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AM69: MCU_BOOTMODE pin settings

Daisuke Maeda
Guru 19895 points
Part Number: AM69

How to set MCU[7].OVRD pin in MCU_BOOTMODE pins?

The MCU[7].OVRD pin is described in TRM as follows.

Table 4-2. MCU_BOOTMODE Pin Mapping
"(2) Pull MCU 7 to 0 on GP devices."

Should the MCU[7].OVRD pin be pulled to '1' on Secure devices?

Should the MCU[7].OVRD pin be pulled to '0' on Secure devices if security features such as secure boot are not used?

Best regards,

Daisuke

  • 0
    Guru 19895 points

    Dear TI support team,

    Thank you for your support. Our customer is waiting for your reply.

    Please give me an answer as soon as possible. Your prompt reply would be appreciated.

    Best regards,

    Daisuke

  • 0 in reply to Daisuke Maeda
    Guru 19895 points

    Hi,

    Thank you for your support. Our customer is waiting for your reply.

    I checked the J784S4 EVMs.

    On both SK-AM69 and J784S4XG01EVM, WKUP_GPIO0_15 (MCU_BOOTMODE07) is pulled low.

    XJ784S45AALY on SK-AM69 is a high security device (device type is '5').
    XJ784S4GAALY on J784S4XG01EVM is a general purpose device (device type is 'G').

    Daisuke Maeda said:

    Should the MCU[7].OVRD pin be pulled to '1' on Secure devices?

    Should the MCU[7].OVRD pin be pulled to '0' on Secure devices if security features such as secure boot are not used?

    Should the MCU_BOOTMODE07 (MCU[7].OVRD) pin be pulled high if security features are used on Secure devices?

    Please give me an answer as soon as possible. Your prompt reply would be appreciated.

    Best regards,

    Daisuke

  • +1 in reply to Daisuke Maeda
    TI__Mastermind 41640 points

    Most designs should pull OVRD pin to GND ('0') for both GP and secure devices.  OVRD allows some of the boot pins to be over-written with values stored in eFUSE values or external EEPROM.   For most boot pins, we recommend providing both pull-up and pull-down options for development systems (allows flexibility). For this bit - certainly default to pull-down.

  • 0 in reply to Robert Eschler
    Guru 19895 points

    Hi Robert Eschler-san,

    Thank you for your reply.

    Robert Eschler said:
    OVRD allows some of the boot pins to be over-written with values stored in eFUSE values or external EEPROM. 

    Is there more information about how to use OVRD?

    Robert Eschler said:
    For most boot pins, we recommend providing both pull-up and pull-down options for development systems (allows flexibility).

    For OVRD, is it recommended providing both pull-up and pull-down options for development systems?

    Best regards,

    Daisuke

  • 0 in reply to Daisuke Maeda
    TI__Mastermind 41640 points

    For development systems, it is recommended to provide both pull-up and pull-down options (for flexibility).  Again - I recommend this bit be pulled down by default (do not populate pull-up resistor).