how to configure stm32l4r9i octospi for reliable hyperram operation

pratham090 · ‎2025-12-22

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

KDJEM.1 · ‎2025-12-23

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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KDJEM.1 · ‎2025-12-23

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

To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.