Many thanks for your support. our setup with reference design starts to work.
We now are looking at axi_ad9144 block. Reading its wiki page , AXI_AD9144 IP core [Analog Devices Wiki] , does DAC_DATAPATH_DISABLE work in axi_ad9144 block?
by default, it is set to 0. and we see continue sine wave when it is running.
What shall I expect if DAC_DATAPATH_DISABLE is set to 1?