Teledyne LeCroy Summit T24 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 103)

Summit T24 PCI Express Multi‐Lane Protocol Analyzer User Manual 91
Probe Settings Teledyne LeCroy
5.26 Probe Settings
The Summit T24 analyzer can be optimized for specific DUT signal characteristics. The
auto calibration feature in the Probe Settings allows for better signal recovery. There are
16, 0 db to 15 db, internal equalization modes in the analyzer hardware that boost the
high frequency content of the captured signal. This equalization does not impact the
signal to the DUTs, but helps in ‘opening the eye’ of the captured signal, so that the
internal logic can capture PCIe frames. The system is designed to allow you to manually
set the equalization to one of the sixteen modes for the CTLE values and one of the eight
modes for the DFE values or choose to run an automated algorithm, internal to the
analyzer. This automated calibration sets the optimized values for each of the PCIe
captured lanes, provided that the signal at the analyzer input is stable.
Two lane settings can be configured, CTLE and DFE (Decision Feedback Equalization). CTLE
is two dimensional and is set based on the least number of errors returned. DFE is three
dimensional and is set based on the least number of errors returned by both CTLE and
DFE.
Select Recording Options > Probe Settings from the Setup menu to display Probe
Settings.
Setting Auto Calibration
The Probe Settings tab in the Recording Options dialog displays the equalizer settings. To
set all lanes upstream and downstream check the Set All Lanes box. Click on Auto
Configure to display the Calibrate dialog (see
Figure 5.50 on page 93 ).