ST NUCLEO-H7A3ZI-Q User Manual

Hardware layout and configuration UM2408
30/51 UM2408 Rev 2
6.12 Ethernet (Only with NUCLEO-H745ZI-Q and NUCLEO-H755ZI-
Q)
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 microcontroller via the RMII interface. 50
MHz clock for the STM32H7
microcontroller is generated by the PHY RMII_REF_CLK.
Note: 1.NUCLEO-H7A3ZI-Q does not support the Ethernet function.
2.JP6 and JP7 must be ON when using Ethernet.
3.On MB1363 Rev.C: 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'. SB13 can also be removed to get the same effect.
\
Table 14. Ethernet pin configuration
Pin name Function
Conflict
with ST
Zio
connector
signal
Configuration when using Ethernet
(1)
1. The default SBx state is shown in bold.
Configuration
when using ST
Zio or ST morpho
connector
PA1
RMII Ref
Clock
-
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB80 ON
SB80 OFF
PA2 RMII MDIO A8
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: JP7 ON
JP7 OFF
PC1 RMII MDC -
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB84 ON
SB84 OFF
PA7
RMII RX
Data Valid
-
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB52 ON
SB52 OFF
PC4 RMII RXD0 -
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB63 ON
SB63 OFF
PC5 RMII RXD1 -
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB48 ON
SB48 OFF
PG11
RMII TX
Enable
-
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB36 ON
SB36 OFF
PG13 RXII TXD0 -
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: SB46 ON
SB46 OFF
PB13 RMII TXD1 D18
NUCLEO-H745ZI-Q / NUCLEO-H755ZI-
Q: JP6 ON, SB8 OFF
JP6 OFF, SB8 ON
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ST NUCLEO-H7A3ZI-Q Specifications

General

Brand	ST
Model	NUCLEO-H7A3ZI-Q
Category	Motherboard
Language	English