// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) 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 1ps/1ps

module ad_mul #(

  parameter   A_DATA_WIDTH = 17,
  parameter   B_DATA_WIDTH = 17,
  parameter   DELAY_DATA_WIDTH = 16
) (

  // data_p = data_a * data_b;

  input                                     clk,
  input   [               A_DATA_WIDTH-1:0] data_a,
  input   [               B_DATA_WIDTH-1:0] data_b,
  output  [A_DATA_WIDTH + B_DATA_WIDTH-1:0] data_p,

  // delay interface

  input       [(DELAY_DATA_WIDTH-1):0]  ddata_in,
  output  reg [(DELAY_DATA_WIDTH-1):0]  ddata_out
);

  // internal registers

  reg     [(DELAY_DATA_WIDTH-1):0]    p1_ddata = 'd0;
  reg     [(DELAY_DATA_WIDTH-1):0]    p2_ddata = 'd0;

  // a/b reg, m-reg, p-reg delay match

  always @(posedge clk) begin
    p1_ddata <= ddata_in;
    p2_ddata <= p1_ddata;
    ddata_out <= p2_ddata;
  end

  lpm_mult #(
    .lpm_type ("lpm_mult"),
    .lpm_widtha (A_DATA_WIDTH),
    .lpm_widthb (B_DATA_WIDTH),
    .lpm_widthp (A_DATA_WIDTH + B_DATA_WIDTH),
    .lpm_representation ("SIGNED"),
    .lpm_pipeline (3))
  i_lpm_mult (
    .clken (1'b1),
    .aclr (1'b0),
    .sclr (1'b0),
    .sum (1'b0),
    .clock (clk),
    .dataa (data_a),
    .datab (data_b),
    .result (data_p));

endmodule