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diff --git a/fpga/usrp2/control_lib/mux4.v b/fpga/usrp2/control_lib/mux4.v
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+++ b/fpga/usrp2/control_lib/mux4.v
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+//
+// Copyright 2011 Ettus Research LLC
+//
+// 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 mux4
+  #(parameter WIDTH=32, parameter DISABLED=0)
+    (input en,
+     input [1:0] sel,
+     input [WIDTH-1:0] i0,
+     input [WIDTH-1:0] i1,
+     input [WIDTH-1:0] i2,
+     input [WIDTH-1:0] i3,
+     output [WIDTH-1:0] o);
+
+   assign 		o = en ? (sel[1] ? (sel[0] ? i3 : i2) : (sel[0] ? i1 : i0)) :
+			DISABLED;
+   
+endmodule // mux4