AMD Virtex™ 7 devices support GMII at 3.3 V or lower only in certain parts and packages; see 7 Series FPGAs SelectIO Resources User Guide (UG471). AMD Kintex™ 7 devices support TBI and GMII at 3.3 V or lower. AMD Artix™ 7 and AMD Zynq™ 7000 devices support GMII at 3.3 V or lower.