The GEM operating mode is controlled by [speed] and [gigabit_mode_enable] bits in the Network_Config register as shown in the following table.
| Operating Mode | Network_Config | I/O Interface Options | |
|---|---|---|---|
| [speed] | [gigabit_mode_enable] | ||
| 10 Mb/s | 0 | 0 | RGMII/GMII/MII |
| 100 Mb/s | 1 | 0 | RGMII/GMII/MII |
| 1000 Mb/s | x | 1 | RGMII/GMII/MII |