Originally Posted by AndreYang
Northbridge Drive
NNOS and PMOS drive strength decided together the northbridge drive cpu ht bus Electric current intensity.
receiver impedance ---This option will determine the impedance control value of RD580 northbridge with it's HT bus singal.Increase the impedance control value will decrease the signal reflection of the RD580 chip ,,, Higher frequency and stronger CPU HT Bus Drive Strength require larger impedance value.
Set CPU to NB and NB to CPU driving strong .
So we need to set CPU HT bus Drive Strength and RD580 HT Bus NMOS/PMOS to Strong and 31/31.