I2C and Ethernet Addressing

The HDK's ethernet ports are driven by a 4-port Marvell 88E6321 switch with its uplink tied to the host AP's SGMII bus. Only the 2 ethernet ports are connected.

Rev1 HDKs utilize the switch's Reduced Gigabit Media-Independent Interface (RGMII) port for legacy EM support.

The HDK's switch is unmanaged by default. Though the MDC/MDIO are connected, they are not currently supported by the Host AP software.

The MDC/MDIO interface is connected to the CPU side of the access point. This interface is intended for Cisco-internal use only. Third party module vendors shall not rely on this interface to manage their PHYs as there is no host software support for this bus. For third party-developed modules, MDC/MDIO lines must interface to the on-board CPU managing the PHY device.

Note: Rev2 HDKs delete the EM support; the RGMII is not accessible.

Ethernet MDC/MDIO Addresses

Note: Third party modules shall not rely on the host AP to manage module PHYs. PHYs, if used, must be managed by the module itself.

I2C Addresses