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MIPI 34 connector

The MIPI 34 connector is a 34-way 1.27mm pitch box header which supports JTAG debug, Serial Wire Debug, SWO trace, and up to 4-bit wide continuous-mode TPIU trace.

The MIPI 34 connector supports separate voltage domains for the debug and trace signals. You must supply the appropriate voltages to both of the VTREF pins.

Note

This connector is rarely used on target boards. The MIPI 34 adapter and debug cable is not supplied with the DSTREAM-ST unit, but are available on request.

Figure 2-6 MIPI 34 connector pinout


MIPI 34 pinout table

Table 2-8 MIPI 34 pinout table

Pin Signal name   Pin Signal name
1 DEBUG_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 TRST_PD (2)
15 GND   16 nTRST
17 GND   18 DBGRQ
19 GND   20 DBGACK
21 GND   22 TRACECLK
23 GND   24 TRACEDATA[0]
25 GND   26 TRACEDATA[1]
27 GND   28 TRACEDATA[2]
29 GND   30 TRACEDATA[3]
31 GND   32 TRACEEXT (3)
33 GND   34 TRACE_VTREF

Note

  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 power rail (or rails) on the target board, these pins must also be AC coupled to GND using 100nF capacitors that are close to the connector.
  2. The TRST_PD signal allows the target board to have a second TAP reset signal which is normally pulled-down. For more information, see the MIPI debug connector specification.
  3. The TRACEEXT signal is not supported by DSTREAM-ST.

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.
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