topic Re: Executing Program from SDRAM performance in i.MX Processors

Executing Program from SDRAM performance

rnicolls — Fri, 16 Dec 2022 21:34:51 GMT

Hi,

We'd like to copy our application from NOR flash and execute from the external SDRAM. My understanding is that the SDRAM controller is connected to a 32 bit bus, whereas the Serial NOR Flash is connected to a 64 bit bus. The result is reduced performance when executing instructions from the SDRAM. How poor will the performance be? We're using the IMXRT1176.

Thanks

Re: Executing Program from SDRAM performance

Omar_Anguiano — Wed, 21 Dec 2022 22:48:22 GMT

Hello
Hope you are well.

Yes, it is expected some reduced performance between SDRAM and Nor flash however this difference is not significant if you place text on SDRAM and data on DTCM.
I will attach an example of theoretical throughput on different RT11xx interfaces:

Best regards,
Omar