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ENET1_TX_CLK pin setting for RMII function of i.MX6ULL

Question asked by yuuki on Jul 12, 2017
Latest reply on Jul 13, 2017 by Yuri Muhin

Dear all,


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


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)

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)

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.


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


Best Regards,