topic Re: Arm PLL frequency configuration in i.MX Processors

Arm PLL frequency configuration

n_po — Wed, 30 Jan 2019 00:04:07 GMT

Apologies if this has been asked previously.

There are 3 arm clock frequencies listed in the datasheet according to the part number:

Arm Cortex-A7 Frequency	$$
528 MHz	05
792 MHz	08
900 MHz	09

I would like to request for your expert opinion if there are consequences/issues (perhaps on the reliability of the arm execution, chip life) if I don't configure the arm clock as per above frequencies? Any issues if configured to be slower or faster than the frequencies above?

Re: Arm PLL frequency configuration

igorpadykov — Wed, 30 Jan 2019 23:27:10 GMT

Hi Nigel

operation above max. frequency defined in datasheet is not guaranteed, for below

there are no restrictions. One can look at datasheets for particular part, for i.MX6UL

it is below link

i.MX 6UltraLite Applications Processor | Single Arm® Cortex®-A7 @ 696 MHz |NXP

Reliability is described in AN1598 i.MX 6UltraLite Product Usage Lifetime

https://www.nxp.com/docs/en/application-note/AN5198.pdf

The same documents can be found on appropriate i.MX product pages.

Best regards
igor
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Re: Arm PLL frequency configuration

n_po — Thu, 31 Jan 2019 02:34:20 GMT

Thanks Igor!