I have the schematic of Arduino DUE for EAGLE software, I found a part I dont know what means for Altium Software.

Can somebody tell me what is it "ETH" ? A header??

Arduino Due schematic

enter image description here

I found this schematic Altium on Internet

DUE Altium

  • 1
    \$\begingroup\$ Where did you find the schematic, can you add a link to it? \$\endgroup\$
    – Tyler
    Jun 17, 2019 at 13:18
  • 1
    \$\begingroup\$ Based on the signal names, it is almost certainly 'Ethernet' \$\endgroup\$ Jun 17, 2019 at 13:20
  • 1
    \$\begingroup\$ How do you even make something like that in Altium? I thought people who like to hide power pins were bad enough. \$\endgroup\$
    – Barleyman
    Jun 17, 2019 at 13:32
  • \$\begingroup\$ Arduino official page I found schematics \$\endgroup\$
    – asterix
    Jun 17, 2019 at 13:52

1 Answer 1


That is almost certainly Ethernet that appears to go to a connector of some description. This is the RMII or RGMII port (That is clear from the two data bits in each direction rather than 4)

The signal naming convention seems to be:

E (Ethernet)

Signal direction for signals that have specific direction: TX (Transmit), RX (Receive)

Signal name

Port ID This is all on ethernet port A

So ETXD0A is Ethernet, Transmit, D0 (data bit zero), port A.

  • \$\begingroup\$ The Cortex chip has a 16 pin Ethernet interface. Two of the pins seem to be missing from that diagram? \$\endgroup\$
    – hekete
    Jun 17, 2019 at 14:20
  • \$\begingroup\$ RXDV and CRS are multiplexed in RMII and COL is omitted in RMII. One of the unlabelled connections is MDC. \$\endgroup\$ Jun 17, 2019 at 14:29

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