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i.MX8 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
2.7.12
Data UART
SMARC V2.1.1 supports four UART channels where two channels SER0 & SER2 are with CTS and RTS and two channels
SER1 & SER3 are without. The i.MX8
CPU’s
UART0 and UART3 connected SER0 and SER1 channels of SMARC Edge
connector respectively. Whereas SER2 channel of SMARC Edge connector optionally connected to UART1 and
M40.UART0 of i.MX8 CPU. In default configuration UART1 is connected to on SOM Bluetooth module. SER0, SER1 &
SER2 can be used for any data commination. UART4 of the CPU is connected to SER3 channel of SMARC Edge connector
and used as Debug UART.
For more details on UART pinouts, refer below table:
SMARC
Pin No.
SMARC Edge
Signal Name
CPU Ball Name/
Pin Number
Signal Type/
Termination
Description
P129
UART0_TX
UART0_TX/
AV50
O, 1.8V CMOS
UART0 Transmitter.
P130
UART0_RX
UART0_RX/
AV48
I, 1.8V CMOS
UART0 Receiver.
P131
UART0_RTS_B
UART0_RTS_B/
AU45
O, 1.8V CMOS
UART0 Request to Send.
P132
UART0_CTS_B
UART0_CTS_B/
AW49
I, 1.8V CMOS
UART0 Clear to Send.
P134
UART3_TX
UART3_TX/
AU47
O, 1.8V CMOS
UART3 Transmitter.
P135
UART3_RX
UART3_RX/
AP44
I, 1.8V CMOS
UART3 Receiver.
P136
NC.
M40_I2C0_SDA/
AU51
or
UART1_TX/
AY48
O, 1.8V CMOS
100K PU/PD*
NC.
Note: AU51 can be used as M4 Core-0
UART0.TX but also used for board
configuration, hence termination can
change between PU and PD based on
board configuration number
.
Note: Optionally connect to UART1_TX.
P137
NC
M40_I2C0_SCL/
AM44
or
UART1_RX/
AT44
I, 1.8V CMOS
100K PU/PD*
NC.
Note: AM44 can be used as M4 Core-0
UART0.RX but is also used for board
configuration, hence termination can
change between PU and PD based on
board configuration number
Note: Optionally connect to
UART1_RX
.
P138
NC
UART1_RTS_B/
AR43
O, 1.8V CMOS
NC.
Note: Optionally connect to
UART1_RTS_B
P139
NC
UART1_CTS_B/
AV46
I, 1.8V CMOS
NC.
Note: Optionally connect to
UART1_CTS_B
.
P140
UART4_TX
UART4_TX/
AU53
O, 1.8V CMOS
Debug UART Transmitter.
P141
UART4_RX
UART4_RX/
AR47
I, 1.8V CMOS
Debug UART Receiver.