1 files changed, 108 insertions, 0 deletions
diff --git a/fpga/usrp1/tb/decim_tb.v b/fpga/usrp1/tb/decim_tb.v
new file mode 100644
index 000000000..d9a926125
--- /dev/null
+++ b/fpga/usrp1/tb/decim_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
+//
+
+
+// testbench for fullchip
+
+module decim_tb();
+
+`include "usrp_tasks.v"
+   
+	reg clk_120mhz;
+	reg usbclk;
+	reg reset;
+
+	reg [11:0] adc1_data, adc2_data;
+	wire [13:0] dac1_data, dac2_data;
+
+	wire [5:0] usbctl;
+	wire [5:0] usbrdy;
+
+	wire [15:0] usbdata;
+
+	reg WE, RD, OE;
+
+        assign usbctl[0] = WE;
+        assign usbctl[1] = RD;
+        assign usbctl[2] = OE;
+	assign usbctl[5:3] = 0;
+
+	reg tb_oe;
+	assign usbdata = tb_oe ? usbdatareg : 16'hxxxx;
+	reg serload, serenable, serclk, serdata;
+	reg enable_tx, enable_rx;
+	reg [15:0] usbdatareg;
+
+///////////////////////////////////////////////
+//  Simulation Control
+initial
+begin
+	$dumpfile("decim_tb.vcd");
+	$dumpvars(0, fc_tb);
+end
+
+initial #100000 $finish;
+
+///////////////////////////////////////////////
+//  Monitors
+
+reg [7:0] counter_decim;
+wire [7:0] decim_rate;
+assign decim_rate = 32;
+initial $monitor(dac1_data);
+
+       always @(posedge clk_120mhz)
+        begin
+                if(reset | ~enable_tx)
+                        counter_decim <= #1 0;
+                else if(counter_decim == 0)
+                        counter_decim <= #1 decim_rate - 8'b1;
+                else
+                        counter_decim <= #1 counter_decim - 8'b1;
+        end
+
+///////////////////////////////////////////////
+// Clock and reset
+
+initial clk_120mhz = 0;
+initial usbclk = 0;
+always #48 clk_120mhz = ~clk_120mhz;
+always #120 usbclk = ~usbclk;
+
+initial reset = 1'b1;
+initial #500 reset = 1'b0;
+
+
+initial enable_tx = 1'b1;
+
+	wire [31:0] decim_out, q_decim_out;
+	wire [31:0] decim_out;
+	wire [31:0] phase;
+			
+	cic_decim #(.bitwidth(32),.stages(4)) 
+		decim_i(.clock(clk_120mhz),.reset(reset),.enable(enable_tx),
+			.strobe(counter_decim == 8'b0),.signal_in(32'h1),.signal_out(decim_out));
+
+	cic_decim #(.bitwidth(32),.stages(4)) 
+		decim(.clock(clk_120mhz),.reset(reset),.enable(enable_tx),
+			.strobe(counter_decim == 8'b0),.signal_in(32'h1),.signal_out(decim_out));
+			
+endmodule