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Example of two-level batching event builder (BEB) in the FEB and KCU:

FEB segment a batch"a" event-build for event 1 with two detector segments a,b and a timestamp t1: t1,d1a,d1b event-built into "f1a"
FEB segment b batch"b" event-build for event 1 with two detector segments c,d and a timestamp t1: t1,d1c,d1d event-built into "f1b"

KCU batch event-build for event 1: f1a,f1b (static size for HR, UHR, but variable for sparkPIX).  Note that this is a partial event-build because other detector segments will be connected to other KCUs.  Existing LCLS software does that high-level event-build.

Note: will always get a packet from sparkpix from empty payload