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DP83867IR: RGMII at 10/100 Vs 1000

Barak Dror
Prodigy 170 points
Part Number: DP83867IR


Hi,

I plan to use the DP83867 in my design with RGMII interface to the MAC.

My unit can be connected to 100M/1000M port. As I understand auto negotiation will detect to which port I connected my unit.

How is the mac  "knows" which GTX_CLK to drive? 

  • 0
    TI__Mastermind 19780 points
    Hi Barak,

    Your MAC can determine which frequency GTX_CLK to drive by 1 of 2 methods: reading status registers from the PHY, or using RGMII in-band signaling as defined in the RGMII specification.

    Typically MACs use the register information from the PHY by MDIO. The MAC will read out the register 0x1 and 0x11.

    Best Regards,