Teledyne LeCroy QPHY-LPDDR2 - Manual (Page 42)

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QPHY-LPDDR2-OM-G Rev B
The lowest number must be greater than or equal to the minimum limit and the highest number must be
less than or equal to the maximum limit.
VIH(dc), minimum DC input logic high
Measure the local minimum and maximum values from the first VIH(ac)min crossing point to the time
corresponding to VIH(dc)min crossing a 1V/ns slewrate slope to VREF. If multiple pulses are measured,
take the lowest, respectively the highest, number as the worst case.
The local minimum must be greater than or equal to the minimum limit. The local maximum must be less
than or equal to the maximum limit.
VIL(ac), maximum AC input logic low
Measure the local minimum value from VREF to VREF of the low pulse histogram. If multiple pulses are
measured, take the lowest number and the highest number as the worst cases.
The lowest number must be greater than or equal to the minimum limit and the highest number must be
less than or equal to the maximum limit.
VIL(dc), minimum DC input logic low
Measure the local minimum and maximum values from the first VIL(ac)max crossing point to the time
corresponding to VIL(dc)max crossing a 1V/ns slewrate slope to VREF. If multiple pulses are measured,
take the lowest, respectively the highest, number as the worst case.
The local minimum must be greater than or equal to the minimum limit. The local maximum must be less
than or equal to the maximum limit.
VSWING(MAX), input signal maximum peak to peak swing
Measure the peak to peak value of the signal in a given Write frame. .If multiple frames are measured,
take, the highest number as the worst case.
The measure must be less than or equal to the limit.
AC Over/Undershoot
AC Overshoot, Maximum peak amplitude
Maximum peak amplitude allowed for overshoot area.
AC Overshoot, Maximum overshoot area above VDDQ
Prerequisite: AC Overshoot maximum peak amplitude, needed to compute area.
Maximum overshoot area above VDDQ.