Espressif ESP32 Technical Reference Manual page 269

10 Ethernet Media Access Controller (MAC)
31
0 0 0 0 0 0 0
MII_DATA This field contains the 16-bit data value read from the PHY after a Management Read
operation or the 16-bit data value to be written to the PHY before a Management Write operation.
(R/W)
Espressif Systems
Register 10.18. EMACMIIDATA_REG (0x1014)
0 0 0 0 0 0 0 0
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16 15
0 0x00000
269
0
Reset
ESP32 TRM (Version 5.2)