Teledyne LeCroy Summit T3-8 PCIe Multi-lane Protocol Analyzer User Manual - Manual (Page 113)

Summit T3‐8 PCI Express Multi‐Lane Protocol Analyzer User Manual 101
Probe Settings Teledyne LeCroy
5.26 Probe Settings
The Summit T3‐8 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.
Each lane can be configured to use specific equalization settings to match signal
characteristics of the lane and improve the analyzer’s ability to capture error free traces.
For 2.5/5.0 GT/s speeds only CTLE setting is required to achieve good captures. For 8.0GT/
s you can adjust CTLE, DFE and DC Gain parameters.
Select Recording Options > Probe Settings from the Setup menu to display Probe
Settings.
5.26.1 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 (see Figure 5.52) to display the Calibrate dialog (see
Figure 5.53 on page 103 ).