moved usrp1 and usrp2 fpga dirs into fpga subdirectory

1 files changed, 50 insertions, 0 deletions

diff --git a/fpga/usrp2/timing/time_transfer_tb.v b/fpga/usrp2/timing/time_transfer_tb.v
new file mode 100644
index 000000000..2b75c60bd
--- /dev/null
+++ b/fpga/usrp2/timing/time_transfer_tb.v
@@ -0,0 +1,50 @@
+
+`timescale 1ns / 1ps
+
+module time_transfer_tb();
+
+   reg clk = 0, rst = 1;
+   always #5 clk = ~clk;
+   
+   initial 
+     begin
+	@(negedge clk);
+	@(negedge clk);
+	rst <= 0;
+     end
+
+   initial $dumpfile("time_transfer_tb.vcd");
+   initial $dumpvars(0,time_transfer_tb);
+   
+   initial #100000000 $finish;
+
+   wire exp_pps, pps, pps_rcv;
+   wire [31:0] master_clock_rcv;
+   reg [31:0]  master_clock = 0;
+   reg [31:0]  counter = 0;
+
+   localparam  PPS_PERIOD = 109;
+   always @(posedge clk)
+     if(counter == PPS_PERIOD)
+       counter <= 0;
+     else
+       counter <= counter + 1;
+   assign      pps = (counter == (PPS_PERIOD-1));
+   
+   always @(posedge clk)
+     master_clock <= master_clock + 1;
+   
+   time_sender time_sender
+     (.clk(clk),.rst(rst),
+      .master_clock(master_clock),
+      .pps(pps),
+      .exp_pps_out(exp_pps) );
+
+   time_receiver time_receiver
+     (.clk(clk),.rst(rst),
+      .master_clock(master_clock_rcv),
+      .pps(pps_rcv),
+      .exp_pps_in(exp_pps) );
+
+   wire [31:0] delta = master_clock - master_clock_rcv;
+endmodule // time_transfer_tb