Keysight Technologies U4301, User Manual

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Keysight U4301 PCIe Gen3 Analyzer User’s Guide 107
Viewing LTSSM States and State Transitions 9
Exporting Equalization Summary Data to an Excel File
You can export the computed equalization summary data to an Excel file by performing the following
steps.
1 In the
LTSSM Overview tab, click the File option displayed in the right most section.
2 Select the Export as XLSX To File... option.
Equalization Summary
Results Description
LTSSM States List Display
section This section displays a list of the LTSSM states in the sequence in which these occurred in the trace or the specified part of
the trace. The states are grouped and listed for a link direction.
For each state in this list, the applicable link speed during the state is also displayed. Clicking a speed in this list highlights
the packet representing the transition to that speed in the upper pane of the Protocol Viewer.
When you click a state in the list, the packet that is exchanged as the first packet for that state occurrence is highlighted in
the upper pane of the Protocol Viewer. This provides you a quick start point for viewing and navigating through the packets
exchanged during a particular state.
Moving the mouse pointer to a state presents a tool tip with useful information about the state such as the time tag for the
state and the packet exchanged at the state change.
Equalization Coefficients
Exchanged on each Lane This section displays a list of Equalization Transmitter coefficients. For each of these coefficients, the section displays the
number of events representing the number of times that coefficient has been exchanged in TS frames on each of the
configured lane. For instance, in the above screen, the Cursor coefficient has been transmitted six times on lane 2 in the
downstream direction.
In this section, you can double-click a particular coefficient occurrence number and then use the Navigation bar to easily
navigate to the packet and LTSSM state associated to that coefficient occurrence.
The number of lanes displayed in this section depend on the number of lanes that you configured in the Connection Setup for
data capture.
Equalization Changes
Summary as per LTSSM
States Sequence This section displays a summary of the equalization changes and negotiations found in the trace. This summary is organized
as per the equalization-specific LTSSM states in the sequence in which these states occurred in the trace. With each of these
states, the following equalization related data is shown:
• # of TS: The number of TS frames exchanged for that specific LTSSM state.
• Equalization coefficient values communicated in TS frames on each configured lane. If you see a ** value for FS or LF
coefficients, then it indicates that these values are not available in the trace.
• Reject - Indicate the acceptance or rejection of the coefficient negotiation by the link partner. Displays 0 for acceptance
and 1 for rejection.
• Absolute time - This time is calculated based on the absolute time of the first packet associated to the selected LTSSM
state.
• Delta time - The time difference between the first and last packet captured for the selected LTSSM state.
In this section, you can click a particular row to easily navigate to the packet and LTSSM state associated to that row of
equalization data.