DAQ Testing/20181114
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November 14th, 2018 Testers: Bob, Cameron, Ye Tian
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 Old-Timing Diagram, Injector, SIS3801
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).
