i am following instructions as per below link
Building HDL [Analog Devices Wiki]
I have downloaded Cygwin exe, but unable to get, please suggest how to make Cygwin working.Please guide what settings should be done
You don't seem to have set the PATH to vivado. From the link you have referenced (change depending the current path and hdl release you are using):
export PATH=$PATH:/cygdrive/d/Xilinx/Vivado/2015.4/bin export PATH=$PATH:/cygdrive/d/altera/15.1/quartus/bin64
Retrieving data ...