///////////////////////////////////////////////////////////////////////////////// Copyright (c) 2003 Xilinx, Inc.// All Rights Reserved/////////////////////////////////////////////////////////////////////////////////   ____  ____//  /   /\/   /// /___/  \  /    Vendor: Xilinx// \   \   \/     Version: 1.0//  \   \         Application : XAPP868//  /   /         Filename: ph_meter.v// /___/   /\     Timestamp: Thu Jan 17 2008// \   \  /  \//  \___\/\___\/////////////////////////////////////////////////////////////////////////////////`timescale 1ns / 1psmodule ph_meter(in_sig_1, in_sig_2);   input   in_sig_1;   input   in_sig_2;   //output time out_ph1;      real phase;   reg  alt=0;   real out_ph1;   real strt;   real stp;      always @( in_sig_1)   begin: xhdl0      //time    strt;      //time    stp;      //time    diff;                    if (in_sig_1 == 1'b1 & ~(alt))      begin         strt = $realtime;         alt = 1;      end   end      always @( in_sig_2)   begin: xhdl1        if (in_sig_2 == 1'b1 & (alt)& $realtime>strt)      //if (in_sig_2 == 1'b1 & $realtime>strt)      begin        stp = $realtime;        	     phase = (stp-strt)/0.5e3;	     alt = 0;      end   assign out_ph1 = phase;   end  endmodule