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AM625: external and internal spread spectrum oscillator support

Mithlesh Chandrakar
Prodigy 10 points
Part Number: AM625

Tool/software:

1. Do AM62x processors support external clock generator or do they support ONLY crystal oscillator?

2. If external clock generator is supported, does it support SS oscillator also? I have a problem with USB Device mode communication when I use SiT9005AC-13-18NH25.000000 as oscillator. Other peripherals like LPDDR4, SD card interface and eMMC flash work in general.

3.  Based on this link (https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1358154/am625-pll-spread-spectrum-modulation), internal SS feature is not supported in AM62x devices. Is it still correct or is it supported now?

  • +1
    TI__Guru 62855 points

    1) Yes. You can use a 1.8V LVCMOS clock source rather than a crystal circuit. However, the current datasheet does not define the MCU_OSC0 LVCMOS Digital Clock Source Requirements. We will be adding these requirements to the next revision of the datasheet. For now, please refer to the "MCU_OSC0 LVCMOS Digital Clock Source" section of the AM62Dx or AM62Px datasheets. The requirements for AM62x will be the same.

    2) An external 1.8V LVCMOS source is supported, but not a Spread Spectrum source. As mentioned above, please follow the requirements defined in the "MCU_OSC0 LVCMOS Digital Clock Source" section of the AM62Dx or AM62Px datasheets.

    3) That is correct. SSC is not currently supported on AM62x. We may support SSC on the PLL that sources the DSS peripheral in the future, but there are no plans to support SSC for any other PLLs.

    Regards,
    Paul

  • 0 in reply to peaves
    Prodigy 10 points

    Thank you for quick and clear response.