1000BASE-T1 SFP MODULE
User Manual
12
3.3
I2C Interface
3.3.1
I2C configuration
100ms after power up of the module it can be configured by I2C.
The module operates with f
SCL
up to 53kHz without requiring clock stretching.
The module may clock stretch with f
SCL
greater than 53kHz and up to 400 kHz.
The module processor listens as slave on the 7-bit address 0x50.
Note
: b1010 000X = 0xA0
Read access beyond address 95 will return 0x00.
The 88Q2112_A2 transceiver can be accessed at I2C slave 7-bit address 0x40.
Note
: b1000 000X = 0x80
The 88Q2112_A1 PHY does not support I2C interfaces. However, the microcontroller
acts as a bridge between the host and the PHY. Commands from the Host are
processed by the microcontroller. The microcontroller accesses to the PHY trough
MDIO interface and forwards the information to the Host.
For a complete register map please have a look at the 88Q2112_A1 datasheet (NDA
required).
