Table 2-4 Arm CoreSight 20 pinout table (DSTREAMCS20=0) (continued)
Pin Signal name Pin Signal name
7 Key (NC) 8 TDI
9 GND 10 nSRST
11 GND (1) 12 TRACECLK
13 GND (1) 14 TRACEDATA[0]
15 GND 16 TRACEDATA[1]
17 GND 18 TRACEDATA[2]
19 GND 20 TRACEDATA[3]
Pinout when DSTREAMCS20 is set to 1:
Table 2-5 Arm CoreSight 20 pinout table (DSTREAMCS20=1)
Pin Signal name Pin Signal name
1 VTREF 2 TMS/SWDIO
3 GND 4 TCK/SWCLK
5 GND 6 TDO/SWO
7 Key (NC) 8 TDI
9 GND 10 nSRST
11 GND (1) 12 RTCK
13 GND (1) 14 SWO
15 GND 16 nTRST
17 GND 18 DBGRQ
19 GND 20 DBGACK
1. Although these pins are typically grounded on the target board, the MIPI specification also allows
them to carry power. If they are connected to a power rail (or rails) on the target board, these pins
must also be AC-coupled to GND. To couple the pins to GND, use 100nF capacitors that are close to
the connector.
Note
Pin 7 must be removed for compatibility with DSTREAM-ST and MIPI specifications.
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
2.4 CoreSight
™
20 connector
100893_0100_06_en Copyright © 2017–2019 Arm Limited or its affiliates. All rights
reserved.
2-37
Non-Confidential
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