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AutoFocus User’s Guide
38
©1989-2018 Lauterbach GmbH
Advanced Checks
1. Check
Make sure that you have completed the
basic check
list.
Especially do not forget to execute
Trace.AutoFocus
after setting up your trace port with the frequency you
wish to trace and before attempting to trace signals.
Do you get any error or warning messages? For very high frequencies you may need to repeat this
command until the hardware configuration is successful.
2. Check
What is your target voltage? For AutoFocus preprocessors with pluggable termination module: is the proper
termination PCB plugged in?
For further information, see
External Termination PCB (shipped before 2006)
.
3. Check
Use the PowerTrace-AF Diagnosis tool for preprocessors with AutoFocus technology to read in the current
state of the driver software / preprocessor. (See
Access the Diagnosis Tool
.)
After executing commands that might change the state of the preprocessor
(e.g.
Trace.AutoFocus
), use the
Refresh
button to load current values from the low-level driver into the diagnosis window.
Press the
Measure
button if you want to repeat measurements like the target voltage, frequency etc.
The
Info
button will display even more detailed information and also generate a log file.
Clock and data reference voltage should normally be somewhere close to 50% of the target voltage.
Termination - Bus A / Bus B (unplugged indicates that no termination is connected).
Check the stability of your target voltage by pressing the
Measure
button a couple of times. Check the
minimum and maximum values that were measured for that session by pressing the
Info
button:
The trace clock frequency does not necessarily equal the CPU clock frequency.
For example, an trace port operating with double data rate results in an trace
clock frequency that is half the CPU clock frequency, another trace port
operating with quad data rate results in an trace frequency that is a quarter of
the CPU clock frequency.
The frequency measurement might not be very accurate for frequencies below
20 MHz.