Level-1 Missing Energy Significance Trigger Specification

Transcription

1 Level-1 Missing Energy Significance Trigger Specification Steve Hillier with significant contributions from Ian Brawn, Diego Casedei, Norman Gee, Murrough Landon, Alan Watson 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 1

2 I m not going to talk about: Motivation See Diego s talks Specification and firmware details See file attached to agenda Also Ian Brawn s talk on Monday: Details of manpower, timelines, testing I ve just spent 1 week writing all this in the specification If you re interested, read it! One brief comment the workload is high and the schedule is tight 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 2

3 What I will talk about: Interfaces This is what really impacts people outside L1Calo CTP output RoI format changes Trigger Menu requirements Level-1 XS definition Some points for discussion Potential for other modifications 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 3

4 Output to CTP Just one L1Calo output/ctp input cable is affected Used to contain 4 x TE bits, 8 x XE bits Now will contain 8 x TE bits, 8 x XE bits, 8 x XS bits Should be relatively easy for CTP to handle this But note that old bits (XE) have been moved as well as bits added Description in Trigger Menu must be updated Will need a re-timing exercise of real-time signals to CTP Pair 33 Cable 0 Pair 0 G D P C 8b MET-Sig Hit 8b EtMiss Hit 8b Sum Et Hit 7b Reserved K Map Map Map Clock Parity Signal Ground 14-Dec-10 CMMCablefmt.xls/esum_cmm-ctp 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 4

5 New RoI data format Fortunately just an addition, no existing data has changed Extra information consists of 8 new XS hit bits 4 additional TE bits Will require extra decoding for Level-2 RoI Type P P P 0 or exactly 3 Energy RoI words 8b Miss-ET-Sig X 3*0 15b Signed Ex Hits O Y 3*0 8b SumET 15b Signed Ey O 8b Missing-ET T 3*0 15b Unsigned SumEt Hits O Parity Error Ex, Ey, Et Overflows RoI Type One of 0-many CP RoI words 2b 4b 3b 3b 8b electron/tau 8b electron 0 0 P S C CPM Chip LC Thresholds Thresholds Crate CPChip Saturation Local Coords Parity Error RoI Type 0 or more Main Jet RoI words 4b JEM 3b 2b C 0 P S 4*0 4*0 No Frm RL 0 or more Forward Jet RoI words 4b JEM 3b 2b 4b Fwd C 1 P S 4*0 No Frm RL Jet Thr Crate RoI Frame RoI Local Coords Saturation Parity Error 1=Fwd 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 5 RoI Type P RoI Type Parity Error P 3* P 3* P 3*0 0 or 1 Jet-ET RoI words 0 or exactly 3 Energy RoI words 8b Miss-ET-Sig X Hits O 15b Signed Ex Y 8b SumET O 15b Signed Ey 8b Missing-ET T Hits O 15b Unsigned SumEt Parity Error Ex, Ey, Et Overflows CP Local Coordinates JEM Frame JEM Local Coordinates (0,1,0 (0,1,1 (1,1,0 (1,1, (0,0,0 (0,0,1 (1,0,0 (1,0, Dec-10 24* b Main Jet Thresholds 8*0 4b Jet ET Slinkfmt.xls/ROD RoIs

6 Trigger Menu Additions Four extra TE thresholds Please give them values, even if they aren t used Forced Threshold mechanism (we like it) We also requested many times that all thresholds are size ordered This was not true for the Heavy Ions Menu for XE thresholds Eight entirely new XS thresholds Several parameters to drive Level-1 XS calculation Two constants in Diego s favourite XS formula: XE min/max value for XS validity XE < min, all XS set to false MET XE > max, all XS set to true METSig = TE min/max value for XS validity a SumET TE < min, all XS set to false TE > max, all XS set to????? ( b) 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 6

7 Min/max bounds on XS XE min/max XS always off below min XS always on above max Has to happen at 63 anyway Fair enough sqrt(te) min/max Not sure if this makes sense? Just let XS do its job? 63 Forbidden XS always true XS thresholds XE XE min/max TE min/max XS always false 0 Sqrt(ET) 63 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 7

8 On a slightly different topic: Virtual Jet Thresholds Received wisdom: There are only 4 FJ thresholds but 8 J thresholds The truth: The JEM implements 8 of both thresholds But we only have backplane bandwidth to send 4 to the CMMs and CTP It would be easy to include the 4 additional bits in the jet RoI information I.E. We could implement 4 extra virtual FJ thresholds at little extra effort By that I mean for next year Question, should we do it? In fact if we d been given warning, we might even have been able to send the 0.8x0.8 energy in the RoI I believe it s far too late to do this for 2011 now Especially since we re now flat out working on MET Significance But could have been a different story if we d been alerted earlier 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 8

9 The moral Don t think of Level-1 as fixed and unchangeable Particularly in 2012 shut-down we could make radical firmware updates if useful But firmware requires time and iteration So give us fair warning Diego did this, though only just! Talk to us about what you think might be useful Some things are easy, others require time and thought See Mimmo s talk at Amsterdam 15/12/2010 Level-1 Missing Energy Significance Trigger Specification 9