Teledyne LeCroy QPHY-DDR4 - Manual (Page 40)

Figure 24 - DQ Input Compliance Mask Results
In the Measure section:
• tBurst W (P2) displays the number of W bursts detected in the acquisition.
• ClockFreq (P8) is the measured clock frequency from the acquired waveform
VIHL_AC, DQ AC Input Swing Pk-Pk
VIHL_AC will test the peak to peak amplitude of the DQ signal for each UI. The DQ signal must meet or
exceed the specified level at any point over the total UI. It is measured as a peak to peak voltage
centered at Vref.
After the completion of the VIHL_AC test the oscilloscope is in the following configuration:
Figure 25 - Oscilloscope Configuration after VIHL_AC Test
Shown on this screen:
• F7 is the DQ eye diagram of the write bursts from the acquired signal. The DQS signal is the timing
reference for this eye diagram. This math function is assigned an alias based on the assigned DQ
signal name. The number of bits contained in the eye diagram is displayed in the bottom row of
the F7 descriptor box. In this case there are 5,136 DQ bits in the eye.
Figure 26 – VIHL_AC Results
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