UM2407 Rev 3 35/49
UM2407 Board connectors
48
7.3 Ethernet RJ45 connector (CN14)
The STM32H7 Nucleo-144 board supports 10Mbps/100Mbps Ethernet communication with
the PHY (U15) and integrated RJ45 connector (CN14). The Ethernet PHY is connected to
the MCU via the RMII interface.
The X4 oscillator generates the 25 MHz clock for the PHY. The 50 MHz clock for the MCU
(derived from the 25
MHz crystal oscillator) is provided by the RMII_REF_CLK of the PHY.
Figure 15. Ethernet RJ45 connector (CN14) front view
1. Green LED: Ethernet traffic
2. Amber LED: Ethernet connection
The related pinout for the Ethernet connector is listed in Table 17.
Table 17. Ethernet RJ45 connector (CN14) pinout
Connector
Pin
number
Description MCU pin
Pin
number
Description MCU pin
CN14
1TX+ - 7 NC -
2TX- - 8 NC -
3 RX+ - 9 K, yellow LED -
4 NC - 10 A, yellow LED -
5 NC - 11 K, green LED -
6 RX- - 12 A, green LED -
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