// ***************************************************************************
// ***************************************************************************
// Copyright 2011(c) Analog Devices, Inc.
// 
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// ***************************************************************************
// ***************************************************************************

`timescale 1ns/100ps

module ad_jesd_align (

  // jesd interface

  rx_clk,
  rx_ip_sof,
  rx_ip_data,
  rx_sof,
  rx_data);

  // jesd interface

  input           rx_clk;
  input   [ 3:0]  rx_ip_sof;
  input   [31:0]  rx_ip_data;

  // aligned data

  output          rx_sof;
  output  [31:0]  rx_data;

  // internal registers

  reg     [31:0]  rx_ip_data_d = 'd0;
  reg     [ 3:0]  rx_ip_sof_hold = 'd0;
  reg             rx_sof = 'd0;
  reg             rx_ip_sof_d = 'd0;
  reg     [31:0]  rx_data = 'd0;

  // dword may contain more than one frame per clock

  always @(posedge rx_clk) begin
    rx_ip_data_d <= rx_ip_data;
    rx_ip_sof_d <= rx_ip_sof;
    if (rx_ip_sof != 4'h0) begin
      rx_ip_sof_hold <= rx_ip_sof;
    end
    rx_sof <= |rx_ip_sof_d;
    if (rx_ip_sof_hold[0] == 1'b1) begin
      rx_data <= rx_ip_data;
    end else if (rx_ip_sof_hold[1] == 1'b1) begin
      rx_data <= {rx_ip_data[ 7:0], rx_ip_data_d[31: 8]};
    end else if (rx_ip_sof_hold[2] == 1'b1) begin
      rx_data <= {rx_ip_data[15:0], rx_ip_data_d[31:16]};
    end else if (rx_ip_sof_hold[3] == 1'b1) begin
      rx_data <= {rx_ip_data[23:0], rx_ip_data_d[31:24]};
    end else begin
      rx_data <= 32'd0;
    end
  end

endmodule

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