Kinetis MicrocontrollersのトピックEthernet clock configuration

Ethernet clock configuration

marcoantoniodeo — Mon, 25 Feb 2019 12:07:30 GMT

Hi all,

I have an year long project using KDS_v3 , KSDK_1.3.0 and Processor Expert. I know support ended for PE, but I want to ask a few questions:

How is the minimum clock frequency configuration for the Ethernet work, in the means of mode, core clock, flash etc?
Is the external clock reference sufficient to be the exclusive source for clock?

My hardware specs:

MK64FN1M0VLL12 (QFP100)

KSZ8081 (QFP32)

Thank you.

Marco

Re: Ethernet clock configuration

FelipeGarcia — Wed, 27 Feb 2019 18:56:47 GMT

Hi Marco,

Please refer to the reference manual in chapter 5.7.7

In this case the slowest clock source you can use is an external clock in OSCERCLK or ENET_1588_CLKIN that can give you up to 50 MHz. Otherwise you will have to use the internal source clock (Core/System clock, MCG PLL/FLL clock) that work at 120 MHz.

Is the external clock reference sufficient to be the exclusive source for clock?

Yes, just keep in mind that the clock period should be an integer number of nanoseconds.

Have a great day,
Felipe

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Re: Ethernet clock configuration

marcoantoniodeo — Thu, 28 Feb 2019 17:21:27 GMT

Hi Felipe,

I´ve read that page but to be true your explanation makes more sense to me know.

Thank you

Marco