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RTOS/AM6548: Enable PCIe REFCLK0 Output

Dominik Matt
Prodigy 21 points
Part Number: AM6548

Tool/software: TI-RTOS

Dear TI Support Team,

we use the AM6548 Device as PCIe Root Complex.

We would like to use the REFCLK0P/N (Pin AF10/AF9) Clock Output for the PCIe Endpoint.
It seems that the Clock Output is disable by default.

How can we enable this Clock Output?

Regards,
Dominik

  • 0
    TI__Guru* 95265 points
    Hi,

    This is controlled by CTRLMMR_SERDES0_REFCLK_SEL, see the TRM 5.1.3.4.168 CTRLMMR_SERDES0_REFCLK_SEL Register (Offset = 8020h) [reset = 0h]. You can use a value 2 or 3 to get a 100MHz reference clock and this goes to REFCLK0P/N pins.

    Regards, Eric