kintex7 fpga and FMC150 target reference design

Greetings everyone,
i would be grateful if some one handled the reference design from avnet that uses the KC705 board and the fmc150 AD/DA card, this design can be found at **broken link removed** , in this design when i insert a signal on chA alone and chB is left unconnected , i obtain the signal on the chipscope also the same with chB when i connect the signal to it and leave chA unconnected ,i obtain the signal on the chipscope, BUT when i insert a signal on both chA and chB at the same time , the view of signal is not correct, i know there is some way of multiplexing the data of the 2 channels to pass them to the DDC inputs but whenever i try to demux the signals from the 2 channels and display the signal coming from chA alone and the signal from chB alone on an ILA view i don't get them right.

please if someone worked before with this reference design and know a way of how to demux the data from the chA and chB ,would he share it?

thanks in advance.