Teledyne LeCroy QPHY-DDR4 - Manual (Page 39)

QPHY-DDR4 Software Option
contained in the eye diagram is displayed in the bottom row of the F6 descriptor box. In this case
there are 5,136 DQS bits in the eye.
• F7 is the DQ eye diagram of the W bursts from the acquired signal. 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.
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
DQ Input Compliance Mask
This test will test the DQ W eye against the mask defined in the specification. The mask is created from
the TdIVW_total (0.2 UI) and VdIVW_total (136 mV) limits.
After the completion of the DQ Input Compliance Mask test the oscilloscope is in the following
configuration:
Figure 23 - Oscilloscope Configuration after DQ Input Compliance Mask 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.
Any mask failures are reported as Eye Mask Hit. Any mask hits result in a failure for this test.
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