// ***************************************************************************
// ***************************************************************************
// Copyright (C) 2015-2023 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/main/LICENSE_ADIBSD
//      This will allow to generate bit files and not release the source code,
//      as long as it attaches to an ADI device.
//
// ***************************************************************************
// ***************************************************************************
// This is the dac physical interface (drives samples from the low speed clock to the
// dac clock domain.

`timescale 1ns/100ps

module axi_ad9739a_if #(

  parameter   FPGA_TECHNOLOGY = 0
) (

  // dac interface

  input                   dac_clk_in_p,
  input                   dac_clk_in_n,
  output                  dac_clk_out_p,
  output                  dac_clk_out_n,
  output      [13:0]      dac_data_out_a_p,
  output      [13:0]      dac_data_out_a_n,
  output      [13:0]      dac_data_out_b_p,
  output      [13:0]      dac_data_out_b_n,

  // internal resets and clocks

  input                   dac_rst,
  output                  dac_clk,
  output                  dac_div_clk,
  output  reg             dac_status,

  // data interface

  input       [15:0]      dac_data_00,
  input       [15:0]      dac_data_01,
  input       [15:0]      dac_data_02,
  input       [15:0]      dac_data_03,
  input       [15:0]      dac_data_04,
  input       [15:0]      dac_data_05,
  input       [15:0]      dac_data_06,
  input       [15:0]      dac_data_07,
  input       [15:0]      dac_data_08,
  input       [15:0]      dac_data_09,
  input       [15:0]      dac_data_10,
  input       [15:0]      dac_data_11,
  input       [15:0]      dac_data_12,
  input       [15:0]      dac_data_13,
  input       [15:0]      dac_data_14,
  input       [15:0]      dac_data_15
);

  // internal registers

  // internal signals

  wire            dac_clk_in_s;
  wire            dac_div_clk_s;

  // dac status

  always @(posedge dac_div_clk) begin
    if (dac_rst == 1'b1) begin
      dac_status <= 1'd0;
    end else begin
      dac_status <= 1'd1;
    end
  end

  // dac data output serdes(s) & buffers

  ad_serdes_out #(
    .DDR_OR_SDR_N(1),
    .DATA_WIDTH(14),
    .SERDES_FACTOR(8),
    .FPGA_TECHNOLOGY (FPGA_TECHNOLOGY)
  ) i_serdes_out_data_a (
    .rst (dac_rst),
    .clk (dac_clk),
    .div_clk (dac_div_clk),
    .data_oe (1'b1),
    .data_s0 (dac_data_00[15:2]),
    .data_s1 (dac_data_02[15:2]),
    .data_s2 (dac_data_04[15:2]),
    .data_s3 (dac_data_06[15:2]),
    .data_s4 (dac_data_08[15:2]),
    .data_s5 (dac_data_10[15:2]),
    .data_s6 (dac_data_12[15:2]),
    .data_s7 (dac_data_14[15:2]),
    .data_out_se (),
    .data_out_p (dac_data_out_a_p),
    .data_out_n (dac_data_out_a_n));

  // dac data output serdes(s) & buffers

  ad_serdes_out #(
    .DDR_OR_SDR_N(1),
    .DATA_WIDTH(14),
    .SERDES_FACTOR(8),
    .FPGA_TECHNOLOGY (FPGA_TECHNOLOGY)
  ) i_serdes_out_data_b (
    .rst (dac_rst),
    .clk (dac_clk),
    .div_clk (dac_div_clk),
    .data_oe (1'b1),
    .data_s0 (dac_data_01[15:2]),
    .data_s1 (dac_data_03[15:2]),
    .data_s2 (dac_data_05[15:2]),
    .data_s3 (dac_data_07[15:2]),
    .data_s4 (dac_data_09[15:2]),
    .data_s5 (dac_data_11[15:2]),
    .data_s6 (dac_data_13[15:2]),
    .data_s7 (dac_data_15[15:2]),
    .data_out_se (),
    .data_out_p (dac_data_out_b_p),
    .data_out_n (dac_data_out_b_n));

  // dac clock output serdes & buffer

  ad_serdes_out #(
    .DDR_OR_SDR_N(1),
    .DATA_WIDTH(1),
    .SERDES_FACTOR(8),
    .FPGA_TECHNOLOGY (FPGA_TECHNOLOGY)
  ) i_serdes_out_clk (
    .rst (dac_rst),
    .clk (dac_clk),
    .div_clk (dac_div_clk),
    .data_oe (1'b1),
    .data_s0 (1'b1),
    .data_s1 (1'b0),
    .data_s2 (1'b1),
    .data_s3 (1'b0),
    .data_s4 (1'b1),
    .data_s5 (1'b0),
    .data_s6 (1'b1),
    .data_s7 (1'b0),
    .data_out_se (),
    .data_out_p (dac_clk_out_p),
    .data_out_n (dac_clk_out_n));

  // dac clock input buffers

  IBUFGDS i_dac_clk_in_ibuf (
    .I (dac_clk_in_p),
    .IB (dac_clk_in_n),
    .O (dac_clk_in_s));

  BUFG i_dac_clk_in_gbuf (
    .I (dac_clk_in_s),
    .O (dac_clk));

  BUFR #(
    .BUFR_DIVIDE("4")
  ) i_dac_div_clk_rbuf (
    .CLR (1'b0),
    .CE (1'b1),
    .I (dac_clk_in_s),
    .O (dac_div_clk_s));

  BUFG i_dac_div_clk_gbuf (
    .I (dac_div_clk_s),
    .O (dac_div_clk));

endmodule