POR_B and 24MHz timing provision .

[takashitakahash]

Hi community .

Our customer has below question.

The described POR_B and 24MHz to P.95 of "IMX6DQ6SDLHDG rev.1".

"During initial power on while asserting the POR_B reset signal, ensure that 24 MHz clock is active before releasing POR_B."

There are before the cancellation of the POR_B ensures 24 MHz clock is active .

RTC clock (32.768 kHz) have to POR_B unlock provided  spec ?

Or, if the timing provisions of 24MHz and POR_B release are protected, do not be a problem even for the RTC.

[igorpadykov · Accepted solution]

Hi Takashi

32.768 kHz crystal does not matter as 32 kHz clock will automatically switch

to the internal ring oscillator. 24MHz is necessary for normal operation

of PLLs and arm core.

Best regards

igor

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