Has someone succeeded extending RAM on the nRF53 series?

[cstches]

Hi, although there are many guides and stories about attaching the nordic to external storage NVM, there aren't infos about doing the same with RAM. 

I even found some threads recommending usage of cheaper SD-Cards, but this is crazy. I am talking about RAM here.  I understand NVMs can be misused for this, but this can not be considered for serious work, considering wearing out.  I am sure there are competitors offering chips able to extend their ram with SPI compatible PSRAM but I don't get why it may not be possible to achieve this with nordic chips. Any suggestions?

[Kenneth]

Hello,

It's not supported by design to extend the RAM, I would think main reason is that it would be very inefficient without some very large cache and high speed interface, because if the CPU need to use a variable you would end up to use very many clock cycles to fetch any data through an external QSPI interface.

I guess you can still use external memory if you just need a way to store, update and read external memory, but you will need to make the application manually use the serial interface to do this.

Kenneth

[AMarch01]

It would be fun to see an "nrf57" with M7 and external SRAM interface, but I can't think of use case for such a monster... unless Bluetooth in the 6Ghz range can bring about some need.