If you use an ST discovery or evaluation board, the support of external memories is "automatic"
In the X-CUBE-AI window, click on the advanced settings wheel on the top right, it will show you the available memories on the board
Click on Use external RAM, choose the available RAM in the combo box then click on Use Activation buffer and just verify that the address is at the beginning of the external RAM.
When you generate the code the BSP code to initialize correctly the external RAM will be included automatically in the generated code.
If you have a non ST board with external RAM, you can do the same procedure in X-CUBE-AI but in that case choose Custom and set the address to use. It is up to you to then add the code to configure the access to the external RAM (using OctoSPI of FMC) and memory map the external RAM so that X-CUBE-AI code can directly read and write to it using a regular address.
Chapter "4.4 Advanced settings" of UM2526 Getting started with X-CUBE-AI Expansion Package for Artificial Intelligence (AI) gives you some screenshot on how to setup external memories for X-CUBE-AI
Regards
Daniel
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