Dear Oliver Chen,
Our board design was done with ODT impedance 48 ohms for LPDDR4.
However, I can not find 48 Ohms in RPA and MSCALE_DDR_Tool_User_Guide provided by you.
That seems to be the case in the LPDDR4 data sheet.
Does DDRTOOL work correctly when I set 48 Ohms in RPA?