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diff --git a/usrp1/megacells/addsub16_bb.v b/usrp1/megacells/addsub16_bb.v
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+//Copyright (C) 1991-2003 Altera Corporation
+//Any  megafunction  design,  and related netlist (encrypted  or  decrypted),
+//support information,  device programming or simulation file,  and any other
+//associated  documentation or information  provided by  Altera  or a partner
+//under  Altera's   Megafunction   Partnership   Program  may  be  used  only
+//to program  PLD  devices (but not masked  PLD  devices) from  Altera.   Any
+//other  use  of such  megafunction  design,  netlist,  support  information,
+//device programming or simulation file,  or any other  related documentation
+//or information  is prohibited  for  any  other purpose,  including, but not
+//limited to  modification,  reverse engineering,  de-compiling, or use  with
+//any other  silicon devices,  unless such use is  explicitly  licensed under
+//a separate agreement with  Altera  or a megafunction partner.  Title to the
+//intellectual property,  including patents,  copyrights,  trademarks,  trade
+//secrets,  or maskworks,  embodied in any such megafunction design, netlist,
+//support  information,  device programming or simulation file,  or any other
+//related documentation or information provided by  Altera  or a megafunction
+//partner, remains with Altera, the megafunction partner, or their respective
+//licensors. No other licenses, including any licenses needed under any third
+//party's intellectual property, are provided herein.
+
+module addsub16 (
+	add_sub,
+	dataa,
+	datab,
+	clock,
+	aclr,
+	clken,
+	result)/* synthesis synthesis_clearbox = 1 */;
+
+	input	  add_sub;
+	input	[15:0]  dataa;
+	input	[15:0]  datab;
+	input	  clock;
+	input	  aclr;
+	input	  clken;
+	output	[15:0]  result;
+
+endmodule
+