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9
Viewing LTSSM States and State Transitions
Configuring and Computing LTSSM States and Equalization Summary
To view LTSSM data in the LTSSM Overview pane, you need to configure the pane settings and
initiate computation of the LTSSM data display based on these settings.
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Access the captured data along with the U4301A/B setup details in the Logic Analyzer GUI.
Click the Protocol Viewer node connected to the U4301A/B module in the Overview window of the
Logic Analyzer GUI.
Click the LTSSM Overview tab in the lower pane of the Protocol Viewer window.
Configure the LTSSM setup to get a display of LTSSM States/Transition/EQ as per your
requirements.
a To configure how the computed LTSSM data should be organized in the LTSSM Overview pane,
select the appropriate Organize By mode - By Transitions, By States, or By EQ from the Setup
groupbox.
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Transitions displays the LTSSM states transitions in the results for navigating through the
occurrences of the state transition events in the analyzed data.
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States displays the LTSSM states in the results for navigating through the occurrences of
the state entry events in the analyzed data.
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EQ displays the equalization coefficients in the results for navigating through the states
and TS frames in which these coefficients are exchanged and negotiated
b In the Data Range groupbox, specify the start and end range for the captured data in the trace
for which you want to display the LTSSM data. Only the specified range of data is analyzed to
detect the LTSSM states and equalization summary. The default selections in the Data Range
group box ensure that the LTSSM data is displayed for the entire trace. However, you can set
markers in the packets listing in the upper pane and then specify the data range using these
markers so that LTSSM data is displayed only for that specific range of packets.
c Select the Compute EQ checkbox if you want to compute the equalization summary data along
with computing the LTSSM states and transitions. If you do not select this checkbox, then only
LTSSM states and transitions are computed.
Click the Compute button displayed with the Data Range fields. There are following two options
available as a drop-down menu with this Compute button.
• Compute All allows you to compute traffic overview statistics, decoded transactions, offline
performance summary, and LTSSM data (in their respective tabs) for the captured packets by a
single click of this button.
• Compute This allows you to compute only LTSSM data from the captured packets. When you
click Compute, then also only LTSSM data is computed.
Keysight U4301 PCIe Gen3 Analyzer User's Guide
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