// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms. 
// The user should keep this in in mind while exploring these cores. 
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
//  (at the option of the user):
//
//   1. The GNU General Public License version 2 as published by the
//      Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
//   2.  An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************

`timescale 1ns/100ps

module system_top (

  // clock and resets

  input             sys_clk,
  input             sys_resetn,

  // ddr3

  output            ddr3_clk_p,
  output            ddr3_clk_n,
  output  [ 13:0]   ddr3_a,
  output  [  2:0]   ddr3_ba,
  output            ddr3_cke,
  output            ddr3_cs_n,
  output            ddr3_odt,
  output            ddr3_reset_n,
  output            ddr3_we_n,
  output            ddr3_ras_n,
  output            ddr3_cas_n,
  inout   [  7:0]   ddr3_dqs_p,
  inout   [  7:0]   ddr3_dqs_n,
  inout   [ 63:0]   ddr3_dq,
  output  [  7:0]   ddr3_dm,
  input             ddr3_rzq,

  // ethernet

  input             eth_rx_clk,
  input   [  3:0]   eth_rx_data,
  input             eth_rx_cntrl,
  output            eth_tx_clk_out,
  output  [  3:0]   eth_tx_data,
  output            eth_tx_cntrl,
  output            eth_mdc,
  input             eth_mdio_i,
  output            eth_mdio_o,
  output            eth_mdio_t,
  output            eth_phy_resetn,

  // board gpio

  output  [ 15:0]   gpio_bd_o,
  input   [ 10:0]   gpio_bd_i,

  // lane interface

  input             ref_clk,
  input   [  3:0]   rx_data,
  output            rx_sync,
  output            rx_sysref,

  // spi

  output            spi_csn,
  output            spi_clk,
  inout             spi_sdio);

  // internal registers

  reg     [  3:0]   phy_rst_cnt = 0;
  reg               phy_rst_reg = 0;

  // internal signals

  wire              sys_125m_clk;
  wire              sys_25m_clk;
  wire              sys_2m5_clk;
  wire              sys_cpu_clk;
  wire              sys_cpu_mem_resetn;
  wire              sys_cpu_resetn;
  wire              sys_pll_locked;
  wire              eth_tx_clk;
  wire              eth_tx_mode_1g;
  wire              eth_tx_mode_10m_100m_n;
  wire              rx_clk;
  wire    [  3:0]   rx_ip_sof;
  wire    [127:0]   rx_ip_data;
  wire              spi_mosi;
  wire              spi_miso;
  wire    [ 63:0]   gpio_i;
  wire    [ 63:0]   gpio_o;
  wire    [  7:0]   spi_csn_s;

  // sys reset

  assign sys_cpu_resetn = sys_resetn & sys_cpu_mem_resetn & sys_pll_locked;

  // ethernet transmit clock

  assign eth_tx_clk = (eth_tx_mode_1g == 1'b1) ? sys_125m_clk :
    (eth_tx_mode_10m_100m_n == 1'b0) ? sys_25m_clk : sys_2m5_clk;

  assign eth_phy_resetn = phy_rst_reg;

  always@ (posedge eth_mdc) begin
    phy_rst_cnt <= phy_rst_cnt + 4'd1;
    if (phy_rst_cnt == 4'h0) begin
      phy_rst_reg <= sys_pll_locked;
    end
  end

  // gpio

  assign gpio_i[63:11] = gpio_o[63:11];
  assign gpio_i[10: 0] = gpio_bd_i;

  assign gpio_bd_o = gpio_o[26:11];

  // sysref

  ad_sysref_gen #(.SYSREF_PERIOD(64)) i_sysref (
    .core_clk (rx_clk),
    .sysref_en (gpio_o[32]),
    .sysref_out (rx_sysref));

 // instantiations

  assign spi_csn = spi_csn_s[0];

  fmcjesdadc1_spi i_fmcjesdadc1_spi (
    .spi_csn (spi_csn_s[0]),
    .spi_clk (spi_clk),
    .spi_mosi (spi_mosi),
    .spi_miso (spi_miso),
    .spi_sdio (spi_sdio));

  altddio_out #(.width(1)) i_eth_tx_clk_out (
    .aset (1'b0),
    .sset (1'b0),
    .sclr (1'b0),
    .oe (1'b1),
    .oe_out (),
    .datain_h (1'b1),
    .datain_l (1'b0),
    .outclocken (1'b1),
    .aclr (~sys_pll_locked),
    .outclock (eth_tx_clk),
    .dataout (eth_tx_clk_out));

  system_bd i_system_bd (
    .rx_core_clk_clk (rx_clk),
    .rx_data_0_rx_serial_data (rx_data[0]),
    .rx_data_1_rx_serial_data (rx_data[1]),
    .rx_data_2_rx_serial_data (rx_data[2]),
    .rx_data_3_rx_serial_data (rx_data[3]),
    .rx_ip_data_data (rx_ip_data),
    .rx_ip_data_valid (),
    .rx_ip_data_ready (1'b1),
    .rx_ip_data_0_data (rx_ip_data[63:0]),
    .rx_ip_data_0_valid (1'b1),
    .rx_ip_data_0_ready (),
    .rx_ip_data_1_data (rx_ip_data[127:64]),
    .rx_ip_data_1_valid (1'b1),
    .rx_ip_data_1_ready (),
    .rx_ip_sof_export (rx_ip_sof),
    .rx_ip_sof_0_export (rx_ip_sof),
    .rx_ip_sof_1_export (rx_ip_sof),
    .rx_ref_clk_clk (ref_clk),
    .rx_sync_export (rx_sync),
    .rx_sysref_export (rx_sysref),
    .sys_125m_clk_clk (sys_125m_clk),
    .sys_25m_clk_clk (sys_25m_clk),
    .sys_2m5_clk_clk (sys_2m5_clk),
    .sys_clk_clk (sys_cpu_clk),
    .sys_cpu_clk_clk (sys_cpu_clk),
    .sys_cpu_reset_reset_n (sys_cpu_mem_resetn),
    .sys_ddr3_cntrl_mem_mem_a (ddr3_a),
    .sys_ddr3_cntrl_mem_mem_ba (ddr3_ba),
    .sys_ddr3_cntrl_mem_mem_ck (ddr3_clk_p),
    .sys_ddr3_cntrl_mem_mem_ck_n (ddr3_clk_n),
    .sys_ddr3_cntrl_mem_mem_cke (ddr3_cke),
    .sys_ddr3_cntrl_mem_mem_cs_n (ddr3_cs_n),
    .sys_ddr3_cntrl_mem_mem_dm (ddr3_dm),
    .sys_ddr3_cntrl_mem_mem_ras_n (ddr3_ras_n),
    .sys_ddr3_cntrl_mem_mem_cas_n (ddr3_cas_n),
    .sys_ddr3_cntrl_mem_mem_we_n (ddr3_we_n),
    .sys_ddr3_cntrl_mem_mem_reset_n (ddr3_reset_n),
    .sys_ddr3_cntrl_mem_mem_dq (ddr3_dq),
    .sys_ddr3_cntrl_mem_mem_dqs (ddr3_dqs_p),
    .sys_ddr3_cntrl_mem_mem_dqs_n (ddr3_dqs_n),
    .sys_ddr3_cntrl_mem_mem_odt (ddr3_odt),
    .sys_ddr3_cntrl_oct_rzqin (ddr3_rzq),
    .sys_ethernet_mdio_mdc (eth_mdc),
    .sys_ethernet_mdio_mdio_in (eth_mdio_i),
    .sys_ethernet_mdio_mdio_out (eth_mdio_o),
    .sys_ethernet_mdio_mdio_oen (eth_mdio_t),
    .sys_ethernet_rgmii_rgmii_in (eth_rx_data),
    .sys_ethernet_rgmii_rgmii_out (eth_tx_data),
    .sys_ethernet_rgmii_rx_control (eth_rx_cntrl),
    .sys_ethernet_rgmii_tx_control (eth_tx_cntrl),
    .sys_ethernet_rx_clk_clk (eth_rx_clk),
    .sys_ethernet_status_set_10 (),
    .sys_ethernet_status_set_1000 (),
    .sys_ethernet_status_eth_mode (eth_tx_mode_1g),
    .sys_ethernet_status_ena_10 (eth_tx_mode_10m_100m_n),
    .sys_ethernet_tx_clk_clk (eth_tx_clk),
    .sys_gpio_bd_in_port (gpio_i[31:0]),
    .sys_gpio_bd_out_port (gpio_o[31:0]),
    .sys_gpio_in_export (gpio_i[63:32]),
    .sys_gpio_out_export (gpio_o[63:32]),
    .sys_pll_locked_export (sys_pll_locked),
    .sys_ref_clk_clk (sys_clk),
    .sys_ref_rst_reset_n (sys_resetn),
    .sys_rst_reset_n (sys_cpu_resetn),
    .sys_spi_MISO (spi_miso),
    .sys_spi_MOSI (spi_mosi),
    .sys_spi_SCLK (spi_clk),
    .sys_spi_SS_n (spi_csn_s));

endmodule

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