Hi,
We need a buffer for MDC/MDIO ,because one MDC/MDIO of MAC connected to two PHY. Note: buffer is for automative AEC Q level.
MDC max frequency is 12.5MHz, MDC to MDIO (output) delay time max is 20ns,MDIO(input) to MDC setup time min is 10ns, MDIO(input) to MDC hold time min is 10ns.
Thanks a lot