topic Re: Enabling Data Cache in MCX Microcontrollers

Enabling Data Cache

ge0rgeth0mas — Mon, 24 Feb 2025 07:10:12 GMT

Hi,

I'm testing the inference time and performance of TFLite AI Models on the NXP FRDM-MCXN947 MCUs. While I'm getting good performance using the NPU, I'm getting comparably slow inference times when not using it. I have been able to reduce inference time for other MCUs by enabling the Data Cache. I would like to know how to enable D-Cache on the NXP MCUs. Any other performance boost strategies are also welcome.

Re: Enabling Data Cache

Harry_Zhang — Tue, 25 Feb 2025 10:00:26 GMT

Hi @ge0rgeth0mas

You can refer to the Chapter 5 in MCX Nx4x Reference Manual.

Regarding cache related APIs.

You can refer to the fsl_cache_lpcac.h in MCXN947 SDK.

Harry

Re: Enabling Data Cache

ge0rgeth0mas — Tue, 25 Feb 2025 12:16:25 GMT

Hi Harry,

Could CACHE64 be data cache and LPCAC be Instruction cache?

Re: Enabling Data Cache

ge0rgeth0mas — Tue, 25 Feb 2025 12:19:24 GMT

Hi Harry,
I was going through the reference manual and SDK drivers as you mentioned:
I noticed theres is
* fsl_cach_lpcac.h which contains L1CACHE_EnableCodeCache()
and
* fsl_cache.h which contains CACHE64_EnableCache(CACHE64_CTRL_Type *base)

Could CACHE64 be data cache and LPCAC be Instruction cache?

Re: Enabling Data Cache

Trappka — Wed, 26 Feb 2025 07:47:21 GMT

It's great to see you exploring TFLite AI Models on the NXP FRDM-MCXN947! Enabling D-Cache can indeed enhance performance significantly. You might also look into optimizing your model size or quantizing your models for better efficiency. Speaking of performance, have you tried integrating it with gaming applications like the Snow Rider 3D game? It could be a fun way to test the capabilities of your setup!

Re: Enabling Data Cache

Harry_Zhang — Thu, 27 Feb 2025 03:19:55 GMT

Hi @ge0rgeth0mas

The CACHE64 module is used to cache FlexSPI accesses.

Based on your need, you just need to enable lpcache.

Harry

Re: Enabling Data Cache

Slopegame — Wed, 19 Mar 2025 06:55:48 GMT

Interesting! Have you experimented with compiler optimization flags? Often, bumping up optimization (e.g., -O3) can significantly speed up code when the NPU isn't active. Also, regarding D-Cache, check the SDK documentation for CACHE_Enable or similar functions, specifically for the MCXN947. Remember optimizing often comes down to a balancing act like in Slope Game, optimizing code versus hardware limitations for top performance. Good luck!

Re: Enabling Data Cache

Selina_Robert — Thu, 11 Dec 2025 11:05:18 GMT

Enabling data cache can really speed up workflows and reduce repetitive processing. For those looking to plan effectively, the Persona fusion strategy offers a clear way to anticipate outcomes and optimize results. It’s fascinating how combining the right elements can lead to unexpected efficiencies. This approach definitely makes managing complex data much more approachable.

Re: Enabling Data Cache

RyanTyler — Thu, 05 Feb 2026 03:23:06 GMT

That's fascinating work! I've dabbled in similar optimization challenges before. Have you explored different quantization techniques for your TFLite models? Sometimes, even small tweaks there can make a difference when the NPU isn't engaged. Speaking of fast-paced action, it reminds me of playing Basketball Stars! It demands quick reflexes and strategy, just like optimizing AI. You might find it a fun distraction when you need a break from the coding.

Re: Enabling Data Cache

CoreyFranklin — Fri, 20 Mar 2026 08:17:04 GMT

That's interesting work on the FRDM-MCXN947! It's great you're exploring different performance optimizations. I haven't worked with that specific MCU, but data cache enabling definitely makes a difference in many cases. You might find some helpful insights from communities focused on embedded development, or perhaps even those discussing similar optimization challenges within the context of games like, ironically enough, Suika Game! Sometimes the approaches to efficiency in game development translate unexpectedly well. Good luck with your project!