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No output signal on PCIe TX Pins after SoftReset

Question asked by Moritz Julen on Nov 24, 2016
Latest reply on Nov 25, 2016 by igorpadykov

Hi

Occasional the PCIe Link is not coming up after a SoftReset (Watchdog is generating a System Reset SRS=0).

 

Measurements made on PCIe Reset, Clock, RX and TX indicated that there is no output signal on the TX Pins on the i.MX6DL after releasing the Reset. POR doesn’t show this erroneous behavior.

 

After adding an initialization of some REF_SSP_EN in GPR1 of the IOMUXC this phenomena disappeared.

 

Questions:

- does a technical note exist which describes how to initialize PCIe properly?

- are there any known bugs?

 

Best regards

Moritz

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