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STM32f107 and 25MHz  MCO out to Ethernet PHY LAN8742A

Question asked by arjun raj on Feb 13, 2018
Latest reply on Feb 15, 2018 by T J


I am planning to use a 25MHz crystal as HSE Xtal for STM32f107 and route the same 25MHz Clock as MCO out to drive the ethernet PHY Chip -LAN8742A.

From LAN8742A, 50MHz RMIIREFCLK is fed back to stm32f107 EMAC.


I want to know if there are any issues in doing so.


In Evaluation board, NUCLEO F207zG, they have connected seperate 25MHz crystal to the PHY Chip.


Looking for a quick response 


Thanks and regards

Arjun P Raj