MITO 8M SOM/MITO 8M Hardware/Peripherals/Ethernet

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Issue Date Notes
2020/10/19 First release

Peripheral Ethernet[edit | edit source]

Description[edit | edit source]

The 10/100/1000-Mbit/s Ethernet interface available on MITO 8M is based on iMX8M SoC.

The SOC is directly interfaced with an ETH PHY chip (MICROCHIP KSZ9031RNX) that has the following features:

  • Auto-Negotiation to Automatically Select the Highest Link-Up Speed (10/100/1000 Mbps) and Duplex (Half/Full)
  • On-Chip Termination Resistors for the Differential Pairs
  • Energy Detect Power-Down Mode for Reduced Power Consumption When the Cable is Not Attached

Important note for the external magnetic connection[edit | edit source]

The Ethernet peripheral requires an external insulator magnetic on the carrier board.

The four transformer center tap pins on the PHY side should not be connected to any power supply source on the board; rather, the center tap pins should be separated from one another and connected through separate 0.1 µF common-mode capacitors to ground. Separation is required because the common-mode voltage could be different between the four differential pairs, depending on the connected speed mode.

See KSZ9031RNX datasheet for more details.

Pin mapping[edit | edit source]

The Pin mapping is described in the Pinout table section