i.MX ProcessorsのトピックRGMII ENET_REF_CLK input

RGMII ENET_REF_CLK input

frankambrosius — Tue, 25 Nov 2014 14:22:04 GMT

We will connect a 125MHz external clock to the ENET_REF_CLK pad.

Does this clock have to be up and running before or after we power-up the i.MX6?

Best regards,

Frank

Re: RGMII ENET_REF_CLK input

igorpadykov — Wed, 26 Nov 2014 01:04:19 GMT

Hi Frank

clock should be provided to i.MX after its power-up, in general

it is not allowed to provide signals to unpowered processor.

Best regards

igor

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Re: RGMII ENET_REF_CLK input

frankambrosius — Wed, 26 Nov 2014 07:16:50 GMT

Hi Igor,

Thanks for the answer.

Are there any restrictions on before what moment the clock should be up.

Of course it has to be up before actual RGMII communication can start. Is it a problem if it comes up while or after initializing the RGMII interface (while booting the imx)?

Best regards,

Frank

Re: RGMII ENET_REF_CLK input

igorpadykov — Wed, 26 Nov 2014 07:43:01 GMT

Hi Frank

clock can be provided at any time after power-up sequence.

~igor