pluto_hdl_adi/library/common/ad_csc_RGB2CrYCb.v

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// ***************************************************************************
// ***************************************************************************
// Copyright 2014 - 2017 (c) Analog Devices, Inc. All rights reserved.
//
// 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
// the repository (LICENSE_GPL2), and at: <https://www.gnu.org/licenses/old-licenses/gpl-2.0.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/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.
//
// ***************************************************************************
// ***************************************************************************
// Transmit HDMI, RGB to CrYCb conversion
// The multiplication coefficients are in 1.4.12 format
// The addition coefficients are in 1.12.12 format
// Cr = (+112.439/256)*R + (-094.154/256)*G + (-018.285/256)*B + 128;
// Y = (+065.738/256)*R + (+129.057/256)*G + (+025.064/256)*B + 16;
// Cb = (-037.945/256)*R + (-074.494/256)*G + (+112.439/256)*B + 128;
module ad_csc_RGB2CrYCb #(
parameter DELAY_DATA_WIDTH = 16) (
// R-G-B inputs
input clk,
input [DW:0] RGB_sync,
input [23:0] RGB_data,
// Cr-Y-Cb outputs
output [DW:0] CrYCb_sync,
output [23:0] CrYCb_data);
localparam DW = DELAY_DATA_WIDTH - 1;
// Cr (red-diff)
ad_csc_1 #(.DELAY_DATA_WIDTH(DELAY_DATA_WIDTH)) i_csc_1_Cr (
.clk (clk),
.sync (RGB_sync),
.data (RGB_data),
.C1 (17'h00707),
.C2 (17'h105e2),
.C3 (17'h10124),
.C4 (25'h0080000),
.csc_sync_1 (CrYCb_sync),
.csc_data_1 (CrYCb_data[23:16]));
// Y (luma)
ad_csc_1 #(.DELAY_DATA_WIDTH(1)) i_csc_1_Y (
.clk (clk),
.sync (1'd0),
.data (RGB_data),
.C1 (17'h0041b),
.C2 (17'h00810),
.C3 (17'h00191),
.C4 (25'h0010000),
.csc_sync_1 (),
.csc_data_1 (CrYCb_data[15:8]));
// Cb (blue-diff)
ad_csc_1 #(.DELAY_DATA_WIDTH(1)) i_csc_1_Cb (
.clk (clk),
.sync (1'd0),
.data (RGB_data),
.C1 (17'h1025f),
.C2 (17'h104a7),
.C3 (17'h00707),
.C4 (25'h0080000),
.csc_sync_1 (),
.csc_data_1 (CrYCb_data[7:0]));
endmodule
// ***************************************************************************
// ***************************************************************************