Teledyne LeCroy QPHY-DDR4 - Manual (Page 34)

Figure 18 - Oscilloscope Configuration after tJIT(cc)_total and tJIT(cc)_dj Tests
Shown on this screen:
• RjBUjSpect is the RjBUj Spectrum of the differential clock signal. The signal type on the signal input
section of SDA III is setup to measure a Clock and to use “Cycle-Cycle” as the Jitter Parameter.
Figure 19 - tJIT(cc)_total and tJIT(cc)_dj Results
In the SDA Jitter section:
• Tj(1e-12) is the total jitter calculated using the spectral direct method in SDA III. The user can modify
the BER level using the Jitter BER Level variable (see the QPHY-DDR4 Variables section for
more information). This value is reported as tJIT(cc)_total in ps for informational purposes. The
value is also reported in UI to be tested against the limit from the specification.
• Rj(spD) is the random jitter calculated using the spectral direct method in SDA III. This value is
reported for informational purposes.
• Dj(spD) is the deterministic jitter calculated using the spectral direct method in SDA III. This value is
reported as tJIT(cc)_dj in ps for informational purposes. The value is also reported in UI to be
tested against the limit from the specification.
tERR(n Per), Cumulative Error
tERR(n Per) is defined as the cumulative error across n multiple clock cycles from tCK(avg).
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