Squashed B200 FPGA Source. Code from Josh Blum, Ian Buckley, and Matt Ettus.

Original-commit: 0df4b801a34697f2058b4a7b95e08d2a0576c9db

lib/timing/time_transfer_tb.v

@@ -0,0 +1,55 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+
+
+
+`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_time, pps, pps_rcv;
+   wire [63:0] vita_time_rcv;
+   reg [63:0]  vita_time = 0;
+   reg [63:0]  counter = 0;
+
+   localparam  PPS_PERIOD = 439; // PPS_PERIOD % 10 must = 9
+   always @(posedge clk)
+     if(counter == PPS_PERIOD)
+       counter <= 0;
+     else
+       counter <= counter + 1;
+   assign      pps = (counter == (PPS_PERIOD-1));
+   
+   always @(posedge clk)
+     vita_time <= vita_time + 1;
+   
+   time_sender time_sender
+     (.clk(clk),.rst(rst),
+      .vita_time(vita_time),
+      .send_sync(pps),
+      .exp_time_out(exp_time) );
+
+   time_receiver time_receiver
+     (.clk(clk),.rst(rst),
+      .vita_time(vita_time_rcv),
+      .sync_rcvd(pps_rcv),
+      .exp_time_in(exp_time) );
+
+   wire [31:0] delta = vita_time - vita_time_rcv;
+endmodule // time_transfer_tb