ARM DSTREAM-ST System And Interface Design Reference Manual page 24

Signal I/O
VTRef Input
GND -
KEY -
ARM 100893_0100_00_en
Description
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.
Ground.
This pin must not be present on the target connector.
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2 ARM DSTREAM-ST target interface connections
®
2.2 About the CoreSight 20 connector pinouts and interface signals
™
Table 2-4 CoreSight 20 signals (continued)
2-24