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PCI Express (PCIe) Gen2 / Root is configured, but it does not link up with Gen2 but links up with Gen1. Is there any action required?
PCI Express
Category: PCI Express (PCIe)
tool:-
Device: Cyclone® V
It is necessary to operate Retrain Bit (5th bit of Configuration Register: 0x90).
This operation is required whenever Root is configured on the FPGA.
Reference information
https://www.altera.com/support/support-resources/knowledge-base/solutions/rd03092011_589.html
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