Hardware layout and configuration UM2407
28/50 UM2407 Rev 2
ESD protection part USBLC6-2SC6 is implemented on USB port because all USB pins on
STM32H7 are dedicated to USB port protection only on the STM32H7 Nucleo-144 board.
USB pin ID is not used.
6.6.7 Ethernet
The STM32H7 Nucleo-144 board supports 10M/100M Ethernet communication by a PHY
LAN8742A-CZ-TR (U15) and RJ45 connector (CN14). Ethernet PHY is connected to the
STM32H7 Series microcontroller via the RMII interface. 50
MHz clock for the STM32H7
Series microcontroller is generated by the PHY RMII_REF_CLK.
Note: 1.JP6 and SB72 must be ON when using Ethernet.
2.Ethernet PHY LAN8742A must be set in power-down mode (in this mode Ethernet PHY
ref clock turns off) to achieve the expected low-power mode current. This is done by
configuring Ethernet PHY LAN8742A basic control register (at address 0x00) bit 11 (power
down) to '1'. SB57 can also be OFF to get the same effect.
Table 12. USB pin configuration
Pin
name
Function
Configuration
when using USB
connector
Configuration
when using ST
morpho connector
Remark
PA8 USB SOF - - Test point TP4
PA9 USB V
BUS
SB23 ON SB23 OFF -
PA10 USB ID SB24 ON SB24 OFF -
PA11 USB DM SB21 ON SB21 OFF -
PA12 USB DP SB22 ON SB22 OFF -
PD10 USB PWR EN SB77 ON SB77 OFF -
PG7 USB FS OVCR SB76 ON SB76 OFF -
Table 13. Ethernet pin configuration
Pin
name
Function
Conflict with
ST Zio
connector
signal
Configuration when
using Ethernet
Configuration when
using
ST Zio or ST morpho
connector
PA1
RMII Reference
Clock
- SB57 ON SB57 OFF
PA2 RMII MDIO - SB72 ON SB72 OFF
PC1 RMII MDC - SB64 ON SB64 OFF
PA7 RMII RX Data Valid - SB31 ON SB31 OFF
PC4 RMII RXD0 - SB36 ON SB36 OFF
PC5 RMII RXD1 - SB29 ON SB29 OFF
PG11 RMII TX Enable - SB27 ON SB27 OFF
PG13 RXII TXD0 - SB30 ON SB30 OFF
PB13 RMII TXD1 I2S_A_CK JP6 ON JP6 OFF
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