Problems with the MDIO - 16.2 English

1G/2.5G Ethernet PCS/PMA or SGMII LogiCORE IP Product Guide (PG047)

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16.2 English
  • Ensure that the MDIO is driven properly. See MDIO Management Interface for detailed information about performing MDIO transactions.
  • Check that the mdc clock is running and that the frequency is 2.5 MHz or less.
  • Read from a configuration register that does not have all 0s as a default. If all 0s are read back, the read was unsuccessful. Check that the PHYAD field placed into the MDIO frame matches the value placed on the phyad[4:0] of the core.