When I switch Quartus from 18.1std to 19.4 Pro,Quartus report an error, The ID is ID:18694
ID:18694 The reference clock on PLL "<name>", which feeds an Altera LVDS SERDES IP instance, is not driven by a dedicated reference clock pin from the same bank. Use a dedicated reference clock pin to guarantee meeting the LVDS SERDES IP max data rate specification.
because of the no clk from Dedicated reference clock , I use Pll cascade.
My quest is how to work around it ? I hope to use Quartus Pro .
Kindly fine the inline reply
CAUSE: PLLs driving LVDS SERDES interfaces should use dedicated reference clock pins from the same bank. Using a different source such as a global clock or PLL cascading can add extra jitter and has not been fully verified and characterized by Intel. It is therefore not guaranteed to meet its max data rate specification.
ACTION: Use a dedicated reference clock pin per PLL that drives an Altera LVDS SERDES IP instance.