2.2 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.
1 2
3 4
5 6
7 8
9 10
11 12
13 14
15 16
17 18
19 20
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.
2 Target interface connectors
2.2 Arm JTAG 20 connector
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reserved.
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