HP 16550A User Reference page 49

100-mhz state/500-mhz timing logic analyzer
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Timing Acquisition Mode Field (Timing only)
In this case, transitions are being detected with each sample. Therefore,
they are all being stored. In addition, each sample pair contains a transition.
For example, time tag 1 (100/000) contains a transition and is different from
time tag 2 (111/011), which also contains a transition. The difference
between the two will trigger the transition detector.
If this were to continue throughout the trace, You would store 4 Kbytes −1
transitions, or 4095. As with the 125-MHz mode, the actual number of
transitions stored will fall somewhere between 682 and 4095, depending on
the frequency of transitions.
Other Transitional Timing Considerations
Pod Pairs are Independent In single run mode each pod pair runs
independently. This means when one pod pair fills its trace buffer it will
not shut the others down. Should you have a pod pair with enabled data
lines and with no transitions on its lines, you get a message "Storing
transitions after trigger for pods nn/nn." In repetitive run mode, a full
pod pair waits 2 seconds, then halts all other pod pairs.
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