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AM2432: Boot Questions

Mari Tsunoda
Expert 5726 points
Part Number: AM2432


Hi Team,

My customer has a few questions regarding boot.

  1. In section 4.4.1.1 OSPI Boot Table 4-6. OSPI Configuration Fields, it says Iclock source external/internal under Description. What is this Iclock, and how should they choose between internal and external? Also, if internal,  what clock is this clock loopback from? If external, which pin is it input from?
  2. For SPI boot, QSPI boot, how is SPI clock frequency decided?
  3. In Section 4.4.1.3 QSPI Boot Table 4-11. QSPI Port 0 Pin Usage, OSPI0_RESET_OUT0, OSPI0_RESET_OUT1 are not listed. Do they need to be connected?
  4. What is OSPI0_LBCLK? In the datasheet section 6.3.18 OSPI, Table 6-62. OSPI0 Signal Descriptions it says that it is a IO signal, but there is no other indication elsewhere on the datasheet. What is this signal for and how are they supposed to configure it?

Best regards,

Mari Tsunoda

  • 0
    TI__Mastermind 24733 points

    Hello Mari,

    1) Iclock = Interface Clock and will be dependent on the flash device used and associated system configuration.

    The information regarding QSPI loopback clock can be found in Datasheet Section 9.3) Peripheral- and Interface-Specific Design Information. The diagrams uses the "MCU_OSPI*" nomenclature at the moment but this will be fixed in the next release.

    2) The interface clock operating frequency is fixed for these boot modes based on design constraints.

    3) The RESET_OUT0 and RESET_OUT1 are special pins that allow SW to reset to flash memory device outside of the default PORz/Boot flow, so they are not required.

    4) See details from answer 1. Screenshots from datasheet section 9.3.2 included below for quick reference.

    Best Regards,

    Zackary Fleenor