ETHERNET RMII configuration in STM32H745I-DISCO (MB1381-H745XI-B02).

[vaun]

Hello ST Community,
I M USING STM32H745I-DISCO (MB1381-H745XI-B02), WHICH COME DEFAULT MII MODE, TO CONFIGURE IT ON RMII, WHAT CHANGES I HAVE TO DO IN HARDWARE, IOC. AS THIS BOARD HAVE ETHERNET IC LAN8742A-CZ-TR WHICH HAVE BOTH MII,RMII PROTOCOLS.
AS I HAVE SEEN SOME VIDEOS ON ETHERNET FOR DIFFERENT STM32 CONTROLLER IN RMII, I M NOT ABLE TO GET RESULT. 

I WANTED TO KNOW DO THIS BOARD CONFIGURE IN RMII, IF YES THEN TELL ME HOW I CAN DO.

HERE IS CONFIGURATION I HAVE DONE IN MY PROJECT.
 

PG11	ETH_TX_EN	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PG14	ETH_TXD1	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PG13	ETH_TXD0	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PC5	ETH_RXD1	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PC4	ETH_RXD0	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PA1	ETH_REF_CLK	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PA2	ETH_MDIO	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PC1	ETH_MDC	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true
PA7	ETH_CRS_DV	ARM Cortex-M7	n/a	Alternate Function Push Pull	No pull-up and no pull-down	Very High	n/a		true

[mƎALLEm]

Hello @vaun and welcome to the St community,

According to the board's schematic /page 5, the configuration is MII and not RMII:

[vaun]

thanks @mƎALLEm for your response, i have seen the schematic its was in MII mode, i m asking do this eval board can be configure in RMII or not , if not then what are the configuration to configure ethernet in RMII for custom PCB have stm32h745bit6 controller.

[mƎALLEm · Accepted solution]

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@vaun wrote:

 i m asking do this eval board can be configure in RMII or not , if not then what are the configuration to configure ethernet in RMII for custom PCB have stm32h745bit6 controller.

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No you can't configure the ETH on that board in RMII. You should configure it in MII as the board is hardwired in MII mode.