PCIe link initialization & Training

The link initialization process refers to the link from Power-On Or reset to full operation L0 Process of state .

summary

Link initialization and training are pure hardware processes controlled by the physical layer , It mainly configures and initializes equipment links and ports , The purpose is to carry out normal packet communication on the link .

Ordered Sets In Link Training

LTSSM

Detect state

Polling state

Configuration status

L0 state

Restore the state

Dynamic bandwidth change

Configure related registers