Teledyne LeCroy QPHY-DDR4 - Manual (Page 27)

QPHY-DDR4 Software Option
Advanced Settings - Custom Levels
Standard, Custom or Auto Levels
This variable allows the user to use either Standard, Custom, or Auto Levels. Standard uses the levels
defined by the JEDEC specification. Custom uses the VIH/VIL AC/DC levels defined by the custom levels
variables. Auto uses the levels QPHY automatically calculates from the top and base of the acquired
waveform. The VIH and VIL levels are calculated using AC120. These levels are reported to the user
during the test and Vref(DQ) is recorded in the report. The default value for this variable is Auto.
Figure 13 – Example of Auto Levels Reported During Test
VDD, VDDQ, VIH(ac), VIH(dc), VIL(ac), VIL(dc), Vref, VSS
These variables allow the user to enter custom values to be used for each level. The units for each
variable are in mV. These variables are only used when Custom levels are in use.
Probe Setup - Common Variables
This section will cover variables which are common to all Probe Setups. Variables which are specific to
each individual Probe Setup are cover in a section dedicated to that Probe Setup.
Probe Tip Selection
This variable will allow the user to select which probe tip is being used. Possible selections include SI, PT,
SMA/SMP, SP, and HiTemp. The default selection is SI.
Channel Gain
Allows the user to manually specify the vertical scale in V/div.
Channel Index
Allows the user to manually specify the channel index.
Channel Invert
Allows the user to invert the selected signal.
Channel Offset
Allows the user to manually specify the offset in Volts.
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