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RTOS/TM4C1294NCZAD: TI PHY question

Part Number: TM4C1294NCZAD

Tool/software: TI-RTOS

In EMACSnow.c, why is PHY_PHYS_ADDR defined as a '1'? This #define is used to set up interrupts and interrupt processing on the phy, but as I understand it, phy address '1' would be external to the cpu. Other operations in this file use a '0' for the internal phy. Can you explain this confusion?