ESP32 Forum

Hello all,

I would like to know if it is possible to use multiple sources of PSRAM to build more malloc-capable memory.

This could be, for example:
- An ESP32-S3R8 and an external ESP32-PSRAM64H tied to the SPI0/1 bus
- Two ESP32-PSRAM64H in parallel, tied to the SPI0/1 bus

I don't think so, you would have to be able to associate each memory mapped region to a different chip select. There are 128mb psram chips though.

But in the ESP32R8(V) example, there is only one external device. Or is a CS required for the SiP RAM too?

'External' in this sense means external to the ESP32S3 silicon die. The ESP32R8 QFN package has an ESP32S3 die in it with on top of that a separate PSRAM die, so it's still viewed as 'external' even if the PSRAM is in the same package as the ESP32S3.