Gigabit Ethernet; Description; Operating Voltage; Ethernet Interface - ST STM32MP157C-DK2 User Manual

Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
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 - Rev 1
Table 20. LCD interface and CN4 connector pinout
STM32 pin
-
DSI_D1N
DSI_D1P
-
DSI_CKN
DSI_CKP
-
DSI_D0N
DSI_D0P
-
PF0
PF14
-
-
-
-
PF2
PC6
PA15
PE4
Signal name
GND
DSI_D1_N
DSI_D1_P
GND
DSI_CK_N
DSI_CK_P
GND
DSI_D0_N
DSI_D0_P
GND
I2C1_SCL
I2C1_SDA
GND
3V3
3V3
GND
LCD_INT
DSI_TE
LCD_BL_CTRL
DSI_RESET
UM2534
Gigabit Ethernet
Function
GND
D1N
D1P
GND
CKN
CKP
GND
D0N
D0P
GND
SCL
SDA
GND
3V3
3V3
GND
INT
TE
CTRL
RESET
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