June 17, 2024

With Ryan, Larry, Mudit, Ric, Gabriel, cpo

...

• LCLS would like a GPU-enabled TDet firmware (timing system triggers a fake-payload of user-defined size)
  • generates fake payloads 
  • Ryan said : that TID needs to come up with a block-diagram for this
• For real detector: LCLS would like multiple detector lanes (8 for kcu) built by the Batching EB in in kcu1500 firmware
  • this is separate from the BEB on the FEB which joins timing to data 
  • a "partial" event builder (detectors still split 
  • this is currently done for epixHR (we think the old pre-existing timing-stream is disabled in the KCU BEB)
  • Mudit could modify the existing epixHR kcu1500 firmware, but eliminate timing system and expand to 8 data lanes
  • could we eliminate the front-end BEB to avoid a level of tail-iteration?  Ryan thinks maybe even could avoid the kcu tail-iteration somehow

...

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

July 1, 2024

• we think gpu can write to kcu, but Jeremy will try to confirm that this is really the case.  we think kcu to gpu is broken.
• Mudit will work on TDet firmware
• Jeremy and TID will use rdsrv419
• LCLS should find another machine where we can control the root-complex topology better.  lab3 daq-tst-dev06?
  • could be that the CPU datadev driver is incompatible with the GPU datadev driver
  • should probably find a different machine.  a fee-alcove machine?
• chris and gabriel on vacation July 6-20
• Jeremy unavailable July 8-10