Teledyne LeCroy QPHY-PCIe3-Tx-Rx - Manual (Page 24)

20 923662 Rev B
QPHY-PCIE3-TxRx Variables
D EMO M ODE
This variable allows you to run the tests in demo mode. When this value is Yes, the tests can be
run in demonstration mode using saved waveforms. The demo mode waveforms must be
located in D:\Waveforms\PCIE3\Demo. They must be named
M1_L_DEMO_8G_Ln0_P7_00000.trc and M2_L_DEMO_8G_Ln0_P7_00000.trc. There is only
one pair of demo waveforms, so the Preset Test is expected to fail (since the script will store the
same waveform every time). Signal Quality test will pass.
During demo mode, you are still prompted with connection diagrams based on their other
variable selections. This allows you to experience running the test as it would be run on live
signals. The default value for this variable is No.
DUT T YPE
This variable loads the test script for either Add-in Card testing or System testing. The two
different scripts determine which connection diagrams are shown, and (for TX) whether clock is
saved and then tested together with data. It does not affect Rx calibration, and only affects a
connection diagram for Rx test.
S AVE W AVEFORM P ATH
This variable holds the path on the oscilloscope where the RX cal will store waveforms. Default
value is D:\Waveforms\PCIE3\
RX”. For TX testing, this path is read and if the last two letters
are “RX” then they are replaced by “TX”. If the last two letters are not RX then the same path is
used. NOTE: this script does not archive waveform results; both the RX test and the TX test
clear the directory at this path when they start. The generated report is the saved result. If you
want the waveforms, which are very large, you must save them after the test completes.
S PLITTERS I N U SE
This variable specifies whether the connections are set up for the Link Equalization test; that
setup uses power splitters and the signals seen by the scope are half the nominal signal
amplitude. If the connection diagrams in the script are followed, then splitters are not used.
S IGTEST P ATH
This variable sets the path to the installed version of SigTest.exe on the oscilloscope. The script
runs SigTest on the oscilloscope, and fetches results from there for testing and inclusion in the
log. Sigtest Version must be 3.2.0 or later.
S TOP A FTER E ACH T EST
When set to Yes, the script will stop after each test to allow for result reviewing. In the RX
calibration, this
opens the “OK to continue?” prompts, which also gives you a chance to abort
after 1) the calibration of the presets, 2) the Rj cal, 3) the Sj cal, and 4) the final Eye height and
width adjustment. This setting has no effect on the TX tests. Note: after initial setup, the script
always stops to give you a chance to adjust V/div and possibly offset settings. That is
independent of this variable.