Page History

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• there are 288 bits of "event codes" available
  • some have well-defined meanings, like the low-rate ones described above (in progress)
  • 16 highest bits are hutch specific for sequences (272-287)
  • DAQ readout groups are "extra bits" included at end of timing frame
• timing frames have "destinations": e.g. bykiks, and bykikh both go to "bsy" dump
• unlike LCLS1 we will not be using event-codes to understand when bykiks has fired: use destinations instead, in particular DumpBSY for "dropped" or "background" shots
• some devices reference to "sequencer engineer number" and "sequence bit number" instead of "eventcode".  The formula to convert between the two: eventcode=(sequenceEngine#<<16 | sequencerBit#).

Trigger Destinations and Types

Timing receivers share a common logic module for generating triggers.  They consist of the logical AND of two components, a rate component and a beam destination component.

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