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MX7D SABRE RGMII2 modification

Question asked by Lars Heinrichs on Jul 7, 2017
Latest reply on Jul 11, 2017 by Lars Heinrichs

Hello Community!

 

BACKGROUND:

Before creating custom MX7D hardware from scratch I would like to create an addon board for the SABRE and test custom peripherals. This way, all peripherals can be tested with a known-to-work base platform. Once the peripherals are tested, the SoC/RAM/memory etc circuitry/hardware will be created and combined with the peripherals.

 

ETHERNET:

One of the peripherals is Ethernet and i would like to test my Ethernet Phy circuitry on the addon board.

SMI and RMII signals are needed.

  1. SMI:
    • To access the SMI interface a wire could be connected to R271 (pullup MDIO) and R495 (Termination MDC).
  2. RMII:
    • ENET2 signals are multiplexed with EPDC signals and should be accessible through the EPDC connector.
    • I need to cut the connection of ENET2 and the SABRE Ethernet Phy. how may i do this? remove U36?
    • Are any additional steps necessary to access the signals? (e.g. adding resistors/bridges)

 

 

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