using GPIO_16 pin as reference clock in RGMII

JHY — Fri, 25 Jul 2014 06:37:35 GMT

I found a below sentance

"In RGMII Mode, only the pin "ENET_REF_CLK" could used as 125M reference clock input."

In RGMII Mode, I would like to use GPIO_16 pin as 125M reference clock input supplied from external device.

is it possible or impossible ?

Re: using GPIO_16 pin as reference clock in RGMII

Yuri — Fri, 25 Jul 2014 07:01:06 GMT

GPIO_16 is intended for RMII reference clock; ENET_REF_CLK is intended for

RGMII reference clock. Next, ENET_REF_CLK is input clock, that is - an external

source should be applied. The problem if internal clocks may be used for the

RGMII were discussed in community threads below, and as a resume :

"i.mx6 requires a Reference clock externally on ENET_REF_CLK pad and without

that it could not work / generate the TX CLK."

https://community.freescale.com/message/308970#308970

https://community.freescale.com/message/306197#306197

Have a great day,
Yuri

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topic Re: using GPIO_16 pin as reference clock in RGMII in i.MX Processors

using GPIO_16 pin as reference clock in RGMII

Re: using GPIO_16 pin as reference clock in RGMII