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Hardware layout and configuration
U5V, the user must pay attention that the power source delivers a sufficient amount of
current for the complete STM32H747I-DISCO board setup.
When a USB host connection to the CN1 Micro-AB USB connector of STM32H747I-DISCO
is detected, the STM32H747I-DISCO board starts behaving as a USB device. Depending
on the powering capability of the USB host, the board can take power from the VBUS
terminal of CN1. In the board schematics, the corresponding power voltage line is called
HS.
Refer to
5.6.2
STM32H747I-DISCO as USB host
When a USB device connection to the CN1 Micro-AB USB connector is detected, the
STM32H747I-DISCO board starts behaving as USB host. It sources 5 V on the VBUS
terminal of CN1 Micro-AB USB connector to power the USB device. For this to happen, the
STM32H747XIH6 MCU sets the U2 power switch to the ON state via the USB PHY. The
LD7 green LED marked OTG_HS indicates that the peripheral is supplied by the board. The
LD5 red LED marked HS_OC lights up if over-current is detected.
5.7
Ethernet
The STM32H747I-DISCO board supports 10 Mbps / 100 Mbps Ethernet communication
with the U18 PHY and the CN7 integrated RJ45 connector. The Ethernet PHY is connected
to the STM32H747XIH6 MCU via the RMII interface.
The 25 MHz clock for the PHY is generated by oscillator X2. The 50 MHz clock for the
STM32H747XIH6 is provided by the RMII_REF_CLK of the PHY.
With the default setting, the Ethernet feature is not working because of a conflict between
ETH_MDC and SAI4_D1 of the MEMs digital microphone.
settings of all solder bridges or resistor associated with the Ethernet on the board.
Solder bridge
/ resistor
SB8, SB21
SB17, R87
20/51
Section 5.2: Power supply on page 14
Table 5. Ethernet related solder bridge and resistor settings
Setting
SB8 open,
SB21 closed
SB8 closed,
SB21 open
R87 closed,
SB17 open
R87 open,
SB17 closed
for the related jumper setting.
Default setting.
STM32H747XIH6 port PC1 is connected to MEMs. digital
microphone DOUT.
STM32H747XIH6 port PC1 is connected to Ethernet
ETH_MDC.
Default setting.
STM32H747XIH6 port PE2 is connected to MEMs. digital
microphone CLK.
STM32H747XIH6 port PE2 is connected to Ethernet
ETH_nINT.
UM2411 Rev 5
Table 5
shows the possible
Configuration
UM2411
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