BECKHOFF EtherCAT IPCore Section III - Manual (Page 14)

EtherCAT IP Core for Xilinx FPGAs
Slave Controller – EtherCAT IP Core Data Sheet Addendum 11
3.3.3.5 Vivado until 2014.1: The ZC702 AXI Vivado example design is not synthesizable
The ZC702 AXI Vivado example design was developed for Vivado 2014.2 and later, and it is incompatible with previous Vivado versions.
Solution
Use Vivado 2014.2 with the patch or a later Vivado version.
3.3.4 Vivado 2013
3.3.4.1 Vivado 2013.2 with EtherCAT IP Core until V3.00f: IP License issue
The license string used by the EtherCAT IP Core before V3.00g is not accepted by Vivado 2013.2. Note that the license key style change was not communicated to Beckhoff.
Solution
 use Vivado 2013.3 or later, or
 use EtherCAT IP Core V3.00g or later, or
 refer to Answer Record 56630 for a Vivado 2013.2 patch required to use the EtherCAT IP Core before V3.00g