
REL0.2
Page 42 of 58
i.MX8M SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.9.4
Debug UART Header (Optional)
The i.MX8M SMARC SOM optionally supports 3pin UART header for i.MX8M
CPU’s
debug purpose. The i.MX8M
CPU’s
UART1 can be connected to this header via 1.8 to 3.3 voltage level translator.
FTDI’s UART to USB smart cable (
TTL-
232R-RPI)
can be directly connected between this header and Host PC for debugging.
This is the optional feature and will not be populated in default configuration.
Table 7: Debug UART Header Pin Out (Optional)
Pin No
Pin Name
Signal Name
Signal Type/
Termination
Description
1
UART1_TXD
UART1_TXD /
A7
O, 1.8V CMOS
Debug UART Transmitter
2
UART1_RXD
UART1_RXD/
C7
I, 1.8V CMOS
Debug UART Receiver.
3
GND
GND
Power
Ground