DAQ Testing/20181114

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Back to Main Page >> DAQ Documentation Portal >> DAQ Testing >> DAQ Commissioning Notes

Old-Example Timing Diagram, Injector, FLEXIO - Contains all Helicity Signals

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November 14th, 2018 Testers: Bob, Cameron, Paul King, Amali

See Today's Meeting Notes

Goals

Fix the timing in the SIS3801 so that it latches LNE before the present event's helicity information are read out, instead of whatever was going on before that did not match the diagram given in [[

FLEXIO Scaler

New setting, delays FLEXIO latch LNE

The FLEXIO scaler is used to count all of the helicity related information in 4 input channels, with a 100 us delayed (50 ns long) Tstable used to latch LNE, needed to correct helicity sequence errors

  • Channel 0 = HEL+
  • Channel 1 = HEL-
  • Channel 2 = MPS/QRT/MultiSync
  • Channel 4 = Pair Sync
  • All channels are the standard helicity information with no surprises
  • New-Timing Diagram, Injector, FLEXIO

Was, as of 11/6/2018 test

The FLEXIO scaler is used to count all of the helicity related information in 4 input channels, with Tstable was used to latch LNE

  • Channel 0 = HEL+
  • Channel 1 = HEL-
  • Channel 2 = MPS/QRT/MultiSync
  • Channel 4 = Pair Sync
  • All channels are the standard helicity information with no surprises
  • Old-Timing Diagram, Injector, FLEXIO

Results

  • We changed the FLEXIO latch LNE to be delayed until after the prior event was read out, adding a new delayed Tsettle with a 100 us delay and 50 ns gate length (irrelevant).

To Do

  • It turns out that the timing diagram for the SIS3801 appears to conflict with the readouts, in that it looks like the SIS3801 is reading the current event (like the FLEXIO has now been changed to be, when it is supposed to be reading the prior one.
  • We should double check the old timing diagram and fix the delay if the drawing was drawn wrong, and figure out what is going on with the helicity information if the drawing is correct (since it seems to be behaving differently).