STM32H735 RMII_REF_CLK 50MHz

[PUN CHEE HUEY]

Hi All,

I have a 50MHz clock with 1Vpp and the MAC is not working. The only information I have from the RM and datasheet is this is a digital input pin and never mentioned about the voltage level. Please help what is the clock pulse VPP for RMII reference clock pin ?

Thank you in advance.

[TDK]

This is a digital input, so it will need to respect the digital input levels. Generally, a low of 0.3 VDD or less and a high of 0.7 VDD or more. It's unlikely a 1 Vpp signal will satisfy both of these.