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
Part | Address | Applies to | Note |
---|---|---|---|
Ethernet switch | 00010 (0x2) | AP3800 | - |
EM module | 00001 (0x1) | AP3800 | (rev1 HDK only) |
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
Part | Address | Applies to | Note |
---|---|---|---|
U4 PSE controller | 010 0001 (0x21)011 0001 (0x31) | AP3800 | 0x21: MSCC External Automode (default)0x31: Semi/ Auto mode |
U10 IDPROM | 101 0000 (0x50) | AP3800 | - |
U11 ACT2 | 111 0000 (0x70) | AP3800 | Reserved, not fitted |
U13 ALS | 100 0100 (0x44) | AP3800/Module | - |
U14 Temp/Hum | 100 0000 (0x40) | AP3800/Module | - |
J7 External sensor | TBD | AP3800/Module | - |