I found ENC28J60 Ethernet PHY chip.
The specifications say that the Physical Network Type is '
10BASE-T' on the one hand, but on the other hand the data rate is '
10 Mbit/s, 100 Mbit/s, 1000 Mbit/s'.
As far as I know, a 10BASE-T chip can not support a data rate of 1Gbit/s !
Moreover, the 10BASE-T doesn't support Full-duplex, but the specifications say that the Communication Mode is '
Full Duplex, Half Duplex'.
Please help me solve this contradiction.