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DP83867IR: Change PHY MDIO Address via register?

Part Number: DP83867IR

Is it possible to change the PHY address of the DP83867 PHY by writing its registers?  

I have PHY strapped for address 0, but would like to change it after bootup.  I've looked through the datasheet and have not found a register to change it.  The register which shows the strapped address is read only.  The part is so capable that I expected it would allow this.  Am I wrong?  I'd appreciate if anyone can point out a way.