Hi,
The IMX8HWDG document has the following general design recommendations:
3.4.6 LPDDR4-2400/3200 general design recommendations
Use PCB materials with good dielectric constants ( < 3.7 @ 5 GHz is desired). Some examples are Megtron6, Megtron4, ThunderClad2, and MCL-HE-679G Type(S).
However, to reduce the unit cost, I want to use PCB (185HR) with < 3.88 @ 5 GHz.
Can you give me your opinion on the above?