http://bitcycle.org/electronics/1st_CPLD_project/
https://elecrom.wordpress.com/2008/03/02/getting-started-with-xilinx-xc9536/
http://ad7gd.net/xc9536/
http://homepage3.nifty.com/ARTWEB/cpld1.htm
Korean site
http://afnmp3.homeip.net/~kohyc/armcpld/CPLD_Guide.htm