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diff --git a/usrp2/models/IBUFGDS.v b/usrp2/models/IBUFGDS.v
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+// $Header: /devl/xcs/repo/env/Databases/CAEInterfaces/verunilibs/data/unisims/IBUFGDS.v,v 1.8 2007/07/26 23:22:55 fphillip Exp $
+///////////////////////////////////////////////////////////////////////////////
+// Copyright (c) 1995/2004 Xilinx, Inc.
+// All Right Reserved.
+///////////////////////////////////////////////////////////////////////////////
+//   ____  ____
+//  /   /\/   /
+// /___/  \  /    Vendor : Xilinx
+// \   \   \/     Version : 10.1
+//  \   \         Description : Xilinx Functional Simulation Library Component
+//  /   /                  Differential Signaling Input Clock Buffer
+// /___/   /\     Filename : IBUFGDS.v
+// \   \  /  \    Timestamp : Thu Mar 25 16:42:24 PST 2004
+//  \___\/\___\
+//
+// Revision:
+//    03/23/04 - Initial version.
+//    05/23/07 - Changed timescale to 1 ps / 1 ps.
+//    07/26/07 - Add else to handle x case for o_out (CR 424214).
+// End Revision
+
+
+`timescale  1 ps / 1 ps
+
+
+module IBUFGDS (O, I, IB);
+
+    parameter CAPACITANCE = "DONT_CARE";   
+    parameter DIFF_TERM = "FALSE";
+    parameter IBUF_DELAY_VALUE = "0";
+    parameter IOSTANDARD = "DEFAULT";
+   
+    output O;
+    input  I, IB;
+
+    reg o_out;
+
+    buf b_0 (O, o_out);
+
+    initial begin
+	
+        case (CAPACITANCE)
+
+            "LOW", "NORMAL", "DONT_CARE" : ;
+            default : begin
+                          $display("Attribute Syntax Error : The attribute CAPACITANCE on IBUFGDS instance %m is set to %s.  Legal values for this attribute are DONT_CARE, LOW or NORMAL.", CAPACITANCE);
+                          $finish;
+                      end
+
+        endcase
+
+	
+	case (DIFF_TERM)
+
+            "TRUE", "FALSE" : ;
+            default : begin
+                          $display("Attribute Syntax Error : The attribute DIFF_TERM on IBUFGDS instance %m is set to %s.  Legal values for this attribute are TRUE or FALSE.", DIFF_TERM);
+                          $finish;
+                      end
+
+	endcase
+
+	
+	case (IBUF_DELAY_VALUE)
+
+            "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "10", "11", "12", "13", "14", "15", "16" : ;
+            default : begin
+                          $display("Attribute Syntax Error : The attribute IBUF_DELAY_VALUE on IBUFGDS instance %m is set to %s.  Legal values for this attribute are 0, 1, 2, ... or 16.", IBUF_DELAY_VALUE);
+                          $finish;
+                      end
+
+        endcase
+	
+    end
+    
+    always @(I or IB) begin
+	if (I == 1'b1 && IB == 1'b0)
+	    o_out <= I;
+	else if (I == 1'b0 && IB == 1'b1)
+	    o_out <= I;
+        else if (I == 1'bx && IB == 1'bx)
+            o_out <= 1'bx;
+    end
+
+endmodule
+
+