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P5020 PCIe lane reversal

Question asked by kyleb on Jul 21, 2017
Latest reply on Jul 24, 2017 by ufedor

Hello, I am using a P5020 where the PCIe controller 1 is configured as a x4 and the PCIe controller 2 is configured as a x1. The PCIe x4 enumerates but the x1 does not. One possible reason is due to the x1 being connected to Lane H on the P5020 (signal names SD_RX07, SD_TX07, and their complements) rather than the perhaps preferred Lane E. NXP has indicated that the PCIe controller does have the ability to perform a lane reversal, but I do not see anything that indicates whether this is an automatic process or something that must be commanded via a register?

 

Thanks in advance!

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