Teledyne LeCroy QPHY-LPDDR2 - Manual (Page 43)

QPHY-LPDDR2 Software Option
QPHY-LPDDR2-OM-G Rev B
43
AC Undershoot, Maximum peak amplitude
Maximum peak amplitude allowed for undershoot area.
Figure 22. Differential signal levels [JESD209-2D figure 115]
VIX
Figure 23. VIX Definition [JESD209-2D figure 111]
Timing Tests
Read Bursts
tDQSQ, DQS-DQ Skew for DQS and Associated DQ Signals
Maximum skew between the DQS line and the associated DQ line within a read burst
Measure timing from DQS at VREF to DQ rising at VIH(ac)min and falling at VIL(ac)max.