7.16 Dual 10/100Mbit/s Ethernet
7.16.1 Description
The STM32MP135F-DK Discovery kit provides a reduced media-independent interface (RMII).
The STM32MP135FAF7 requires an external physical interface device (PHY) for each RMII. The Ethernet PHY
on the Discovery kit is connected to the physical LAN bus using 10 or 11 signals for RMII on Wake on LAN (WoL)
support.
The main Ethernet port, Ethernet 1, can be clocked using the 25 MHz from the STM32MP135FAF7 or from a
crystal (X3) as it supports Wake on LAN (WoL) operation. The default configuration is 25 MHz from the X3 crystal.
The second Ethernet port, Ethernet 2, can only be clocked using the 25 MHz from the STM32MP135FAF7 as it
does not support Wake on LAN (WoL) operation.
The Ethernet connector embedded LED blink to indicate data transmission.
For more details about the Ethernet PHY (such as clocking or configuration), refer to the bill of material and to the
corresponding datasheet from the PHY provider.
7.16.2 Operating voltage
The Ethernet PHYs are supplied with 3V3_AO for Ethernet 1 and with 3V3_SW for Ethernet 2.
7.17 GPIO expansion connector
7.17.1 Description
• The GPIO pins can be used as GPIOs or alternate functions. The available alternate functions are listed in
Table 23. STM32MP135 Discovery kit I/O assignment.
• Other functions such as I
2
C, UART, or CAN FD can be mapped on the GPIO connector, for instance using
the STM32CubeMX tool.
• The GPIO expansion connector CN8 offers Raspberry Pi
®
shields capability.
UM2993
Dual 10/100Mbit/s Ethernet
UM2993 - Rev 2
page 23/42
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