set XILINX=C:\Xilinx
call "C:\Xilinx\bin\nt\xst.exe" -ifn U4.xst >> synthesize.plg
copy /Y synthesize.plg temp.log
call "C:\Xilinx\bin\nt\ngc2hdl.exe" -ofmt verilog -intstyle silent -w U4.ngc  U4.v >> synthesize.plg
