The height profile of the Ethernet FMC and Robust Ethernet FMC is the critical difference between the two models.
The figure below illustrates the height profile of the Ethernet FMC. Note that the quad RJ45 connector with integrated magnetics has a maximum height of 13.84mm; this limits the Ethernet FMC for mating only with FMC connectors that are located close to the edge of the carrier board. In other words, the Ethernet FMC must be able to extend over the edge of the carrier board to allow for clearance of the RJ45 connector. All of the Xilinx development boards provide this level of clearance and are designed with the FMC connectors in close proximity to the edge of the board.
The figure below displays an example of a carrier board with an FMC connector that is located in close proximity to the board edge. The Ethernet FMC is limited to mating with this type of carrier board only.
Robust Ethernet FMC¶
The figure below illustrates the height profile of the Robust Ethernet FMC. All of the components on the Robust Ethernet FMC fit within the 10mm gap between the FMC card and the development board. It was designed this way to allow it to mate with all FMC carrier boards, including those that provide a dedicated area for fixing the FMC to the carrier by means of the 4 hex standoffs.
The figure below displays an example of a carrier board with a dedicated area for fixing the FMC. In this case, the FMC connector is not located close to the board edge and the FMC must have a height profile that fits within the 10mm gap. The Robust Ethernet FMC was designed for this type of carrier, but is not limited to this type.
The mechanical dimensions of the Ethernet FMC and Robust Ethernet FMC are illustrated in the figures below. All dimensions are in millimeters (mm).
The assembly drawings are also available as PDF files that you can download at the provided links.