2.2 About the CoreSight
™
20 connector pinouts and interface signals
You can use the CoreSight
™
20 connector in either standard JTAG (IEEE 1149.1) mode or Serial Wire
Debug (SWD) mode. It can also optionally capture up to 4 bits of parallel trace in Trace Port Interface
Unit (TPIU) continuous mode.
When this connector is configured to be a parallel trace source, pins 12 to 20 switch to their alternate
trace functions.
The following figure shows the CoreSight 20 connector pinout:
2
4
6
8
10
12
16
18
20
14
1
3
5
7
9
11
15
17
19
13
Figure 2-2 CoreSight 20 connector pinout
CoreSight
™
20 pinouts
Table 2-3 CoreSight 20 interface pinout table
Pin Signal name I/O
diagram
Pin Signal name I/O
diagram
1 VTRef G 2 TMS/SWDIO B/C
3 GND H 4 TCK/SWCLK B
5 GND H 6 TDO/SWO A
7 KEY (NC) NA 8 TDI B
9 GND H 10 nSRST E
11 NC I 12 RTCK/TRACECLK A
13 NC I 14 SWO/TraceD0 E
15 GND H 16 nTRST/TraceD1 E
17 GND H 18 DBGRQ/TraceD2 A
19 GND H 20 DBGACK /TraceD3 A
2 ARM
®
DSTREAM-ST target interface connections
2.2 About the CoreSight
™
20 connector pinouts and interface signals
ARM 100893_0100_00_en Copyright © 2017 ARM Limited or its affiliates. All rights reserved. 2-22
Non-Confidential
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