GBE0/1_CTREF pins connection of I-Pi SMARC carrier board

• HA

  Hiro ATech

  11/23/25, 7:59 AM

  Attached is the schematic of the Ethernet-related circuitry near the RJ45 connectors on the I-Pi SMARC carrier board.
  In the diagram, resistors R801, R802, R803, and R804 are marked as "NI", (I expect) indicating they are not implemented. As a result, the GBE0_CTREF and GBE1_CTREF pins appear to be clamped to ground through the parallel capacitor pairs C801/C804 and C802/C803, respectively.
  I would like to confirm: does the "NI" marking on these resistors indeed mean they are "not implemented" in this schematic?
  
  　
  
  * Attached is the diagram on page 8 of I-Pi SMARC carrier board schematic drawings.
  
  
  

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• 

  Master of SMARC Staff member

  12/23/25, 6:43 AM

  Hi Hiro, 

  NI = Not installed, your assumption is correct

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