| 摘要 |
<p>A method and apparatus are disclosed which provide for the generation of a trigger signal responsive to the detection of a plurality of selected sequential events in a single monitored signal. A plurality of trigger detect devices operate independently to monitor a signal for the occurrence of selected trigger criteria, and produce indications thereof having selected durations. The duration of the indications function to provide continuous indications of the occurence of the selected trigger conditions over the periods thereof. In one embodiment, a state machine delays each of the indications by an amount of time approximately equal to the time between the respective events and a final event in the sequence, thereafter combining the indications according to preselected logical operations. As a result of the delays, the indications from the trigger detect devices are combined at approximately the same time. The duration of the indications operate to preclude timing differences between events from preventing detection of the series of selected sequential events. In an alternate embodiment, the state machine operates to combined information from the trigger detect devices in a serial fashion according to pre-selected logical operations and delayed by selected time periods to produce the desired trigger signal. Timing differences between sequential events are again precluded from preventing detection of the series of selected sequential events by the duration of the continuous indication produced by each of the trigger detect devices.</p> |
