6.1.1. Debugging Link Training Issues
The Physical Layer automatically performs link training and initialization without software intervention. This is a well-defined process to configure and initialize the device's Physical Layer and link so that PCIe packets can be transmitted.
- Link fails to negotiate to the expected link speed.
- Link fails to negotiate to the expected link width.
- LTSSM fails to reach/stay stable at L0.
Use the flow chart below to identify the potential cause of a link training problem when using the R-Tile Avalon-ST IP for PCI Express.
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