Hardware Manual: emSTAMP- emSBC-Argon (Rev1)
25/35
6.2
microSD-Card socket
A microSD-Card socket J6 is available on the emSBC-Argon. The socket J6 is connected to the
SDMMC1 interface of the STM32MP157 processor via an integrated EMI-filter and TVS diodes array.
An active-low card-detect signal of the microSD-Card socket is available but there is no write
protection.
The microSD-Card socket can be used as boot-device. Please refer to the chapter 6.11 “Boot
configuration DIP-Switch” for more information how to set the appropriate boot-configuration.
If the SDMMC1 interface needs to be available on the RPi-extension connector, these resistors need
to be removed to avoid signal reflections caused by wire stubs.
6.2.1
Pinout of microSD-Card connector J6
Pin
Signal
CPU Pin
Name
Module
Pin
1
SDMMC1_D2
PC10
58
2
SDMMC1_D3
PC11
57
3
SDMMC1_CMD
PD2
61
4
VDD_SD
5
SDMMC1_CK
PC12
62
6
GND
7
SDMMC1_D0
PC8
60
8
SDMMC1_D1
PC9
59
9
SDMMC1_CD#
PB7
56
10
GND
Note:
The SDMMC1 interface of the STM32MP157 is shared between the MicroSD-Card socket and
the 40-pin RPi-extension connector J13. As default the SDMMC1 interface is connected to the
microSD-Card socket via the 0R-resistors R66, R67, R68, R70, R71 and R72.
