User's Manual l TQMa8MxML UM 0103 l © 2022, TQ-Systems GmbH
Page 30
3.2.5.5
JTAG
On the TQMa8MxML JTAG_TRST# is available for the JTAG interface. On the TQMa8MxNL, JTAG_TRST# is used as BOOT_MODE2
and is therefore not available in the JTAG interface. In this case an external pull circuit must be provided on the carrier board for
this signal to enable the setting of the different Boot Modes.
i.MX 8M Mini / Nano
LGA
JTAG_TCK
JTAG_TDI
JTAG_TMS
JTAG_TDO
JTAG_TCK
JTAG_TDI
JTAG_TDO
JTAG_TMS
JTAG_TRST#
JTAG_TRST#
JTAG_MOD
GND
Figure 11: Block diagram JTAG interface
The following table shows the signals used by the JTAG interface.
Table 23:
JTAG signals
Signal
Direction
CPU ball
TQMa8MxML
Power group
Remark
JTAG_TCK
I
F26
T14
V_3V3
10 kΩ PD on TQMa8MxML
JTAG_TDI
I
E27
U16
–
JTAG_TDO
O
E26
T15
–
JTAG_TMS
I
F27
U15
–
JTAG_TRST#
I
C27
T16
Not available with TQMa8MxNL