There is slight confusion while viewing signal quality for ddr4 single ended as well as differential signals, In datasheet it is mentioned:-
whereas for differential signals it is mentioned as
VIH(ac)_diff_min = 300mV
VIH(dc)_diff_min = 200 mV
VIH(dc)_diff_max = 200 mV
VIH(ac)_diff_max = -300 mV
so i should consider eye mask from 300 to -300 mV for differential signals or add 600 mV in it to get eye mask from 900 to 300 mV, signals DQS_c and DQS_t will never come to -300 mV.
WHAT IS THE INTERPRETATION FROM -300 TO 300 mV, Does this is simply specifying the voltage swing or voltage levels ?