It can be seen from this photo that it supports 100BASE-T1, but the actual situation is that the development board does not have this T1 interface.
Hi @AtomDeng ,
Thanks for your interest in NXP MIMXRT series!
The diagram is an application-level system block diagram, not the hardware block diagram of the MIMXRT1180-EVK. It shows that the i.MX RT1180 Ethernet/EtherCAT interfaces can be connected to external TJA1103 PHYs to implement 100BASE-T1.
The MIMXRT1180-EVK itself does not populate TJA1103 PHYs or 100BASE-T1 connectors. Its five onboard Ethernet ports use standard 10/100BASE-TX or 10/100/1000BASE-T PHYs with RJ45 connectors.
Please check this diagram in <UM12021 MIMXRT1180-EVK Board User Manual >:
Best regards,
Gavin
"While the reference photo or documentation indicates support for 100BASE-T1, the physical connector is likely omitted on this specific board variant. This is common in development hardware where the underlying PHY chip or circuit traces may be present on the PCB, but the physical automotive connector is unpopulated to reduce costs, or the signals are routed to standard pin headers instead."