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Trace connectors

The V2M‑Juno motherboard provides two debug connectors that together support 32‑bit trace.

The Juno Arm® Development Platform SoC supports up to 32‑bit trace output from the CoreSight™ Trace Port Interface Unit (TPIU) and enables connection of a compatible trace unit. Two MICTOR trace connectors, labeled TRACEA‑SINGLE and TraceB DUAL, connect to the TPIU.

The two connectors support 32‑bit trace when you use them together. The TRACEA‑SINGLE connector, when you use it alone, supports 16‑bit trace.

The connectors also support Serial Wire Debug (SWD).

Note

  • DSTREAM is an example of a trace module that you can use.
  • All trace and SWD signals operate at 1.8V.
  • The trace connectors cannot supply power to a trace unit.

The following figure shows the MICTOR 38 connector.

Figure A-2 MICTOR 38 connector, J27 and J28


The following table shows the pin mapping for the Trace and SWD signals on the TRACEA‑SINGLE connector, J28.

Table A-2 TRACEA‑SINGLE connector, J28, signal list

Pin Signal Pin Signal
1 No connection 2 No connection
3 No connection 4 No connection
5 GND 6 TRACE_CLKA
7 EDBGRQ 8 DBGACK
9 No connection/nSRST 10 GND
11 TDO/SWO 12 1V8 reference
13 RTCK 14 1V8_OUT
15 TCK/SWCLK 16 TRACEDATA[7]
17 TMS/SWDIO 18 TRACEDATA[6]
19 TDI 20 TRACEDATA[5]
21 nTRST 22 TRACEDATA[4]
23 TRACEDATA[15] 24 TRACEDATA[3]
25 TRACEDATA[14] 26 TRACEDATA[2]
27 TRACEDATA[13] 28 TRACEDATA[1]
29 TRACEDATA[12] 30 GND
31 TRACEDATA[11] 32 GNDDETECT
33 TRACEDATA[10] 34 1V8 reference
35 TRACEDATA[9] 36 TRACECTL
37 TRACEDATA[8] 38 TRACEDATA[0]

Note

  • The trace connector cannot supply power to a trace unit.
  • The interface does not support the TRACECTL signal. The Juno SoC always drives this signal LOW.

The following table shows the pin mapping for the trace signals on the TraceB DUAL connector, J27.

Table A-3 TraceB DUAL connector, J27, signal list

Pin Signal Pin Signal
1 No connection 2 No connection
3 No connection 4 No connection
5 GND 6 TRACE_CLKB
7 No connection 8 No connection
9 No connection 10 No connection
11 No connection 12 1V8 reference
13 No connection 14 No connection
15 No connection 16 TRACEDATA[23]
17 No connection 18 TRACEDATA[22]
19 No connection 20 TRACEDATA[21]
21 No connection 22 TRACEDATA[20]
23 TRACEDATA[31] 24 TRACEDATA[19]
25 TRACEDATA[30] 26 TRACEDATA[18]
27 TRACEDATA[29] 28 TRACEDATA[17]
29 TRACEDATA[28] 30 GND
31 TRACEDATA[27] 32 GND
33 TRACEDATA[26] 34 1V8 reference
35 TRACEDATA[25] 36 No connection
37 TRACEDATA[24] 38 TRACEDATA[16]
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