444 Keysight M8000 Series of BER Test Solutions User Guide
7 Setting up Patterns
LTSSM States
LTSSM transits through various states and sub-states during link
initialization, training, power management and error testing. The entry and
exit of each of these states and the exchange of packets (Ordered sets)
between the two devices during each state is as per the USB
specifications.
LTSSM consist of 12 main link states and their sub-states. These states
and sub-states are responsible for link initialization, training, power
management and error testing.
The following figure displays the top-level states of LTSSM.