// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//     - Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     - Redistributions in binary form must reproduce the above copyright
//       notice, this list of conditions and the following disclaimer in
//       the documentation and/or other materials provided with the
//       distribution.
//     - Neither the name of Analog Devices, Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//     - The use of this software may or may not infringe the patent rights
//       of one or more patent holders.  This license does not release you
//       from the requirement that you obtain separate licenses from these
//       patent holders to use this software.
//     - Use of the software either in source or binary form, must be run
//       on or directly connected to an Analog Devices Inc. component.
//
// THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
// INCLUDING, BUT NOT LIMITED TO, NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A
// PARTICULAR PURPOSE ARE DISCLAIMED.
//
// IN NO EVENT SHALL ANALOG DEVICES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, INTELLECTUAL PROPERTY
// RIGHTS, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
// BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************

`timescale 1ns/100ps

module system_top (

  sys_rst,
  sys_clk_p,
  sys_clk_n,

  uart_sin,
  uart_sout,

  ddr3_addr,
  ddr3_ba,
  ddr3_cas_n,
  ddr3_ck_n,
  ddr3_ck_p,
  ddr3_cke,
  ddr3_cs_n,
  ddr3_dm,
  ddr3_dq,
  ddr3_dqs_n,
  ddr3_dqs_p,
  ddr3_odt,
  ddr3_ras_n,
  ddr3_reset_n,
  ddr3_we_n,

  sgmii_rxp,
  sgmii_rxn,
  sgmii_txp,
  sgmii_txn,

  phy_rstn,
  mgt_clk_p,
  mgt_clk_n,
  mdio_mdc,
  mdio_mdio,

  fan_pwm,

  linear_flash_addr,
  linear_flash_adv_ldn,
  linear_flash_ce_n,
  linear_flash_oen,
  linear_flash_wen,
  linear_flash_dq_io,

  gpio_lcd,
  gpio_led,
  gpio_sw,

  iic_rstn,
  iic_scl,
  iic_sda,

  dac_clk_in_p,
  dac_clk_in_n,
  dac_clk_out_p,
  dac_clk_out_n,
  dac_frame_out_p,
  dac_frame_out_n,
  dac_data_out_p,
  dac_data_out_n,

  adc_clk_in_p,
  adc_clk_in_n,
  adc_or_in_p,
  adc_or_in_n,
  adc_data_in_p,
  adc_data_in_n,

  ref_clk_out_p,
  ref_clk_out_n,

  hdmi_out_clk,
  hdmi_hsync,
  hdmi_vsync,
  hdmi_data_e,
  hdmi_data,

  spdif);

  input           sys_rst;
  input           sys_clk_p;
  input           sys_clk_n;

  input           uart_sin;
  output          uart_sout;

  output  [13:0]  ddr3_addr;
  output  [ 2:0]  ddr3_ba;
  output          ddr3_cas_n;
  output  [ 0:0]  ddr3_ck_n;
  output  [ 0:0]  ddr3_ck_p;
  output  [ 0:0]  ddr3_cke;
  output  [ 0:0]  ddr3_cs_n;
  output  [ 7:0]  ddr3_dm;
  inout   [63:0]  ddr3_dq;
  inout   [ 7:0]  ddr3_dqs_n;
  inout   [ 7:0]  ddr3_dqs_p;
  output  [ 0:0]  ddr3_odt;
  output          ddr3_ras_n;
  output          ddr3_reset_n;
  output          ddr3_we_n;

  input           sgmii_rxp;
  input           sgmii_rxn;
  output          sgmii_txp;
  output          sgmii_txn;

  output          phy_rstn;
  input           mgt_clk_p;
  input           mgt_clk_n;
  output          mdio_mdc;
  inout           mdio_mdio;

  output          fan_pwm;

  output  [26:1]  linear_flash_addr;
  output          linear_flash_adv_ldn;
  output          linear_flash_ce_n;
  output          linear_flash_oen;
  output          linear_flash_wen;
  inout   [15:0]  linear_flash_dq_io;

  output  [ 6:0]  gpio_lcd;
  output  [ 7:0]  gpio_led;
  input   [12:0]  gpio_sw;

  output          iic_rstn;
  inout           iic_scl;
  inout           iic_sda;

  input           dac_clk_in_p;
  input           dac_clk_in_n;
  output          dac_clk_out_p;
  output          dac_clk_out_n;
  output          dac_frame_out_p;
  output          dac_frame_out_n;
  output   [15:0] dac_data_out_p;
  output   [15:0] dac_data_out_n;

  input           adc_clk_in_p;
  input           adc_clk_in_n;
  input           adc_or_in_p;
  input           adc_or_in_n;
  input   [13:0]  adc_data_in_p;
  input   [13:0]  adc_data_in_n;

  output          ref_clk_out_p;
  output          ref_clk_out_n;
  output          hdmi_out_clk;
  output          hdmi_hsync;
  output          hdmi_vsync;
  output          hdmi_data_e;
  output  [35:0]  hdmi_data;

  output          spdif;

  // internal registers

  reg     [63:0]  dac_ddata_0 = 'd0;
  reg     [63:0]  dac_ddata_1 = 'd0;
  reg             dac_dma_rd = 'd0;
  reg             adc_data_cnt = 'd0;
  reg             adc_dma_wr = 'd0;
  reg     [31:0]  adc_dma_wdata = 'd0;

  // internal signals

  wire            dac_clk;
  wire            dac_valid_0;
  wire            dac_enable_0;
  wire            dac_valid_1;
  wire            dac_enable_1;
  wire    [63:0]  dac_dma_rdata;
  wire            adc_clk;
  wire            adc_valid_0;
  wire            adc_enable_0;
  wire    [15:0]  adc_data_0;
  wire            adc_valid_1;
  wire            adc_enable_1;
  wire    [15:0]  adc_data_1;
  wire            ref_clk;
  wire            oddr_ref_clk;
  wire    [31:0]  mb_intrs;

  // assignments

  assign fan_pwm = 1'b1;

  // instantiations

  ODDR #(
    .DDR_CLK_EDGE ("SAME_EDGE"),
    .INIT (1'b0),
    .SRTYPE ("ASYNC"))
  i_oddr_ref_clk (
    .S (1'b0),
    .CE (1'b1),
    .R (1'b0),
    .C (ref_clk),
    .D1 (1'b1),
    .D2 (1'b0),
    .Q (oddr_ref_clk));

  OBUFDS i_obufds_ref_clk (
    .I (oddr_ref_clk),
    .O (ref_clk_out_p),
    .OB (ref_clk_out_n));

  always @(posedge dac_clk) begin
    dac_dma_rd <= dac_valid_0 & dac_enable_0;
    dac_ddata_1[63:48] <= dac_dma_rdata[63:48];
    dac_ddata_1[47:32] <= dac_dma_rdata[63:48];
    dac_ddata_1[31:16] <= dac_dma_rdata[31:16];
    dac_ddata_1[15: 0] <= dac_dma_rdata[31:16];
    dac_ddata_0[63:48] <= dac_dma_rdata[47:32];
    dac_ddata_0[47:32] <= dac_dma_rdata[47:32];
    dac_ddata_0[31:16] <= dac_dma_rdata[15: 0];
    dac_ddata_0[15: 0] <= dac_dma_rdata[15: 0];
  end

  always @(posedge adc_clk) begin 
    adc_data_cnt <= ~adc_data_cnt;
    case ({adc_enable_1, adc_enable_0})
      2'b10: begin
        adc_dma_wr <= adc_data_cnt;
        adc_dma_wdata <= {adc_data_1, adc_dma_wdata[31:16]};
      end
      2'b01: begin
        adc_dma_wr <= adc_data_cnt;
        adc_dma_wdata <= {adc_data_0, adc_dma_wdata[31:16]};
      end
      default: begin
        adc_dma_wr <= 1'b1;
        adc_dma_wdata <= {adc_data_1, adc_data_0};
      end
    endcase
  end

  system_wrapper i_system_wrapper (
    .ddr3_addr (ddr3_addr),
    .ddr3_ba (ddr3_ba),
    .ddr3_cas_n (ddr3_cas_n),
    .ddr3_ck_n (ddr3_ck_n),
    .ddr3_ck_p (ddr3_ck_p),
    .ddr3_cke (ddr3_cke),
    .ddr3_cs_n (ddr3_cs_n),
    .ddr3_dm (ddr3_dm),
    .ddr3_dq (ddr3_dq),
    .ddr3_dqs_n (ddr3_dqs_n),
    .ddr3_dqs_p (ddr3_dqs_p),
    .ddr3_odt (ddr3_odt),
    .ddr3_ras_n (ddr3_ras_n),
    .ddr3_reset_n (ddr3_reset_n),
    .ddr3_we_n (ddr3_we_n),
    .linear_flash_addr (linear_flash_addr),
    .linear_flash_adv_ldn (linear_flash_adv_ldn),
    .linear_flash_ce_n (linear_flash_ce_n),
    .linear_flash_oen (linear_flash_oen),
    .linear_flash_wen (linear_flash_wen),
    .linear_flash_dq_io(linear_flash_dq_io),
    .gpio_lcd_tri_o (gpio_lcd),
    .gpio_led_tri_o (gpio_led),
    .gpio_sw_tri_i (gpio_sw),
    .hdmi_data (hdmi_data),
    .hdmi_data_e (hdmi_data_e),
    .hdmi_hsync (hdmi_hsync),
    .hdmi_out_clk (hdmi_out_clk),
    .hdmi_vsync (hdmi_vsync),
    .adc_clk (adc_clk),
    .adc_clk_in_n (adc_clk_in_n),
    .adc_clk_in_p (adc_clk_in_p),
    .adc_data_0 (adc_data_0),
    .adc_data_1 (adc_data_1),
    .adc_data_in_n (adc_data_in_n),
    .adc_data_in_p (adc_data_in_p),
    .adc_dma_sync (1'b1),
    .adc_dma_wdata (adc_dma_wdata),
    .adc_dma_wr (adc_dma_wr),
    .adc_enable_0 (adc_enable_0),
    .adc_enable_1 (adc_enable_1),
    .adc_or_in_n (adc_or_in_n),
    .adc_or_in_p (adc_or_in_p),
    .adc_valid_0 (adc_valid_0),
    .adc_valid_1 (adc_valid_1),
    .dac_clk (dac_clk),
    .dac_clk_in_n (dac_clk_in_n),
    .dac_clk_in_p (dac_clk_in_p),
    .dac_clk_out_n (dac_clk_out_n),
    .dac_clk_out_p (dac_clk_out_p),
    .dac_data_out_n (dac_data_out_n),
    .dac_data_out_p (dac_data_out_p),
    .dac_ddata_0 (dac_ddata_0),
    .dac_ddata_1 (dac_ddata_1),
    .dac_dma_rd (dac_dma_rd),
    .dac_dma_rdata (dac_dma_rdata),
    .dac_enable_0 (dac_enable_0),
    .dac_enable_1 (dac_enable_1),
    .dac_frame_out_n (dac_frame_out_n),
    .dac_frame_out_p (dac_frame_out_p),
    .dac_valid_0 (dac_valid_0),
    .dac_valid_1 (dac_valid_1),
    .ref_clk (ref_clk),
    .iic_main_scl_io (iic_scl),
    .iic_main_sda_io (iic_sda),
    .iic_rstn (iic_rstn),
    .mb_intr_10 (mb_intrs[10]),
    .mb_intr_11 (mb_intrs[11]),
    .mb_intr_14 (mb_intrs[14]),
    .mb_intr_15 (mb_intrs[15]),
    .mb_intr_16 (mb_intrs[16]),
    .mb_intr_17 (mb_intrs[17]),
    .mb_intr_18 (mb_intrs[18]),
    .mb_intr_19 (mb_intrs[19]),
    .mb_intr_20 (mb_intrs[20]),
    .mb_intr_21 (mb_intrs[21]),
    .mb_intr_22 (mb_intrs[22]),
    .mb_intr_23 (mb_intrs[23]),
    .mb_intr_24 (mb_intrs[24]),
    .mb_intr_25 (mb_intrs[25]),
    .mb_intr_26 (mb_intrs[26]),
    .mb_intr_27 (mb_intrs[27]),
    .mb_intr_28 (mb_intrs[28]),
    .mb_intr_29 (mb_intrs[29]),
    .mb_intr_30 (mb_intrs[30]),
    .mb_intr_31 (mb_intrs[31]),
    .mdio_mdc (mdio_mdc),
    .mdio_mdio_io (mdio_mdio),
    .mgt_clk_clk_n (mgt_clk_n),
    .mgt_clk_clk_p (mgt_clk_p),
    .phy_rstn (phy_rstn),
    .sgmii_rxn (sgmii_rxn),
    .sgmii_rxp (sgmii_rxp),
    .sgmii_txn (sgmii_txn),
    .sgmii_txp (sgmii_txp),
    .spdif (spdif),
    .sys_clk_n (sys_clk_n),
    .sys_clk_p (sys_clk_p),
    .sys_rst (sys_rst),
    .uart_sin (uart_sin),
    .uart_sout (uart_sout));

endmodule

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