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Processing for Data
Determining Intervals
The "process_for_data" command is a way to limit the samples
displayed on the trace list. As with the "find" and "mark"
commands, a simple or complex set of conditions can be specified.
You can display only samples that have been previously marked,
specified new conditions for the display, or display samples a set
number of samples after a new condition. The "process_for_data"
command definition is also retained, like the "mark" command
definitions, for post processing.
The command
process_for_data marked
displays all previously marked data on the trace list. The command
process_for_data sampled 10 samples_after
pos_transition_on X_lower .2
displays only trace samples that are ten samples after any positive
(from low to high) transition on bit 2 of X_lower. The amount of
time represented by the ten samples is dependent on the sample
rate. Therefore, if the sample period is 10 nanoseconds, the
samples displayed will be 100 nanoseconds after the positive
transition.
Both the timing diagram and the trace list display the time interval
between the mark_x and mark_o points. Therefore, the simplest
way to determine an interval between two events is to mark the two
events of interest with mark_x and mark_o, and then read the
interval from the display.
If the events are not already marked, simply move the cursor to the
event of interest and position one of the marks at that point using a
command like
mark x
<RETURN>
The command
mark x on_cursor
"attaches" the mark to the cursor. You can then move the cursor to
the desired location, and use
mark x
<RETURN>
to position the mark at its current location.
<RETURN>
<RETURN>
<RETURN>
Timing: Using the Analyzer 8-25
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