Ok, now everything seems clearer. So, if I want to send only a single I/Q couple for example at 20 MHz instead of 500 MHz (without serdes but with DDR drivers) I suppose that I need of a dac_clock_in signal of 20 MHz. Can I do this only setting the board with I2C commands or I need to change something in FPGA side (such clock_ref value)?
Rocco
