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`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
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