Hi Gerry, Just to supplement Dan's answer a bit:
The 12 ADC inputs are connected to the outside world via SMA connectors. The ZDOK is tied to a bunch of pins on the FPGA and does not go to the ADCs at all. The ZDOK will provide some compatibility with existing boards. I say "some" because the FPGA on this board is not a high-end one like the ones on the ROACH and ROACH2.
Rich
