ENET1_TX_CLK pin setting for RMII function of i.MX6ULL

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ENET1_TX_CLK pin setting for RMII function of i.MX6ULL

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yuuki
Contributor V

Dear all,

We want to use ENET1 as RMII function.
In this case, we have a question about pin setting of Reference Clock.

<Question>
When I use a reference clock for RMII, how should I set ENET1_TX_CLK?


There is a different description about ENET1_TX_CLK pad in Reference Manual.

IMX6ULLRM Rev. 0, 09/2016:
 - Table 23-1. ENET1 External Signals(P.950)

ENET1_TX_CLK.png

I seem that ENET1_TX_CLK pad is set to ALT1(ENET1_REF_CLK1).

However, in IOMUXC_SW_MUX_CTL_PAD_ENET1_TX_CLK description, ALT1 is UART7_CTS_B setting.

IMX6ULLRM Rev. 0, 09/2016:
 - 33.6.39 SW_MUX_CTL_PAD_ENET1_TX_CLK SW MUX Control Register (IOMUXC_SW_MUX_CTL_PAD_ENET1_TX_CLK) (P.1580)

IOMUX_SW_MUX_CTL_PAD_ENET1_TX_CLK.png
Here, I seem that ENET1_TX_CLK pad setting for ENET1_REF_CLK1 function is ALT4.


In addition, accoding to the schematic for RMII of MCIMX6ULL-EVK(CM) and PIN tool(V3.0.2) for MCIMX6ULL-EVK-REV-A,
ENET1_TX_CLK(F14) pin is used as ENET1_TX_CLK signal.

Schematic_for_RMII.png

Pintool_for_MX6ULL-EVK.png

I am confused.
About a reference clock for RMII, please tell me the right setting.

Best Regards,
Yuuki

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

ENET1_TX_CLK  is used as ENET1_REF_CLK1 (ALT4 mode) in the reference design..

Have a great day,
Yuri

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Yuri
NXP TechSupport
NXP TechSupport

Hello,

ENET1_TX_CLK  is used as ENET1_REF_CLK1 (ALT4 mode) in the reference design..

Have a great day,
Yuri

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

View solution in original post

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