// ***************************************************************************
// ***************************************************************************
// 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.
//
// ***************************************************************************
// ***************************************************************************
// Color Space Conversion, multiplier. This is a simple partial product adder
// that generates the product of the two inputs.

`timescale 1ps/1ps

module ad_csc_1_mul #(

  parameter   DELAY_DATA_WIDTH = 16) (

  // data_a is signed

  input                             clk,
  input   [16:0]                    data_a,
  input   [ 7:0]                    data_b,
  output  [24:0]                    data_p,

  // delay match

  input   [(DELAY_DATA_WIDTH-1):0]  ddata_in,
  output  [(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;
  reg     [(DELAY_DATA_WIDTH-1):0]  p3_ddata = 'd0;
  reg                               p1_sign = 'd0;
  reg                               p2_sign = 'd0;
  reg                               p3_sign = 'd0;

  // internal signals

  wire    [33:0]                    p3_data_s;

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

  always @(posedge clk) begin
    p1_ddata <= ddata_in;
    p2_ddata <= p1_ddata;
    p3_ddata <= p2_ddata;
  end

  always @(posedge clk) begin
    p1_sign <= data_a[16];
    p2_sign <= p1_sign;
    p3_sign <= p2_sign;
  end

  assign ddata_out = p3_ddata;
  assign data_p = {p3_sign, p3_data_s[23:0]};

  ad_mul ad_mul_1 (
  .clk(clk),
  .data_a({1'b0, data_a[15:0]}),
  .data_b({9'b0, data_b}),
  .data_p(p3_data_s),
  .ddata_in(16'h0),
  .ddata_out());

endmodule

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