how to get the data from ADC

If I were you I would use the Picoblaze to talk to the A2D. I'm not
sure how good at VHDL or Verilog you are, but the Picoblaze is an easy
to use softcore CPU availible on the Xilinx Website. You'll write
assembly instructions and connect the output/input port on the
Picoblaze to the A2D. Xilinx has excellent app notes on how to use the
Picoblaze.

Good Luck.