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[FAQ] AM62x McSPI D0 and D1 direction in SPI bootmode

Tony Tang
Mastermind 27071 points

I knew D0 and D1 are configurable as MOSI and MISO, but when in SPI bootmode, which pin of D0 and D1 is MISO and MOSI? is it configurable in SPI boot mode?

  • +1
    TI__Guru* 75990 points

    Tony, D0 is MISO, and D1 is MOSI.  It is not configurable

    Regards,

    James

  • 0 in reply to JJD
    TI__Mastermind 27071 points

    James,

    seems you made mistake, on AM62-SK set boot mode to SPI , the config register shows D0 as MOSI.

    spi config register:

    Register description is not clear in AM62x TRM:

    From AM335x TRM, detail description as below:

    Boot mode register set tp SPI boot.

  • 0 in reply to Tony Tang
    TI__Guru* 75990 points

    Hi Tony, you are correct i had this backwards

    D0 is MOSI, DQ is MISO

    However, the McSPI module doesn't perform boot.  The OSPI module performs boot, even in SPI mode.  The register that dictates the data direction is OSPI_DEV_INSTR_RD_CONFIG_REG.DATA_XFER_TYPE_EXT_MODE_FLD, which the ROM will set to 0x0 for SPI mode.

    I will get this clarified in the documentation

    Regards,

    James

  • 0 in reply to JJD
    TI__Mastermind 27071 points
    JJD said:
    Tony, D0 is MISO, and D1 is MOSI.  It is not configurable

    James, do you mean on AM62x, DO/D1 direction is not configurable. 

    We found the DPE0/1 doesn't effect. so want to double confirm.

  • 0 in reply to Tony Tang
    TI__Guru* 75990 points

    Tony, it is not configurable for boot.  The ROM chooses D0 MOSI, D1 MISO and it cannot be changed when booting from OSPI boot.  However, in your application, you can change the configuration for OSPI (configured in SPI mode) or McSPI if necessary. 

    What do you mean "DPE0/1 doesn't effect"?

    Regards,

    james