I'm using your default FPGA reference design and no-OS driver codes(ramp test mode). I can see samples on ILA.
Ramp data looks like this: 1,2,3,4,5,6.... I had expected repeating values but there is no duplicate value.
I also examined your block design.
adc_data_0[63:0] means Channel 1 and adc_data_1[63:0] means Channel 2.
I could not understand which bytes are I and which ones are Q.
Thanks in advance.