2.5 TI JTAG 14 connector
The Texas Instruments (TI) JTAG 14 connector is a 14-way 2.54mm pitch box header which supports
JTAG debug, Serial Wire Debug, and SWO trace.
To use this connector with DSTREAM-ST, the supplied TI JTAG 14 adapter must be used with the Arm
JTAG 20 debug cable.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
Figure 2-4 TI JTAG 14 connector pinout
TI JTAG 14 pinout table
Table 2-6 TI JTAG 14 pinout table
Pin Signal name Pin Signal name
1 TMS/SWDIO 2 nTRST
3 TDI 4 GND
5 VTREF 6 NC
7 TDO/SWO 8 GND
9 RTCK 10 GND
11 TCK/SWCLK 12 GND
13 DBGRQ 14 DBGACK
Warning
• Using a non-shrouded header on the target board can lead to short-circuits or signal contention. To
ensure the correct polarity and position, Arm recommends that you use a fully shrouded box header.
• For the pin-out of the TI JTAG 14 connector, do not use 14-way IDC cables to connect the target
board and debug unit. To avoid cross-talk issues between nTRST, TMS, and TDI, the DSTREAM-
ST TI JTAG 14 adapter must connect directly to the target board.
2 Target interface connectors
2.5 TI JTAG 14 connector
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