Please tell me about the question.
He recommended setting value is 1.
Why is this?
DRAM_Data is single-end signals.
So I think it is "CMOS input type" setting.
DDR / CMOS Input Mode Field
Select one out of next values for group: DDRMODE (Pads: DRAM_D[63:0]).
0: CMOS input type
1: Differential input mode (recommended)"