user_rst == 1'b1 || dcm_lock == 1'b0 || wait_clk270 == 1'b1) begin

         sys_rst180_o <= 1'b1;

         sys_rst180_1 <= 1'b1;

         sys_rst180   <= 1'b1;

      end

      else begin

         sys_rst180_o <= 1'b0;

         sys_rst180_1 <= sys_rst180_o;

         sys_rst180   <= sys_rst180_1;

      end

   end

   s3adsp_ddr2_clk_dcm clk_dcm0

     (

      .input_clk   (sys_clk_ibuf),

      .rst         (user_rst),

      .clk         (clk_int),

      .clk90       (clk90_int),

      .dcm_lock    (dcm_lock)

      );

   s3adsp_ddr2_cal_top cal_top0

     (

      .clk0                   (clk_int_val2),

      .clk0dcmlock            (dcm_lock),

      .reset                  (user_cal_rst),

      .tapfordqs              (delay_sel_val),

      .dbg_phase_cnt          (dbg_phase_cnt),

      .dbg_cnt                (dbg_cnt),

      .dbg_trans_onedtct      (dbg_trans_onedtct),

      .dbg_trans_twodtct      (dbg_trans_twodtct),

      .dbg_enb_trans_two_dtct (dbg_enb_trans_two_dtct)

      );

endmodule