Post Go back to editing

a question of use of ad9674


I'm bringing up a board with AD9674. I Initialized the chip as suggested in the datasheet. In result I'm getting dclk and fclk out, but the data lines are always '0'. Any suggestions what may be missing from the config? I would expect data lines to be toggling. I also tried to enable internal digital pattern, but with no result.

Thanks for help,