ARM DSTREAM-ST - Trace signals

Table 2-4 CoreSight 20 signals (continued)
Signal I/O Description
VTRef Input The Voltage Target Reference pin supplies DSTREAM-ST with the debug rail voltage of the
target to match its I/O logic levels. VTRef can be tied HIGH on the target.
Note
If VTRef is pulled HIGH by a resistor, its value must be no greater than 100Ω.
GND - Ground.
KEY - This pin must not be present on the target connector.
2 ARM
®
DSTREAM-ST target interface connections
2.2 About the CoreSight
™
20 connector pinouts and interface signals
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