Keysight Technologies U4301 User Manual page 105

LTSSM State Results
LTSSM States List Display section
LTSSM States/Transitions Navigation
section
NOTE
Keysight U4301 PCIe Gen3 Analyzer User's Guide
Description
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. In the above screen, LTSSM states are displayed for both
upstream and downstream directions.
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.
This section displays a list of the applicable LTSSM states or state transition names. The display of states or transitions in
this section depends on whether you selected Transitions or States organization mode in the Setup groupbox. In the above
screen, the display and organization in the navigation section is as per the Transitions mode.
For each of these states/transitions, the section displays the number of events representing the number of occurrences of
these states or transitions in the analyzed data. For instance, in the above screen, the transition from Rcvr.Idle to L0 state
occurred 8 times in each upstream and downstream direction making the total occurrences of this transition 16.
Using this section, you can easily navigate through these occurrences of LTSSM states or transitions and the packets
exchanged during these occurrences.
You can also view L1 substates (L1.1 and L1.2) and their transitions in the computed LTSSM
states data. To ensure the inclusion of these substates in the computed LTSSM data, you must
set the Store CLKREQ# Transitions field to Enabled in the Trigger dialog box before starting the
data capture.
Viewing LTSSM States and State Transitions 9
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