// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
//
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// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// ***************************************************************************
// This is the LVDS/DDR interface

`timescale 1ns/100ps

module axi_ad9467_if (

  // adc interface (clk, data, over-range)

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

  // interface outputs

  adc_clk,
  adc_data,
  adc_or,

  // processor interface

  adc_ddr_edgesel,

  // delay control signals

  up_clk,
  up_dld,
  up_dwdata,
  up_drdata,
  delay_clk,
  delay_rst,
  delay_locked);

  // buffer type based on the target device.

  parameter DEVICE_TYPE = 0;
  parameter IO_DELAY_GROUP = "dev_if_delay_group";

  // adc interface (clk, data, over-range)

  input           adc_clk_in_p;
  input           adc_clk_in_n;
  input   [ 7:0]  adc_data_in_p;
  input   [ 7:0]  adc_data_in_n;
  input           adc_or_in_p;
  input           adc_or_in_n;

  // interface outputs

  output          adc_clk;
  output  [15:0]  adc_data;
  output          adc_or;

  // processor interface

  input           adc_ddr_edgesel;

  // delay control signals

  input           up_clk;
  input   [ 8:0]  up_dld;
  input   [44:0]  up_dwdata;
  output  [44:0]  up_drdata;
  input           delay_clk;
  input           delay_rst;
  output          delay_locked;

  // internal registers

  reg     [ 7:0]  adc_data_p = 'd0;
  reg     [ 7:0]  adc_data_n = 'd0;
  reg     [ 7:0]  adc_data_p_d = 'd0;
  reg     [ 7:0]  adc_dmux_a = 'd0;
  reg     [ 7:0]  adc_dmux_b = 'd0;
  reg     [15:0]  adc_data = 'd0;
  reg             adc_or_p = 'd0;
  reg             adc_or_n = 'd0;
  reg             adc_or = 'd0;

  // internal signals

  wire    [ 7:0]  adc_data_p_s;
  wire    [ 7:0]  adc_data_n_s;
  wire            adc_or_p_s;
  wire            adc_or_n_s;

  genvar          l_inst;

  // sample select (p/n) swap

  always @(posedge adc_clk) begin
    adc_data_p <= adc_data_p_s;
    adc_data_n <= adc_data_n_s;
    adc_data_p_d <= adc_data_p;
    adc_dmux_a <= (adc_ddr_edgesel == 1'b1) ? adc_data_n   : adc_data_p;
    adc_dmux_b <= (adc_ddr_edgesel == 1'b1) ? adc_data_p_d : adc_data_n;
    adc_data[15] <= adc_dmux_b[7];
    adc_data[14] <= adc_dmux_a[7];
    adc_data[13] <= adc_dmux_b[6];
    adc_data[12] <= adc_dmux_a[6];
    adc_data[11] <= adc_dmux_b[5];
    adc_data[10] <= adc_dmux_a[5];
    adc_data[ 9] <= adc_dmux_b[4];
    adc_data[ 8] <= adc_dmux_a[4];
    adc_data[ 7] <= adc_dmux_b[3];
    adc_data[ 6] <= adc_dmux_a[3];
    adc_data[ 5] <= adc_dmux_b[2];
    adc_data[ 4] <= adc_dmux_a[2];
    adc_data[ 3] <= adc_dmux_b[1];
    adc_data[ 2] <= adc_dmux_a[1];
    adc_data[ 1] <= adc_dmux_b[0];
    adc_data[ 0] <= adc_dmux_a[0];
    adc_or_p <= adc_or_p_s;
    adc_or_n <= adc_or_n_s;
    if ((adc_or_p == 1'b1) || (adc_or_n == 1'b1)) begin
      adc_or <= 1'b1;
    end else begin
      adc_or <= 1'b0;
    end
  end

  // data interface

  generate
  for (l_inst = 0; l_inst <= 7; l_inst = l_inst + 1) begin : g_adc_if
  ad_lvds_in #(
    .DEVICE_TYPE (DEVICE_TYPE),
    .IODELAY_CTRL (0),
    .IODELAY_GROUP (IO_DELAY_GROUP))
  i_adc_data (
    .rx_clk (adc_clk),
    .rx_data_in_p (adc_data_in_p[l_inst]),
    .rx_data_in_n (adc_data_in_n[l_inst]),
    .rx_data_p (adc_data_p_s[l_inst]),
    .rx_data_n (adc_data_n_s[l_inst]),
    .up_clk (up_clk),
    .up_dld (up_dld[l_inst]),
    .up_dwdata (up_dwdata[((l_inst*5)+4):(l_inst*5)]),
    .up_drdata (up_drdata[((l_inst*5)+4):(l_inst*5)]),
    .delay_clk (delay_clk),
    .delay_rst (delay_rst),
    .delay_locked ());
  end
  endgenerate

  // over-range interface

  ad_lvds_in #(
    .DEVICE_TYPE (DEVICE_TYPE),
    .IODELAY_CTRL (1),
    .IODELAY_GROUP (IO_DELAY_GROUP))
  i_adc_or (
    .rx_clk (adc_clk),
    .rx_data_in_p (adc_or_in_p),
    .rx_data_in_n (adc_or_in_n),
    .rx_data_p (adc_or_p_s),
    .rx_data_n (adc_or_n_s),
    .up_clk (up_clk),
    .up_dld (up_dld[8]),
    .up_dwdata (up_dwdata[44:40]),
    .up_drdata (up_drdata[44:40]),
    .delay_clk (delay_clk),
    .delay_rst (delay_rst),
    .delay_locked (delay_locked));

  // clock

  ad_lvds_clk #(
    .DEVICE_TYPE (DEVICE_TYPE))
  i_adc_clk (
    .rst (1'b0),
    .locked (),
    .clk_in_p (adc_clk_in_p),
    .clk_in_n (adc_clk_in_n),
    .clk (adc_clk));

endmodule

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