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Timing of the Trigger Path

Timing of the Trigger Path. Calorimeter Commissioning meeting 25 June 2008. Outline : Reminder Alignment test of ECAL-HCAL-PRS-SPD data in TVB PreShower timing processing revisited SPD-CB case. Eric Conte. Reminder. ECAL/HCAL. Herve. PreShower timing processing revisited.

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Timing of the Trigger Path

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  1. Timing of the Trigger Path Calorimeter Commissioning meeting 25 June 2008 • Outline : • Reminder • Alignment test of ECAL-HCAL-PRS-SPD data in TVB • PreShower timing processing revisited • SPD-CB case Eric Conte

  2. Reminder ECAL/HCAL

  3. Herve

  4. PreShower timing processing revisited Photo de la carte Front-End Herve fully simulated the TRIG-PGA (rooting step not included). Internal structure has been improved (safety options) : BOTTOM and LEFT neighbour generation need, each another, 2.5 clock cycle more. Known since building 156 common tests Need to measure the “real” timing with a scope/logical analyzer

  5. Two strategies can be used for determining the PRS/SPD latency for ECAL data : • According to BCID values : • Synchronize ECAL trigger BCID with the DAQ BCID (do the same for PRS/SPD trigger BCID) • Aligning ECAL data with PRS/SPD component consists in aligning BCID values. • (same method used for ECAL & HCAL, see 22th April Patrick’talk) • According to data values : • Delay RAMs injection, triggered by a L0 signal, in order to compensate the different latencies before injection RAM. • Aligning the different data by injecting RAM. HCAL TVB ECAL PRS/SPD ECALpipeline ECALpipeline HCALpipeline PRSSPDpipeline TVB input alignment can be done easily by acquiring data/BCID with EPPI & HCAL spy RAM

  6. Determination of 2 delay : • ECAL data in PRS trigger • PRS/SPD/ECAL/HCAL in TVB RAM  RAM • Envoi a la DAQ ECAL : 339 • Envoi a la DAQ PRS : 552 • 8.5 coups L0LAT PRS = 135 L0LAT ECAL = 147  12 coups HCAL Expected : Measured : ECAL ECALpipeline PRS/SPD Expected ECAL dans TVB : 691 Expected PRS dans TVB : 1107  Delta = 16.6 ECALpipeline Expected PRS RAM injection : 402 Expected ECAL RAM injection : 277  Delta = 5 Expected PRS RAM injection : 25 Expected ECAL RAM injection : 746-277=18.6  Delta = 6.5

  7. SPD

  8. Summary & perspectives The main task of the 2 last weeks : aligning PRS/SPD with XCAL in the TVB • The PRS TRIG-PGA timing model has been revisited and is now well understood by the users : the trigger processing required more 6 clock cycles than the previous expectations. • Delay between PRS & ECAL in TVB has been performed in 2 steps : • before RAM injection : + 5 clock cycles expected (need to be confirmed) • after RAM injection : + 12 clock cycles, expected & measured • A delay of 17 clock cycles is needed (TVB cannot currently compensate it) • Possibilities to reduce this delay without programming the component : • use TVB pipelines instead of FE-PGA pipelines : 17  14 clock cycles

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