In module's declaration or its instantiation, set the following
two generic parameters accroding to your design:

F_REFCLK is the frequency of the GTX reference clock
USE_TRIGGER_PORT is default to true, but if you do not have trigger data
to be sent through the link, you must set it to false. Otherwise, without
TTCclk present, TTS signal can not pass the link

please include the following two lines in your UCF file:

NET "*/i_DAQ_Link_V6/usrclk" TNM_NET = "DAQ_usrclk";
TIMESPEC "TS_DAQ_usrclk" = PERIOD "DAQ_usrclk" 4.0;

where i_DAQ_Link_V6 is the instance name of the module DAQ_Link_V6
in its upper level module.

This zip file includes following files:

DAQ_Link_V6.vhd		top level module
EthernetCRCD32.vhd
CRC16D16.vhd
TTS_TRIG_if.vhd
RAM32x6Db.vhd
Hamming.vhd
DAQLINK_gtx.vhd
ReadMe.txt		this file