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AM6442: BOOTMODE Review for AM6442

Jack
Mastermind 9315 points
Part Number: AM6442


Hi 

There's question that customer wants to clarify. Please let us know the BOOTMODE configuration is sufficient for their requirements below.

- PLL Reference Clock : 25MHz
- Boot Device Selection : QSPI
- Primary Boot Media : QSPI
- Backup Boot Mode : USB
- Backup Boot Media : USB

Thanks.

  • +1
    TI__Guru* 88430 points

    Jack, although BOOTMODE[15:14] are reserved, they should not be left floating.  Install a pull down on these two signals

    The BOOTMODE is setup as QSPI for primary boot, CS0, and internal pad loopback.  Ensure that LBCLKO is a no connect on the board. 

    The backup bootmode is setup for USB device mode (DFU).  AM64x would be in peripheral mode.  In the diagram, I'm not sure if the customer wants host or peripheral mode.  If they want to boot from something like a flash drive, they would need to set BOOTMODE[13] to 1 for host mode (MSC boot)

    Regards,

    James

  • 0 in reply to JJD
    Mastermind 9315 points

    Hi JJD

    Thanks for your kind answer.

  • 0 in reply to JJD
    Mastermind 9315 points

    Hi JJD

    I found the relevant info from Table-4-24. 

    To setup USB mode, Should I config both 8 and 13?

    Thanks.

  • +1 in reply to Jack
    TI__Guru* 88430 points

    No.  Bit 8 is used when using USB for primary boot mode, and bit 13 is used when USB is used for backup boot mode.  In your case you would use bit 13.  Bit 8 in your case is used to select the clock for QSPI mode (see the table for QSPI Boot Configuration fields)

    Regards,

    James

  • 0 in reply to JJD
    Mastermind 9315 points

    Hi JJD

    Thanks for clarification.