Figure 32 – srin_divw test results, Tdvac, time above ac level – Teledyne LeCroy QPHY-DDR4 User Manual

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• Z3 is a zoom of F3, the acquired DQ signal after any probe deskew has been applied. The zoom is

position at the location of the “worst case” Slew_R measurement indicated by t@SRINRmin. A
trace label is applied on this trace according to the signal name assigned to DQ. This signal is not
measured in this test and is only provided as a visual reference.

Figure 32 – SRIN_dIVW Test Results

In the Measure section:

SRIN_dIVWR (P1) is measuring the slew rate of DQS on the rising edges. The slew rate on the

rising edge is measured from Vref to VIH(ac). The minimum value is the measured value for
SlewR of DQS min
. Since the limit in the specification is undefined this test is Informational Only.

tDQDQS (P2) is measuring the skew between DQ and DQS. Since this measurement is performed

once per burst, this shows how many W bursts were in the acquired waveform.

t@SRINRmin (P4) displays the location of where the minimum value of Slew_R occurred. This is

used to position the zoom traces at the location of the “worst case results”.

P5: slew(Z3) displays the minimum value of Slew_R and is used to display the slew rate

measurement markers.

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