Figure 2-4 Clock Waveforms; Table 2-3 Traceclk Frequencies - ARM DS-5 Manual

Switching thresholds
The trace probe detects the target signaling reference voltage (VTref) and automatically adjusts its
switching thresholds to VTref/2. For example, on a 3.3 volt target system, the switching thresholds are
set to 1.65 volts.
Hot-plugging
If you power-up the DSTREAM unit when it is plugged into an unpowered target, or if you plug an
unpowered DSTREAM unit into a powered target, trace functionality is not damaged.
If you connect an unpowered DSTREAM unit to a powered target, there is a maximum leakage current
into the DSTREAM unit of ±10μA on any of the debug or trace signals.
Related concepts
2.1.1 JTAG port timing characteristics on page 2-23.
Related references
1.4.2 Target interface logic levels on page 1-20.
2.1 Signal descriptions on page 2-23.
2.1.2 Serial Wire Debug on page 2-25.
Related information
ETMv1 and ETMv3 architecture pinouts.
ARM 100956_0527_00_en Copyright © 2010–2012, 2015–2017 ARM Limited or its affiliates. All rights reserved.
Non-Confidential
2 ARM DSTREAM Target Interface Connections
Tperiod
Twh Twl

Figure 2-4 Clock waveforms

Table 2-3 TRACECLK frequencies

Parameter
Tperiod (min) 2.08ns
Twh (min)
Twl (min)
2.1 Signal descriptions
DSTREAM Description
Clock period
1.0ns High pulse width
1.0ns Low pulse width
2-27