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Coupled Deadtime Behavior

NOTE: We believe we can't make coupled-deadtime work in an ideal way as described here: Bypass Events

Matt has implemented "coupled" readout-group dead time behavior on the XPMs (can be enabled/disabled with register settings).  This behavior is done this way to ensure that Ric's TEB is always guaranteed to get a highest-rate readout group in every event, which dramatically simplifies his TEB system design.  The trigger decision ("Tr") works like this for 3 readout groups, highlighting the cases when (a) the highest-rate readout group is full and (b) one of the lower rate readout groups is full, both when that group wants to readout and doesn't want to readout.

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