vhdtdtfi -lib work source/Frequency_Generator.vhd -prj pwm -o Frequency_Generator.spl -module Frequency_Generator -template C:/Xilinx/13.1/ISE_DS/ISE//data/splfile.tft -deleteonerror 
spl2sym -intstyle ise -family spartan3a -w Frequency_Generator.spl E:/ProjFPGA/UNIC_3A/pwm/Frequency_Generator.sym