i.MX RT1060 EVK Ethernet RMII Clock (Input Mode)

[accatpaliz]

I am using RMII Interface to communicate with phy ic (lan8720).

enet example in sdk generates clock for enet phy (project: evkmimxrt1060_enet_txrx_transfer)

it is the code used in sdk for clock initialization:

void BOARD_InitModuleClock(void)
{
/* Set 50MHz output clock required by PHY. */
const clock_enet_pll_config_t config = {.enableClkOutput = true, .loopDivider = 1};
CLOCK_InitEnetPll(&config);

/* Output 50M clock to PHY. */
IOMUXC_EnableMode(IOMUXC_GPR, kIOMUXC_GPR_ENET1TxClkOutputDir, true);
}

now i want to use external 50MHz oscillator and share it between ethernet phy and mac.

i guess i need to change 

kIOMUXC_GPR_ENET1TxClkOutputDir   to   kIOMUXC_GPR_ENET1RefClkMode

but is it enough? or should i make other changes to use clock as mac input?

is there any example using clock as input i can referred to? (preferably with my lan8720 module or somewhat like it)

[jeremyzhou · Accepted solution]

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) But is it enough? or should i make other changes to use clock as mac input?
-- Yes, further, it's unnecessary to configure the ref_enetpll actually.
2) Is there any example using clock as input i can referred to? (preferably with my lan8720 module or somewhat like it)
-- No.
Have a great day,
TIC

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