AutoFocus User’s Guide
36
©1989-2018 Lauterbach GmbH
Did the PowerTrace/preprocessor combination work for other targets? If yes, what has changed on your new
target board? Often messages such as
Trace test failed: not enough samples in the trace
or
Trace test
failed: pin connection error
might indicate the source of the error.
Also check the voltage level of the reference voltage on pin 12. It is used as a reference for all trace signals.
It should correspond to the amplitude of your trace signals. For some targets this might differ from the JTAG
signals. Pin 14 is used as reference for all JTAG signals in case the JTAG debugger is connected via the
trace preprocessor probe. One way of testing the voltage on pin 12 is by executing
Trace.THreshold VCC
and double-checking that the voltage displayed in
Trace.CONFIGuration
window is approximately 50% of
your target voltage.
12. Check
Try both settings for the termination voltage:
In most cases it is best to have the termination voltage connected during trace capture. However, for lower
frequencies and/or weak output drivers, it can be helpful to disable the termination. This feature is supported
by all preprocessors with AutoFocus technology.
Usually a not terminated signal will result in slower rise and fall times and it might have over and
undershoots. For AutoFocus preprocessors, you will notice the slower rise and fall times by a reduced data
eye size (white areas in the
Trace.ShowFocus
window):
Error message
Possible reason
Trace test failed:
not enough samples in the trace
•
Trace port not enabled
•
Buffers not enabled
•
Threshold out of signal range
Trace test failed:
pin connection error
•
Short-circuit between pins
•
Wrong connector pin out
•
Unsupported ETM mode
•
Trace port not enabled
Trace.TERMination ON
; Connect termination voltage during
; trace capture
Trace.TERMination OFF
; Always disconnect termination voltage
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