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How can I find the PHY address of LAN8720

Question asked by kashuba.dmitry on Nov 8, 2016
Latest reply on Nov 10, 2016 by gryo
I have STM32F4discovery and PHY device LAAN8720. I want to configure the register with address = 0b00000 of the LAN8720. 
When I set PHY address = 0b00000 and after write operation of data 0x2100 I did read operation, but the read data was 0x0000. I connected oscilloscope to pin MDIO and saw right impulses in write operation and low level in data field during read operation. Maybe the PHY address is wrong. 
How can I find the PHY address of LAN8720?
Thank You!