Looking For External Memory Benchmark on STM32F469/79 using FMC or QSPI interface

[STFan]

Hi,

Anyone know where I can find memory benchmarks on using the different type of external memories on the STM32F469/79 ?

How slower is the PSRAM on FMC or dual Quad SPI compare to internal SRAM ?

thanks

[Tesla DeLorean]

Wouldn't you just test it?

The F4 is an uncached architecture, so external interfaces are going to slam access speed.

SDRAM was 6x slow than internal SRAM, as I recall.

I haven't tried QSPI NOR Flash, but would hazard between 2 and 4x slower than Internal FLASH. That I could read Dual-Quad QPI at approaching 90 MBps in a continuous / large-linear sense, doing nothing else, perhaps loading executable code into Internal SRAM in some mapped/banked scheme.

Some pressing reason not to be using a CM7 device in 2024?