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pratham090
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December 22, 2025
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how to configure stm32l4r9i octospi for reliable hyperram operation

  • December 22, 2025
  • 1 reply
  • 72 views

Hi, I have stm32l4ri-eval how do i configure the octospi interface to use the issi hyperam which is onboard.

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    Best answer by KDJEM.1

    Hello @pratham090 ;

     

    As mentioned in the User Manual Table 44. The main board does not support Octo-SPI operation with PSRAM. No
    workaround available. Refer to STM32L4Rxxx and STM32L4Sxxx device errata sheet.

    For that in STM32L4R9I-EVAL B02, the  ISSI IS66WVH8M8BLL-100BLI changed into ‘Not fitted'

     

    Thank you.

    Kaouthar

    1 reply

    K
    KDJEM.1Answer
    Technical Moderator
    December 23, 2025

    Hello @pratham090 ;

     

    As mentioned in the User Manual Table 44. The main board does not support Octo-SPI operation with PSRAM. No
    workaround available. Refer to STM32L4Rxxx and STM32L4Sxxx device errata sheet.

    For that in STM32L4R9I-EVAL B02, the  ISSI IS66WVH8M8BLL-100BLI changed into ‘Not fitted'

     

    Thank you.

    Kaouthar

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