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Selecting the Sample
Period or Rate
S pecifying the
1
Trigger Condition
Trigger on Anything
Trigger on Pattern
You can select the sample period (or rate, if it's more convenient)
with the "sample" command. Valid periods in the standard mode
are between 10 ns (100 MHz) and 50 ms (20 Hz). Valid periods in
the glitch capture mode are between 20 ns (50 MHz) and 50 ms (20
Hz). The accuracy of the sample rate is that of the crystal oscillator,
approximately + /- 0.01%.
The command
sample period_is 10 nsec
sets the sample rate to once every 10 nanoseconds.
The "mode" and "sample" commands control the acquisition of
data, but they do not tell the analyzer when to acquire data. This is
done by using the "trigger" command to specifying a trigger
condition.
The trigger condition is the combined specifications of all labels
(that is, the pattern, edge, or glitch specifications for each label
ORed together to form the complete specification for the 16
external data signals).
The "trigger" command is part of the trace specification.
The default condition is to trigger on any activity on the probe
signals.
The command
trigger on anything
sets the analyzer to its default condition.
In this type of trigger condition, a specific set of signal activities, a
pattern, must be present in order for the trigger condition to be
met.
You specify a data pattern consisting of 1s, 0s, or X's (don't cares)
on one or more of the labels or label signals. The most significant
bit is probe signal 15, or the highest bit number for the label
<RETURN>
<RETURN>
Timing: Using the Analyzer 8-7
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