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.
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.
- To access the SMI interface a wire could be connected to R271 (pullup MDIO) and R495 (Termination MDC).
- 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)