MCX MicrocontrollersのトピックRe: MCXA153 Low Power Cache Controller (LPCAC)

MCXA153 Low Power Cache Controller (LPCAC)

seanwu — Wed, 06 Nov 2024 08:20:09 GMT

Dear sir,

Is there any document or example of Low Power Cache Controller (LPCAC)?

How to use this feature to add GPIO raise/fall performance?

Thanks.

BR,

Sean Wu

Re: MCXA153 Low Power Cache Controller (LPCAC)

ZhangJennie — Wed, 06 Nov 2024 09:17:01 GMT

Hi seanwu,

The LPCAC is disabled by default. For best performance, NXP recommends enabling it by clearing SYSCON->LPCAC_CTRL[DIS_LPCAC].

When enable LPCAC, Performance of code running in Flash or FlexSPI Flash matches RAM performance because of LPCAC

This AN includes LPCAC usage. Enable/DIsable LPCAC to test MCX performance.

https://docs.nxp.com/bundle/AN14139/page/topics/mcx_n-series_architecture_overview.html

MCXA153 reference manual also introduces the low power cache controller control method.

You could refer it to test your IO performance. For more about IO performance, please refer your other thread “MCXA153 GPIO rise/fall time performance”

Hope this helps,

Jun Zhang

Re: MCXA153 Low Power Cache Controller (LPCAC)

seanwu — Wed, 06 Nov 2024 09:28:49 GMT

Dear @ZhangJennie ,

In gpio_led_output example, LPCAC is enabled in SystemInit(); So, after reset LPCAC is enabled.

But the performance is not good.

Thanks.

BR,

Sean Wu

Re: MCXA153 Low Power Cache Controller (LPCAC)

ZhangJennie — Thu, 07 Nov 2024 03:13:09 GMT

Hello seanwu,

When code is running in Flash, enabling LPCAC will improve the performance as same as code is running in RAM. We have measured it with coremark.

However, if your GPIO performance doesn't meet your expectation, normally it's not due to LPCAC, but specific peripheral. We suggest you checking parasitic capacitance on IO pin. For more information on this topic, please refer and discuss under https://community.nxp.com/t5/MCX-Microcontrollers/MCXA153-GPIO-rise-fall-time-performance/td-p/1988501

Hope this helps,

Jun Zhang

Re: MCXA153 Low Power Cache Controller (LPCAC)

seanwu — Fri, 08 Nov 2024 01:32:26 GMT

Dear @ZhangJennie ,

Thanks for your reply.

May I double check with you that if LPCAC is enabled by default in SystemInit(); after reset?

Thanks.

BR,

Sean Wu

Re: MCXA153 Low Power Cache Controller (LPCAC)

ZhangJennie — Sun, 10 Nov 2024 12:25:10 GMT

Thanks. The new version of SDK should enable LPCAC in initialization code.

You said the performace is not good. Could you specify how did you test the performance? Do you test coremark? are your test on internal Flash or external?

Re: MCXA153 Low Power Cache Controller (LPCAC)

seanwu — Mon, 11 Nov 2024 01:07:58 GMT

Dear @ZhangJennie ,

I am using MCXA153 gpio_led_output example in SDK_2_14_2_FRDM-MCXA153, and testing on FRDM-MCXA153. AI add a gpio3_6 to toggle, and measure it's raising time. Default is using internal flash.

Re: MCXA153 Low Power Cache Controller (LPCAC)

ZhangJennie — Tue, 12 Nov 2024 02:28:56 GMT

if your GPIO performance doesn't meet your expectation, normally it's not due to LPCAC, but specific peripheral. We suggest you checking parasitic capacitance on IO pin. For more information on this topic, please refer and discuss under https://community.nxp.com/t5/MCX-Microcontrollers/MCXA153-GPIO-rise-fall-time-performance/td-p/19885...

Thanks,

Jun Zhang

Re: MCXA153 Low Power Cache Controller (LPCAC)

seanwu — Tue, 12 Nov 2024 05:46:54 GMT

Dear @ZhangJennie ,

Thanks for your reply.

BR,
Sean Wu