can I use an external flash and RAM at the same time on STM32wb55

[Ajoub.1]

I'm trying to add an external FLASH and RAM to the STM32WB55, but he doesn't have an FMC or FSMC, and all resources a could find related to this subject use the FMC peripheral, there is any way to use the external RAM and FLASH in the same time?

should I use 1 QSPI for both of them?

[Tesla DeLorean · Accepted solution]

No.

You can only use one, the design is optimized for a QSPI NOR Flash, allows for execute-in-place.

What kind of FLASH/RAM resources does your application need?

[Ajoub.1]

hey, thank you for your reply

I'm looking for an extra 1 Mb of RAM and more than 4 Mb of flash.

what do you think is the solution?

I can optimize the flash because I will use it for a GUI product.

[Tesla DeLorean]

Mb bit

MB Byte

What do you need 1MB of RAM for?

Perhaps look to a display/controller with it's own on-board frame buffer memory, and which you can communicate with via SPI.

Consider pairing with another MCU with more flash, ram, and capabilities.

[Ajoub.1]

I'm already using an LCD with it one frame buffer

I want this size of RAM for future updates and the RTOS.

I don't want to update the hardware in the future.

But anyway, I will go with the available RAM in the MCU.

Thank you for the information.​