DP83867E: VDD two supply configuration

Part Number: DP83867E

Currently looking to modify a design that is running with 1v and 2.5v configuration.  We need to change to a 1v and 1.8v configuration, but its not clear if this is supported on the datasheet.  We need the rx and tx lines to our SOM to be 1.8 volts.  I see there is a 3 supply version that supports 1.8v for the io, but this would require copper changes for us.