Label Polarity Fields - HP 1660CS-Series User Manual

The Analyzer Format Menu

Label polarity fields

Channels assigned to a label are numbered from right to left by the logic
analyzer. The least significant assigned channel on the far right is numbered
0, the next assigned channel is numbered 1, and all other channels assigned
sequentially up to the maximum of 16 per pod. Since 32 channels can be
assigned to one label at most, the highest number that can be given to a
channel is 31.
Although labels can contain split fields, assigned channels are always
numbered consecutively within a label.
Label polarity fields
The label polarity fields, which are located just after the label, are used to
assign a polarity to each label. The default polarity for all labels is positive
(+). You change the label polarity by toggling the polarity field.
When the polarity is positive, 1 is high and 0 is low. When the polarity is
negative, 1 is low and 0 is high. All data as well as bit-pattern specific
configurations used for identifying, triggering, or storing data reflect the
change of polarity. Numbers use the appropriate logical encoding, but
waveforms and edges are still shown as logic levels – either low or high. In a
timing analyzer with the data inverted, the waveform display remains positive
true.
As an example, setting the logic analyzer to trigger on 0A hex with positive
polarity is the same as setting it to trigger on F5 hex with negative polarity.
The listing would show 0A with + polarity, F5 with - polarity. In the
waveform menu, if the waveform is defined as bus the waveform shown as
symbols inverts with a change of polarity. If the waveform is defined as
individual channels or is not using symbols, it is not affected by changing
polarity.
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