U4301B Datasheet, PDF (11/19 Pages) Keysight Technologies – PCI Express 3.0 Analyzer Module

11 | Keysight | U4301B PCI Express^® 3.0 Analyzer Module - Data Sheet
Product Features and Benefits Overview (Continued)
LTSSM L1 substate analysis
PCIe version 3.1 has added new LTSSM states for extremely low power states called L1
substates, which enable PCIe to reduce the power consumption to just a few microwatts.
Validating this power consumption and performance of a PCIe device has never been easier.
The U4301B protocol analyzer can capture the CLKREQ# signal that is used to control the
operation of L1 substate operation, and provide the information needed to accurately verify the
link state.
Figure 13. State analysis is synchronized with the packet trace to provide clear timing information for all the critical events.
Analyzing the device power consumption
Only Keysight can synchronize and display the information from an oscilloscope with the PCIe
packets to give the insight needed to understand the state of the device and the power usage
in all phases of operation. Simple network connections allow the protocol analyzer to control
the Keysight oscilloscope and download the synchronized data onto a single display for your
analysis needs.
Figure 14. The data from the oscilloscope is display on the same time scale to show the exact voltage, current, and power consumption of the device.