We are using W5500 with external 25MHz clock. Clock input XI/CLKIN is connected to OSC_OUT of STM32F412 (ARM Cortex M4). Signal is stable, sinusoidal, voltage level about 400mVpp.
Everything seems to be working fine, but we need to confirm, is such connection within the electrical specifications of the W5500? What would be the minimum signal level expected on XI/CLKIN input?