Using QSPI PSRAM with a STM32-H753 is that possible?

Question

Hello,I am in the process of designing a product which is based on the STM32-H753 and requires P/SRAM.However, I'm concerned the H753 might not support on PSRAM with QSPI, I need the PSRAM for write/read.I haven't found any application notes or examples from ST showing connection QSPI PSRAM into the STM32  only for FMC or OCTOSPI Flash.Has anyone successfully used QSPI PSRAM with STM32H7 ?Are the specific requirements or limitation I should be aware of ?(attached reference images for context):

AScha.3 · Answer

Hi,The STM32H753 microcontroller features a Quad-SPI (QSPI) memory interface designed specifically for Single, Dual, or Quad-SPI flash memories. This interface supports up to 256 Mbytes of external flash memory and can operate in direct, polling, or memory-mapped modes. However, the official documentation does not mention support for PSRAM (Pseudo-Static RAM) or other non-flash memories via the QSPI interface. The QSPI is intended for flash memory only, and there is no indication that it can be used for PSRAM or RAM chips.+For connecting PSRAM to the STM32H753, the recommended interface is the Flexible Memory Controller (FMC). The FMC is designed to support static-memory mapped devices, including PSRAM, and can handle up to 4 memory banks. It offers features such as independent chip select and configuration for each bank, and supports 8-, 16-, and 32-bit data bus widths. This makes the FMC the appropriate choice for interfacing PSRAM with the STM32H753.+Maybe other idea: look at the H7S3 /7 series with xspi :

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