Hi,
Please follow my instruction at the link below. You can find it the information at the end of this posting. After plugging in with mini-USB cable to your PC, hit "Reset USB" multiple times.
http://e2e.ti.com/support/data_converters/high_speed_data_converters/f/68/t/285568.aspx
With this GUI, you can try internal test pattern such as ramp after enabling digital function.
Thanks,
KW