Network Controller FEM Control

When utilizing the 2-wire FEM control within the Network core, is it possible to have a 3rd GPIO output slaved to these two FEM control outputs and preserve timing?  That is -- There are "TXEN" and "RXEN" lines for the 2-wire interface.  I would like to have a 3rd GPIO designated that would behave exactly as the inverse of RXEN.  Is there a way to manipulate the 2-wire FEM control code to achieve this?

Thanks

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