TDA2PXEVM: PHY_ALIVE signal with a switch between PHY and TDA2px

Part Number:TDA2PXEVM

Hello,

I am working with an ECU where PHY is connected using ENET 5 PORT SWITCH to TDA2px. In the design MDC and MDIO are not used.  But, Port switch is clocked with 25MHz OSC. Can the PHY be working without MDC and MDIO in this scenario? 

Regards,

Tejeswini