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diff --git a/fpga/usrp3/lib/control/bin2gray.v b/fpga/usrp3/lib/control/bin2gray.v
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+++ b/fpga/usrp3/lib/control/bin2gray.v
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+//
+// Copyright 2011 Ettus Research LLC
+// Copyright 2018 Ettus Research, a National Instruments Company
+//
+// SPDX-License-Identifier: LGPL-3.0-or-later
+//
+// This program 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.
+//
+// This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+
+
+module bin2gray
+  #(parameter WIDTH=8)
+    (input [WIDTH-1:0] bin,
+     output [WIDTH-1:0] gray);
+
+   assign 		gray = (bin >> 1) ^ bin;
+   
+endmodule // bin2gray