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i.MX8 SMARC SOM Hardware User Guide
iWave Systems Technologies Pvt. Ltd.
Table 6: Debug Header Pin Assignment
Pin No
Signal Name
Signal Type/
Termination
Description
1
VREF
O, 1.8V Power
VTREF Voltage Reference.
2
VSUPPLY
O, 1.8V Power
Supply Voltage.
3
JTAG_TRSTB
I, 1.8V CMOS/
10K PU
JTAG test reset signal.
4
GND
Power
Ground.
Note: Optionally connected to SCU_UART0_TX
5
JTAG_TDI
I, 1.8V CMOS/
10K PU
JTAG test data input.
6
GND
Power
Ground.
Note: Optionally connected to SCU_UART0_RX
7
JTAG_TMS
I, 1.8V CMOS/
10K PU
JTAG test mode select.
8
GND
Power
Ground.
Note: Optionally connected to M41.UART0.TX
and UART4_TX.
9
JTAG_TCK
I, 1.8V CMOS/
10K PD
JTAG test Clock.
10
GND
Power
Ground.
Note: Optionally connected to M41.UART0.RX
and UART4_RX.
11
-
-
Only pull down is provided.
12
GND
Power
Ground.
13
JTAG_TDO
O, 1.8V CMOS
JTAG test data output.
14
GND
Power
Ground.
15
JTAG_RESETB
I, 1.8V CMOS/
10K PU
Reset input.
16
GND
Power
Ground.
17
-
-
Only pull up is provided.
18
GND
Power
Ground.
19
-
-
Only pull down is provided.
20
GND
Power
Ground.