In certain applications, the client-side GMII/MII datapath can be used as a true GMII/MII to connect externally off-device across a PCB. This external GMII/MII functionality is included in the HDL block level and is seamlessly delivered with the core by the AMD Vivado ™ IP catalog. This extra logic required to accomplish this is described in this Appendix.
Note: AMD Virtex ™ 7 devices support GMII at 3.3V or lower only in certain parts and packages; see the Virtex 7 device documentation. AMD Zynq ™ 7000 SoC, AMD Kintex ™ 7, and AMD Artix ™ 7 devices support GMII at 3.3V or lower.