ISim log file
Running: F:\WORKAREA\manip\led_switch_isim_beh.exe -intstyle ise -gui -tclbatch isim.cmd -wdb F:/WORKAREA/manip/led_switch_isim_beh.wdb 
ISim P.58f (signature 0x7708f090)
This is a Full version of ISim.
Time resolution is 1 ps
# onerror resume
# wave add /
# run 1000 ns
Simulator is doing circuit initialization process.
Finished circuit initialization process.