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AM335x - Ethernet MIIM Interface

Other Parts Discussed in Thread: AM3352

Hi,

I'm using an AM3352 with an Ethernet PHY - KZS9021 from Micrel. Reading the PHY's datasheet it's showing the connection considering only 12 pins to the RGMII interface.

I saw other applications telling about using those 12 pins + 2 pins from  MIIM interface (MDIO and MDC) on the Sitara for management interface between the STA and the PHY.

The question is, I'm trying to find out the functions and purpose of the MIIM interface on the IEEE 802.3. But unfortunately I did not understand it.

My main function with the ethernet port will be only for debbug information and faster coppy files from my hardware and my station. Will I need the benefits from MIIM interface? Is disposable?

I'm running out of GPIOs in my hardware, so this question is important since I wish to use those pins (MDIO and MDC) for other purposes..

  • Hi Ricardo,
     
    The Management interface is necessary if you use a MII PHY. Through it the PHY is configured and link status is monitored. If you don't need the Gigabit option then you can use RMII - lower pin count. Also, if you don't need a very large bandwidth (and if you have a free USB port) you can consider an USB to Ethernet controller (SMSC have several such IC's).