MDIO appears to sample data on falling edge when decoding messages from PHY, which does not work at higher clock rates.

[Marcus10110]

From Wikipedia:
When the PHY drives the MDIO line, the PHY has to provide the MDIO signal between 0 and 300 ns after the rising edge of the clock.[1] Hence, with a minimum clock period of 400 ns (2.5 MHz maximum clock rate) the MAC can safely sample MDIO during the second half of the low cycle of the clock.

It sounds like if we depend on sampling on the falling edge, we might be sampling too soon if the half-period time is less than 300ns. The analyzer should handle this and ensure it's samples after 300ns.

This is based on user feedback.