Stratix® 10 Hard Processor System Technical Reference Manual
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17.4.3.2. I2C External PHY Management Interface
Some PHY devices use the I2C instead of MDIO for their control interface. Small form factor pluggable (SFP) optical or pluggable modules are often among those with this interface.
The HPS or FPGA can use three of the five general purpose I2C peripherals for controlling the PHY devices:
- i2c_emac_0
- i2c_emac_1
- i2c_emac_2