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diff --git a/usrp2/fpga/control_lib/mux4.v b/usrp2/fpga/control_lib/mux4.v
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+
+
+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