2.1 About the ARM
®
JTAG 20 connector pinouts and interface signals
The ARM JTAG 20 connector is a 20-way 2.54mm pitch connector. You can use it in either standard
JTAG (IEEE 1149.1) mode or Serial Wire Debug (SWD) mode.
The following figure shows the ARM JTAG 20 connector pinout:
2
4
6
8
10
12
16
18
20
14
1
3
5
7
9
11
15
17
19
13
Figure 2-1 ARM JTAG 20 connector pinout
ARM
®
JTAG 20 pinouts
The table shows the ARM JTAG 20 pinouts as used on the target board.
Table 2-1 ARM JTAG 20 interface pinout table
Pin Signal name I/O
diagram
Pin Signal name I/O
diagram
1 VTRef F 2 NC NA
3 nTRST D 4 GND H
5 TDI B 6 GND H
7 TMS/SWDIO B/C 8 GND H
9 TCK/SWCLK B 10 GND H
11 RTCK A 12 GND H
13 TDO/SWO A 14 GND H
15 nSRST E 16 GND H
17 DBGRQ B 18 GND H
19 DBGACK A 20 GND H
ARM
®
JTAG 20 interface signals
The table describes the signals on the ARM JTAG 20 interface.
Table 2-2 ARM JTAG 20 signals
Signal I/O Description
TDI Output The Test Data In pin provides serial data to the target during debugging. TDI can be pulled HIGH on the
target.
TDO Input The Test Data Out pin receives serial data from the target during debugging. You are advised to series
terminate TDO close to the target processor. TDO is typically pulled HIGH on the target.
2 ARM
®
DSTREAM-ST target interface connections
2.1 About the ARM
®
JTAG 20 connector pinouts and interface signals
ARM 100893_0100_00_en Copyright © 2017 ARM Limited or its affiliates. All rights reserved. 2-20
Non-Confidential
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