I'm working with ADI AD-FMCJESDADC1-EBZ Board using reference design from wiki ADI AD-FMCJESDADC1-EBZ Boards & Xilinx Reference Design [Analog Devices Wiki] I have to change sampling frequency on AD9250. I modify two register in ad9517_setup() to divide VCO frequency.
fmc176_spi_write(FMC176_AD9517, 0x0190, sel) for AD9250 sel=0x21 for 250MHz sel=0x55 for 100MHz
fmc176_spi_write(FMC176_AD9517, 0x0199, sel) for FPGA, GTX
When I change these two register, ACD was resynchronized and on the terminal was shown error "JESD link/lane errors!!" every time.
What should i do to change these frequency?