External clock on RGMII_TX_CTL possible for RMII?

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External clock on RGMII_TX_CTL possible for RMII?

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MagnusNilsson
Contributor II

I have a custom IMXDL board with a KSZ8863 switch.

According to MDIO the switch is fine, but RMII is dead silent.

Both IMXDL and PHY are clocked by external clock.

I would like to confirm that it is indeed possible to use RGMII_TX_CTL to clock RMII from an external clock?

The HW dev. guide (IMX6DQ6SDLHDG) is a bit light on detail regarding RGMII_TX_CTL, as GPIO_16 is the recommended external clock sink.

If RGMII_TX_CTL is a valid clock sink for RMII, it's a SW issue and I'd much appreciate any sample code.

I'm trying to get ethernet running on uboot, for a start.

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Magnus

yes this signal also can be used for RMII as described in

IMX6SDLRM Table 23-1. ENET External Signals

There are some RMII examples below

RMII on i.MX6 (L3.0.35_4.1.0)

Re: RMII interface on i.MX6 Solo

Best regards

igor

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igorpadykov
NXP TechSupport
NXP TechSupport

Hi Magnus

yes this signal also can be used for RMII as described in

IMX6SDLRM Table 23-1. ENET External Signals

There are some RMII examples below

RMII on i.MX6 (L3.0.35_4.1.0)

Re: RMII interface on i.MX6 Solo

Best regards

igor

-----------------------------------------------------------------------------------------------------------------------

Note: If this post answers your question, please click the Correct Answer button. Thank you!

-----------------------------------------------------------------------------------------------------------------------

View solution in original post

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