// ***************************************************************************
// ***************************************************************************
// Copyright (C) 2017-2023 Analog Devices, Inc. All rights reserved.
//
// In this HDL repository, there are many different and unique modules, consisting
// of various HDL (Verilog or VHDL) components. The individual modules are
// developed independently, and may be accompanied by separate and unique license
// terms.
//
// The user should read each of these license terms, and understand the
// freedoms and responsibilities that he or she has by using this source/core.
//
// This core is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE.
//
// Redistribution and use of source or resulting binaries, with or without modification
// of this file, are permitted under one of the following two license terms:
//
//   1. The GNU General Public License version 2 as published by the
//      Free Software Foundation, which can be found in the top level directory
//      of this repository (LICENSE_GPL2), and also online at:
//      <https://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
//
// OR
//
//   2. An ADI specific BSD license, which can be found in the top level directory
//      of this repository (LICENSE_ADIBSD), and also on-line at:
//      https://github.com/analogdevicesinc/hdl/blob/master/LICENSE_ADIBSD
//      This will allow to generate bit files and not release the source code,
//      as long as it attaches to an ADI device.
//
// ***************************************************************************
// ***************************************************************************

`timescale 1ns/100ps

module system_top (

  input                   sys_rst,
  input                   sys_clk_p,
  input                   sys_clk_n,

  input                   uart_sin,
  output                  uart_sout,

  output                  ddr4_act_n,
  output      [16:0]      ddr4_addr,
  output      [ 1:0]      ddr4_ba,
  output      [ 0:0]      ddr4_bg,
  output                  ddr4_ck_p,
  output                  ddr4_ck_n,
  output      [ 0:0]      ddr4_cke,
  output      [ 0:0]      ddr4_cs_n,
  inout       [ 7:0]      ddr4_dm_n,
  inout       [63:0]      ddr4_dq,
  inout       [ 7:0]      ddr4_dqs_p,
  inout       [ 7:0]      ddr4_dqs_n,
  output      [ 0:0]      ddr4_odt,
  output                  ddr4_reset_n,

  output                  mdio_mdc,
  inout                   mdio_mdio,
  input                   phy_clk_p,
  input                   phy_clk_n,
  output                  phy_rst_n,
  input                   phy_rx_p,
  input                   phy_rx_n,
  output                  phy_tx_p,
  output                  phy_tx_n,

  output                  fan_pwm,
  inout       [16:0]      gpio_bd,

  inout                   iic_scl,
  inout                   iic_sda,

  input                   rx_clk_in_p,
  input                   rx_clk_in_n,
  input                   rx_frame_in_p,
  input                   rx_frame_in_n,
  input       [ 5:0]      rx_data_in_p,
  input       [ 5:0]      rx_data_in_n,
  output                  tx_clk_out_p,
  output                  tx_clk_out_n,
  output                  tx_frame_out_p,
  output                  tx_frame_out_n,
  output      [ 5:0]      tx_data_out_p,
  output      [ 5:0]      tx_data_out_n,

  output                  enable,
  output                  txnrx,

  output                  gpio_resetb,
  output                  gpio_sync,
  output                  gpio_en_agc,
  output      [ 3:0]      gpio_ctl,
  input       [ 7:0]      gpio_status,

  output                  spi_csn_0,
  output                  spi_clk,
  output                  spi_mosi,
  input                   spi_miso
);

  // internal signals

  wire    [63:0]  gpio_i;
  wire    [63:0]  gpio_o;
  wire    [63:0]  gpio_t;
  wire    [ 7:0]  spi_csn;

  // defaults

  assign fan_pwm = 1'b1;
  assign spi_csn_0 = spi_csn[0];

  // instantiations

  assign gpio_resetb = gpio_o[46:46];
  assign gpio_sync = gpio_o[45:45];
  assign gpio_en_agc = gpio_o[44:44];
  assign gpio_ctl = gpio_o[43:40];

  ad_iobuf #(
    .DATA_WIDTH(17)
  ) i_iobuf_bd (
    .dio_t (gpio_t[16:0]),
    .dio_i (gpio_o[16:0]),
    .dio_o (gpio_i[16:0]),
    .dio_p (gpio_bd));

  assign gpio_i[63:40] = gpio_o[63:40];
  assign gpio_i[39:32] = gpio_status;
  assign gpio_i[31:17] = gpio_o[31:17];

  system_wrapper i_system_wrapper (
    .c0_ddr4_act_n (ddr4_act_n),
    .c0_ddr4_adr (ddr4_addr),
    .c0_ddr4_ba (ddr4_ba),
    .c0_ddr4_bg (ddr4_bg),
    .c0_ddr4_ck_c (ddr4_ck_n),
    .c0_ddr4_ck_t (ddr4_ck_p),
    .c0_ddr4_cke (ddr4_cke),
    .c0_ddr4_cs_n (ddr4_cs_n),
    .c0_ddr4_dm_n (ddr4_dm_n),
    .c0_ddr4_dq (ddr4_dq),
    .c0_ddr4_dqs_c (ddr4_dqs_n),
    .c0_ddr4_dqs_t (ddr4_dqs_p),
    .c0_ddr4_odt (ddr4_odt),
    .c0_ddr4_reset_n (ddr4_reset_n),
    .enable (enable),
    .gpio0_i (gpio_i[31:0]),
    .gpio0_o (gpio_o[31:0]),
    .gpio0_t (gpio_t[31:0]),
    .gpio1_i (gpio_i[63:32]),
    .gpio1_o (gpio_o[63:32]),
    .gpio1_t (gpio_t[63:32]),
    .iic_main_scl_io (iic_scl),
    .iic_main_sda_io (iic_sda),
    .mdio_mdc (mdio_mdc),
    .mdio_mdio_io (mdio_mdio),
    .phy_clk_clk_n (phy_clk_n),
    .phy_clk_clk_p (phy_clk_p),
    .phy_rst_n (phy_rst_n),
    .phy_sd (1'b1),
    .sgmii_rxn (phy_rx_n),
    .sgmii_rxp (phy_rx_p),
    .sgmii_txn (phy_tx_n),
    .sgmii_txp (phy_tx_p),

    .spi_clk_i (spi_clk),
    .spi_clk_o (spi_clk),
    .spi_csn_i (spi_csn),
    .spi_csn_o (spi_csn),
    .spi_sdi_i (spi_miso),
    .spi_sdo_i (spi_mosi),
    .spi_sdo_o (spi_mosi),
    .sys_clk_clk_n (sys_clk_n),
    .sys_clk_clk_p (sys_clk_p),
    .sys_rst (sys_rst),

    .rx_clk_in_n (rx_clk_in_n),
    .rx_clk_in_p (rx_clk_in_p),
    .rx_data_in_n (rx_data_in_n),
    .rx_data_in_p (rx_data_in_p),
    .rx_frame_in_n (rx_frame_in_n),
    .rx_frame_in_p (rx_frame_in_p),

    .tdd_sync_i (1'b0),
    .tdd_sync_o (),
    .tdd_sync_t (),

    .tx_clk_out_n (tx_clk_out_n),
    .tx_clk_out_p (tx_clk_out_p),
    .tx_data_out_n (tx_data_out_n),
    .tx_data_out_p (tx_data_out_p),
    .tx_frame_out_n (tx_frame_out_n),
    .tx_frame_out_p (tx_frame_out_p),
    .txnrx (txnrx),
    .up_enable (gpio_o[47]),
    .up_txnrx (gpio_o[48]),
    .uart_sin (uart_sin),
    .uart_sout (uart_sout));

endmodule