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diff --git a/fpga/usrp1/tb/justinterp_tb.v b/fpga/usrp1/tb/justinterp_tb.v
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+++ b/fpga/usrp1/tb/justinterp_tb.v
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+// -*- verilog -*-
+//
+//  USRP - Universal Software Radio Peripheral
+//
+//  Copyright (C) 2003 Matt Ettus
+//
+//  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 2 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, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Boston, MA  02110-1301  USA
+//
+
+
+module cic_decim_tb;
+
+cic_decim #(.bitwidth(16),.stages(4))
+   decim(clock,reset,enable,strobe_in,strobe_out,signal_in,signal_out);
+	
+   reg clock;
+   reg reset;
+   reg enable;
+   wire strobe;
+   reg [15:0] signal_in;
+   wire [15:0] signal_out;
+
+   assign      strobe_in = 1'b1;
+   reg 	       strobe_out;
+
+   always @(posedge clock)
+     while(1)
+       begin
+	  @(posedge clock);
+	  @(posedge clock);
+	  @(posedge clock);
+	  @(posedge clock);
+	  strobe_out <= 1'b1;
+	  @(posedge clock);
+	  @(posedge clock);
+	  @(posedge clock);
+	  @(posedge clock);
+	  strobe_out <= 1'b0;
+       end
+   
+   initial clock = 0;
+   always #50 clock = ~clock;
+   
+   initial reset = 1;
+   initial #1000 reset = 0;
+
+   initial enable = 0;
+   initial #2000 enable = 1;
+   
+   initial signal_in = 16'h1;
+   initial #500000 signal_in = 16'h7fff;
+   initial #1000000 signal_in = 16'h8000;
+   initial #1500000 signal_in = 16'hffff;
+
+   
+   initial $dumpfile("decim.vcd");
+   initial $dumpvars(0,cic_decim_tb);
+
+   initial #10000000 $finish;
+   
+endmodule // cic_decim_tb