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 |
- |