ORCA SOM/ORCA Hardware/Peripherals/Ethernet

From DAVE Developer's Wiki
Jump to: navigation, search
Issue Date Notes


First release
2021/06/18 Add ethernet speed details

Peripheral Ethernet[edit | edit source]

Description[edit | edit source]

The 10/100/1000-Mbit/s Ethernet interfaces available on ORCA is based on iMX8MPlus SoC wich provides the following interfaces:

  • 2x triple-speed 10/100/1000-Mbit/s Ethernet MAC compliant with the IEEE802.3-2002 standard
    • compatibility with half- or full-duplex 10/100-Mbit/s and full-duplex gigabit Ethernet LANs
  • 2x RGMII ENET with IEEE 1588 functionality
    • standard IEEE 802.3 Ethernet MAC with a time-stamping module

One interface is directly connected with an on board ETH PHY chip (MICROCHIP KSZ9131RNX) 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 KSZ9131RNX datasheet for more details.

Pin mapping[edit | edit source]

The Pin mapping is described in the Pinout table section