Altera: What does PCI-Express LTSSM function do? - Semiconductor Business -Macnica

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Altera: What does the PCI-Express LTSSM feature do?

PCI Express

LTSSM (Link Training and Status State Machine) is a state machine that manages link status such as link initialization, training, and error recovery.

The following states exist:

state	meaning
Detect	Perform far-end receiver detection
Polling	Sends and receives training sequences, performs bit synchronization, symbol synchronization, and lane polarity detection, and determines the data rate.
Configuration	By sending and receiving training sequences, the link lane configuration is established, and inter-lane deskew and scrambling are set.
Recovery	Restoring the link
L0	normal operating state
L0s	States that reduce power consumption
L1	State that saves more power than L0s, but must go through Recovery state to return to L0 state
L2	Power consumption can be reduced even more than the L1 state, the transmitter and receiver functions are stopped, and the main power supply and clock are not guaranteed.
Disable	Link disabled
Loopback	state for debugging
Hot Reset	Transition when instructed by upper layer or when Hot Reset is instructed by link control

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