Teledyne LeCroy QPHY-LPDDR2 - Manual (Page 28)

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QPHY-LPDDR2-OM-G Rev B
Checking this box allows:
Calibration of gain/offset only
Calibration of deskew only
Access to the advanced menu (shown as a tab behind the "Probes Cal" dialog)
Gain/Offset Only
Pressing this button performs only the DC calibration of the probe on the specified channel. See details of
DC Calibration Theory of Operation in TF-DSQ Operation Manual. DO NOT use with PCF200 connected
to Fast Edge output.
Deskew Only
Pressing this button performs only the deskew calibration of the probe on the specified channel. See
details of Deskew Theory of Operation in TF-DSQ Operation Manual.
This is the button to use with PCF200 connected to Fast Edge output.
The Advanced Menu
Figure 19. Probes Calibration menu Advanced tab
The Advanced Menu contains information and functionality useful to the advanced user of the PCF200
fixture. These include:
• Rise Time Skew Correction
• Differential(or Single-Ended) probe selection
• Deskew All (or common deskew capability)
• Common mode voltage settings for DC calibration
Rise Time Skew Correction
This field shows the signal risetime and the corresponding skew correction based on the signal risetime.
When probes are deskewed, the risetime measurement of the edge used for deskewing is displayed in
the Rise Time field corresponding to the probe and probe channel, and an additional skew correction of
zero is applied.
The measured risetime of the signals encountered can be entered into the Rise Time field, and the
oscilloscope automatically calculates and applies a new skew correction value to be utilized in addition to
the deskew amount calculated during the deskew calibration procedure. With this use, a finer deskew
calibration is performed because the risetimes of the signals measured are now taken into account. Refer
to the Deskew Risetime Adjustment Theory of Operation in the TF-DSQ Operator’s Manual on the LeCroy
website for details.