ISim log file
Running: F:\WORKAREA\blink_led\test_isim_beh.exe -intstyle ise -gui -tclbatch isim.cmd -wdb F:/WORKAREA/blink_led/test_isim_beh.wdb 
INFO: There is another simulation running in the same directory. Using database file name isim1.wdb.
ISim P.58f (signature 0x7708f090)
This is a Full version of ISim.
Time resolution is 1 ps
# onerror resume
# wave add /
# run 500000000000 ns
Simulator is doing circuit initialization process.
Finished circuit initialization process.
Stopped at time : 77505748570 ns : File "F:/WORKAREA/blink_led/blinking.v" Line 37
# run 1.00us
# run all
Stopped at time : 78050662770 ns : File "F:/WORKAREA/blink_led/test.v" Line 52