Table 20. LCD interface and CN4 connector pinout
Pin STM32 pin Signal name Function
1 - GND GND
2 DSI_D1N DSI_D1_N D1N
3 DSI_D1P DSI_D1_P D1P
4 - GND GND
5 DSI_CKN DSI_CK_N CKN
6 DSI_CKP DSI_CK_P CKP
7 - GND GND
8 DSI_D0N DSI_D0_N D0N
9 DSI_D0P DSI_D0_P D0P
10 - GND GND
11 PF0 I2C1_SCL SCL
12 PF14 I2C1_SDA SDA
13 - GND GND
14 - 3V3 3V3
15 - 3V3 3V3
16 - GND GND
17 PF2 LCD_INT INT
18 PC6 DSI_TE TE
19 PA15 LCD_BL_CTRL CTRL
20 PE4 DSI_RESET RESET
7.15 Gigabit Ethernet
7.15.1 Description
The STM32MP157A-DK1 and STM32MP157C-DK2 Discovery kits provide a Gigabit reduced medium-
independent interface (RGMII).
The STM32MP157x requires an external physical interface device (PHY). The Realtek RTL8211F-CG is the PHY
on the Discovery kits. The PHY is connected to the physical LAN bus using 13 signals for RGMII. It can be
clocked using the 25 MHz from the STM32MP157x or from a crystal (X2). The default configuration is 25 MHz
from the X2 crystal.
LED LD3 is blinking to indicate the data transmission.
For more details about the PHY (such as clocking or configuration), refer to the datasheet of the Realtek
RTL8211F-CG.
7.15.2 Operating voltage
The Ethernet PHY is supplied directly with 3.3 V. It generates its own 1.05 V supply and digital/analog 3.3 V.
7.15.3 Ethernet interface
Table 21 describes the I/O configuration of the Ethernet interface.
UM2534
Gigabit Ethernet
UM2534 - Rev 1
page 25/47
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