// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// Each core or library found in this collection may have its own licensing terms. 
// The user should keep this in in mind while exploring these cores. 
//
// Redistribution and use in source and binary forms,
// with or without modification of this file, are permitted under the terms of either
//  (at the option of the user):
//
//   1. The GNU General Public License version 2 as published by the
//      Free Software Foundation, which can be found in the top level directory, or at:
// https://www.gnu.org/licenses/old-licenses/gpl-2.0.en.html
//
// OR
//
//   2.  An ADI specific BSD license as noted in the top level directory, or on-line at:
// https://github.com/analogdevicesinc/hdl/blob/dev/LICENSE
//
// ***************************************************************************
// ***************************************************************************
// Transmit HDMI, CrYCb to RGB conversion
// The multiplication coefficients are in 1.4.12 format
// The addition coefficients are in 1.12.12 format
// R = (+408.583/256)*Cr + (+298.082/256)*Y + ( 000.000/256)*Cb + (-222.921);
// G = (-208.120/256)*Cr + (+298.082/256)*Y + (-100.291/256)*Cb + (+135.576);
// B = ( 000.000/256)*Cr + (+298.082/256)*Y + (+516.412/256)*Cb + (-276.836);

module ad_csc_CrYCb2RGB #(

  parameter   DELAY_DATA_WIDTH = 16) (

  // Cr-Y-Cb inputs

  input                   clk,
  input       [DW:0]      CrYCb_sync,
  input       [23:0]      CrYCb_data,

  // R-G-B outputs

  output      [DW:0]      RGB_sync,
  output      [23:0]      RGB_data);

  localparam  DW = DELAY_DATA_WIDTH - 1;

  // red

  ad_csc_1 #(.DELAY_DATA_WIDTH(DELAY_DATA_WIDTH)) i_csc_1_R (
    .clk (clk),
    .sync (CrYCb_sync),
    .data (CrYCb_data),
    .C1 (17'h01989),
    .C2 (17'h012a1),
    .C3 (17'h00000),
    .C4 (25'h10deebc),
    .csc_sync_1 (RGB_sync),
    .csc_data_1 (RGB_data[23:16]));

  // green

  ad_csc_1 #(.DELAY_DATA_WIDTH(1)) i_csc_1_G (
    .clk (clk),
    .sync (1'd0),
    .data (CrYCb_data),
    .C1 (17'h10d01),
    .C2 (17'h012a1),
    .C3 (17'h10644),
    .C4 (25'h0087937),
    .csc_sync_1 (),
    .csc_data_1 (RGB_data[15:8]));

  // blue

  ad_csc_1 #(.DELAY_DATA_WIDTH(1)) i_csc_1_B (
    .clk (clk),
    .sync (1'd0),
    .data (CrYCb_data),
    .C1 (17'h00000),
    .C2 (17'h012a1),
    .C3 (17'h02046),
    .C4 (25'h1114d60),
    .csc_sync_1 (),
    .csc_data_1 (RGB_data[7:0]));

endmodule

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