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AM625: Regarding AM6254

Premalatha Royappan
Intellectual 910 points
Part Number: AM625

We are using AM6254 in our design, We have few clarifications:

1, Do we need different external clock sources for main domain and MCU domain - If not, how are we achieving this MCU isolation from Main domain

·       Because in AM62x_TRM it is mentioned that " The Microcontroller Unit Domain (MCU Domain) is a “chip-in-a-chip” concept and it operates using separate
clock sources and resets."
2, Is it really mandatory to provide 32KHz crystal input to MPU since we are using external RTC
·       What exactly are the additional feature/benefits details?
3,What is the exact difference btw Primary boot Vs Backup mode. Is there any Boot mode preferential order/sequence available? 
  • 0
    TI__Guru 60955 points

    1) AM62x provides a several optional clock inputs, WKUP_LFOSC0, AUDIO_EXT_REFCLK[1:0], EXT_REFCLK1, and MCU_EXT_REFCLK0. You should search the device TRM for each clock input to understand which internal modules can be clocked form each of these optional clock inputs. Then you need to determine if your specific system implementation is able to use one of the internal clock references or requires a external clock.

    2) The internal 32k clock is generated from a integer divider of HFOSC operating frequency, which only supports 24 MHz , 25 MHz, or 26 MHz. For example, If HFOSC = 25 MHz, the internal 32k clock will be (25000000/95)/8= 32,894.7368 Hz or (25000000/96)/8= 32,552.0833 Hz. You may need to use WKUP_LFOSC0 if your application requires the internal 32k clock to be exactly 32,768 Hz.

    3) Backup boot mode is only executed if primary boot mode fails. The boot mode/sequence selected depends on your specific system requirements. Please refer to the Initialization chapter in the device TRM for more details.

    Regards,
    Paul