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Timing Acquisition Mode Field (Timing only)
Minimum Transitions Stored Normally, transitions occur at a
relatively slow rate. A rate slow enough to insure at least one sample
with no transitions between the samples with transitions. This is
illustrated below with time-tags 2, 5, 7, and 14. When transitions happen
at this rate, two cycles are stored for every transition. This means that
with 2 Kbytes of memory, 1 Kbytes of transitions are stored. You must
subtract 1, which is necessary for a starting point, for a minimum of 1023
stored transitions.
Maximum Transitions Stored If transitions occur at a fast rate, such
that there is a transition at each sample point, only one sample is stored
for each transition as shown by time-tags 17 through 21 below. If this
continues for the entire trace, the number of transitions stored is
2 Kbytes. Again, you must subtract the starting point sample which then
yields a maximum of 2047 stored transitions.
In most cases a transitional timing trace is stored by a mixture of the
minimum and maximum cases. Therefore, the actual number of transitions
stored will be between 1023 and 2047.
Storing Time-tags and Transitions
11–8
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