Introduction
QT
RACE
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U
SER
M
ANUAL
© 2018 PDQLogic Ltd.
QTrace User Manual Rev 1.01
Page 9
1.9
Front panel status LED
The bi-colour front panel LED conveys the current status of the QTrace probe. Below is a summary of
the possible states:
Colour
QTrace State
Red
Trace decoder hardware is unconfigured
Red flashing
No trace clock detected or unable to synchronise with trace data
Green
Streaming trace data
Green flashing Trace data has stalled e.g. break point hit
Table 3 Front panel LED states
1.10
Precautions
There are several issues to be aware of when using the QTrace probe:
1)
Do not connect a powered target processor to an unpowered QTrace probe i.e. when it isn’t
connected to a PC via a USB 3.0 lead. Doing so will cause internal ESD diodes to continuously
conduct which may damage them. It may also damage the trace pins on the target processor.
2)
The QTrace probe should not be connected to a USB 3.0 lead greater than 2 metres long. The
lead should have high frequency ferrites at both ends as per the supplied lead.
3)
Do not force the USB lead connector into the QTrace probe. If it does not mate easily then the
USB lead connector may be damaged and the lead should be replaced.