Good day all,
I was hoping to get some TI feedback and troubleshooting my network design. I am using the STM32F4 lineup with includes out of the box support for the DP83848J. It must be noted that this MCU has a built in MAC.
I am also using RMII layout for my board.
The prototype is sitting here on my desk and I seem unable to get the PHY to communicate. As I am validating the software settings I wanted to get started on troubleshooting potential physical hardware layout issues. It's worth noting that for some reason, the LED_SPD light is very faintly illuminated when the board has power but the LED_LINK light is not. The jack shown has integrated magnetics.
As early troubleshooting steps performed, I have verified the 50MHz clock is operational with a scope.
Here is my schematic derived from the reference design for this product: