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Mictor 38 connector

The Mictor 38 connector is a 38-way 0.635mm pitch socket which supports JTAG debug, Serial Wire Debug, SWO trace, and up to 16-bit wide continuous-mode TPIU trace.

Warning

  • DSTREAM-ST captures up to 4-bit wide trace (TRACEDATA[0-3]).
  • The center ground pins of the Mictor socket must be solder-pasted on the same side of the PCB as the connector. If you do not solder-paste on the same side of the PCB as the connector, it might cause mechanical or signal integrity issues.

Typically, the socket used is a 2-767004-2 from TE Connectivity.

To use this connector with DSTREAM-ST, the supplied Mictor adapter must be used in conjunction with both the Arm JTAG 20 debug cable and the CoreSight™ 20 debug cable.

Figure 2-5 Mictor 38 connector pinout


Mictor 38 pinout table

Table 2-7 Mictor 38 pinout table

Pin Signal name   Pin Signal name
1 NC   2 NC
3 NC   4 NC
5 GND   6 TRACECLK
7 DBGRQ   8 DBGACK
9 nSRST   10 EXTTRIG (1)
11 TDO   12 TRACE_VTREF (2)
13 RTCK   14 DEBUG_VTREF (2)
15 TCK   16 TRACEDATA[7]
17 TMS   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 Logic 0 (3)
31 TRACEDATA[11]   32 Logic 0 (3)
33 TRACEDATA[10]   34 Logic 1 (3)
35 TRACEDATA[9]   36 TRACECTL (4)
37 TRACEDATA[8]   38 TRACEDATA[0]

Note

  1. The EXTTRIG signal is deprecated and not supported by Arm® Development Studio.
  2. Although the Arm CoreSight specification only supports a single VTREF (on pin 12), the DSTREAM-ST unit can support separate debug and trace VTREFs. If only TRACE_VTREF is powered, the DSTREAM-ST unit assumes that both debug and trace are to operate at that voltage.
  3. These signals are not used by the DSTREAM-ST unit. To maintain compatibility with other debug units, connect the signals to the appropriate power rails.
  4. The TRACECTL signal is not currently supported by the DSTREAM-ST unit because only continuous-mode TPIU trace is supported.
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