Teledyne LeCroy QPHY-PCIe - Manual (Page 23)

QPHY-PCIE Operator’s Manual
QPHY-PCIE Variables
C LEAN C LOCK
This variable allows the user to select whether or not they are using a clean clock. This variable maps
directly to the clean clock variable in SigTest. When set to Yes, this variable guarantees that the clock
does not have SSC and is known to be good. This variable should be set to Yes for add in card testing
(using a CBB, which generates the clock), and No for a system board test (because the System board
generates the clock). This control is only of use in the 2.5GT/s testing. The new SigTest algorithm for 5G
does not ask for this input. The default value for this variable is No.
D ESKEW V ALUE IN P ICOSECONDS
This variable allows the user to specify the channel + cable deskew between channels C2 and
C3. The value is in picoseconds and is applied to the channel C2. This value is only applied to
C2 if “User Defined” is selected for the Deskew measure mode method variable.
D ESKEW M EASURE M ODE M ETHOD
This variable allows the user to select the method for deskewing their cables. The choices for
this variable are “Wizard Method” and “User Defined.” “Wizard Measured” is used to launch the
automated deskew measurement. “User Defined” is used if the user would like to set the
Deskew value in picoseconds variable when the deskew value is already known. The default
value for this variable is “Wizard Method.”
D EVICE T YPE
This variable allows the user to select whether device type is a System Board or an Add-in
Card. When testing System Boards both the clock signal and the data signal must be captured
simultaneously. When testing Add-In Cards only the data signal is required for testing. The
default value for this variable is System.
F ORM F ACTOR
This variable allows the user to select whether their form factor is Desktop or Mobile. This
variable maps directly to the form factor variable in SigTest. The default value is Desktop.
S AVED W AVEFORM P ATH
This variable allows the user to specify the path that saved waveforms are recalled from when
running in demo mode or when TestMode is “Use Saved Data.” The default value for this
variable is “D:\Waveforms\PCIe.”
Waveforms are saved in a directory with the name of the Device Under Test, under this path.
The saved waveforms have a channel name prefix (such as "C2") followed by the bit rate,
deemphasis setting, and lane number; and the extension ".trc". For example:
C2_2.5GT_3.5dB_L0.trc. If the Test Mode variable is set to Use Saved Data the script will look
for files in the appropriate directory and with exactly these names, to repeat the tests using
previously saved data.
T EST M ODE
This variable allows the user to decide whether the tests should be run on newly acquired data
or if previously saved waveforms should be used. The choices for this variable are “Acquire
New Data” and “Use Saved Data.” If “Use Saved Data” is selected, the waveforms are recalled
from the location specified in the Saved Waveform Path variable. The default value for this
variable is “Acquire New Data.”
922543 Rev Error! Reference source not found. 19