Update sys. Re-organize the sources.

rtl/sound/jt12/jt12_limitamp.v

@@ -0,0 +1,42 @@
+/*  This file is part of JT12.
+
+    JT12 is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    JT12 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.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with JT12.  If not, see <http://www.gnu.org/licenses/>.
+
+	Author: Jose Tejada Gomez. Twitter: @topapate
+	Version: 1.0
+	Date: March, 10th 2017
+	*/
+
+/* Limiting amplifier by 3dB * shift */
+
+`timescale 1ns / 1ps
+
+module jt12_limitamp #( parameter width=20, shift=5 ) (
+	input signed [width-1:0] left_in,
+	input signed [width-1:0] right_in,
+	output reg signed [width-1:0] left_out,
+	output reg signed [width-1:0] right_out
+);
+
+always @(*) begin
+	left_out <= ^left_in[width-1:width-1-shift] ?
+		{ left_in[width-1], {(width-1){~left_in[width-1]}}} :
+		left_in <<< shift;
+
+	right_out <= ^right_in[width-1:width-1-shift] ?
+		{ right_in[width-1], {(width-1){~right_in[width-1]}}} :
+		right_in <<< shift;
+end
+
+endmodule