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Arm JTAG 20 connector

The Arm JTAG 20 connector is a 20-way 2.54mm pitch box header which supports JTAG debug, Serial Wire Debug, and SWO trace.

To use this connector with DSTREAM-ST, use the Arm JTAG 20 debug cable supplied in the box contents.

Figure 2-1 Arm JTAG 20 connector pinout


Arm JTAG 20 pinout table

Table 2-2 Arm JTAG 20 pinout table

Pin Signal name   Pin Signal name
1 VTREF   2 NC
3 nTRST   4 GND
5 TDI   6 GND
7 TMS/SWDIO   8 GND
9 TCK/SWCLK   10 GND
11 RTCK   12 GND
13 TDO/SWO   14 GND
15 nSRST   16 GND
17 DBGRQ   18 GND
19 DBGACK   20 GND

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.
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