I don’t have access to CW305, but I did it on Spartan7 dev board. (I also created a thread on it here.)
I’m pretty sure you can do it too on CW305 (I’ve seen it somewhere, but I cannot find it now).
You can start with example implementation first:
https://wiki.newae.com/Tutorial_CW305-1_Building_a_Project
https://wiki.newae.com/Tutorial_CW305-2_Breaking_AES_on_FPGA
Your traces should look like this:
