Teledyne LeCroy QPHY-DDR4 - Manual (Page 24)

QPHY-DDR4 Variables
Custom Speed Grade in MT/s
This variable allows the user to define a custom speed grade to be used. This speed grade is used to set
the oscilloscope timebase and sampling rate, see Clock Period Per Screen Division for more
information. The default value for this variable is 0. Using the default value, QPHY will read the speed
grade from the selected limit set.
Waveform Path
This variable allows the user to specify the path on the oscilloscope to save and recall waveforms. When
Use Stored Waveforms is set to No, the acquired waveforms will be saved in this path in a subfolder
with the name provided as the Device Under Test in the Session Info prompt at the beginning of the test.
See Appendix A for details on the File Name Conventions For Saved Waveform Data. When Use Stored
Waveforms is set to Yes, QPHY will load saved waveforms from this path using a subfolder with the
name provided as the Device Under Test in the Session Info prompt. The default value for this variable is
D:\Waveforms\DDR4.
Script Execution Settings
Enable Prompt before Signal Acquisition
When set to True a prompt will appear to begin the signal acquisition sequence. This will allow the user to
generate read/write bursts at the start of the acquisition or modify the trigger conditions before signal
acquisition. The default value for this variable is False.
Silent Mode
This variable allows the user to run QPHY without any user interaction when it is set to Yes. The default
value for this variable is No.
Stop On Test
When set to Yes, the script stops after each test allowing the user to view the results. The setup is saved
so the oscilloscope settings can be modified by the user to allow for further debug results. Upon
completion of debugging, testing can be seamlessly resumed with one click of a button. The default value
for this variable is No.
Signal Names
These variables give the user control over the signal names which appear in the test report and
screenshots.
DQ Signal Name
This variable allows the user to assign a name to the DQ signal to appear in the test report and
screenshots. The default signal name is DQ0.
DQS Signal Name
This variable allows the user to assign a name to the DQS signal to appear in the test report and
screenshots. The default signal name is DQS0.
DQS_t Signal Name
This variable allows the user to assign a name to the DQS_t signal to appear in the test report and
screenshots. The default signal name is DQS0_t.
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