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    CRU meeting

    → Europe/Zurich
    CRU meeting
    Zoom Meeting ID
    61138975087
    Host
    Olivier Bourrion
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    ### General 
    * Focal has the hardware for the pads (data concentrator, 2 lpGBT on one PCB)
        * clock recovery is OK
        * next step data sanity checks
    * A box of CRU not working, about 5 boards
        * TPC (minipod communication issue)
        * TRD, pon issue
        * 2 general use (opical link issue)
        * Serial flash problem (we do not use this anymore)
    * Also a parallel flash issue (TPC usage)

    ### Specification
    * OK for circulation
    * For now in gitlab cru-fw
    * Olivier open a directory, PiPPo load the figures, and we create the PDF
      
    ### lpGBT issues, when in TTC clock
    * no FEC errors, but error in data !!
    * Many checks everywhere, PiPPO sees no issues
    * No problem in constant pattern, but there are in counter and PRBS
    * legacy GBT, with TTC tree, works in lab
    * lpGBT with mockup fails
    * RX calibration fails on TTC PON sometimes 5 times in row
    * IC configuration
    * The FEC error monitor is in a dedicated branch (#422), we need to merge in develop ASAP
        * Thus Erno can use it as well (rebase on develop needed)
    * We do more test to understand better what is going on
    * In july a new TB for Focal, more extensive
    * ** We need to double chk firmware test with a LTU test**
    * lpGBT IC not working even in local
        * see Erno' email from 20 april 2026
        * Now with lpGBT V2 and new hardware it is not working at all => live in meeting, seems to be I2C hardware

      TODO:
      * Bring specification in gitlab (Olivier, and Pippo for figure), build PDF and distribute it to alice-cru
      * Rebase 422 and merge (PiPPo)
      * See how many CRU can be salvaged from the box in Alex's office and the TPC CRU
      * Use same base for FOCAL TB (request to use EP2) => Erno
      * Gather more information with LTU usage (PiPPo and Erno) 

    There are minutes attached to this event. Show them.
      • 14:00 → 14:10
        General news 10m
        Speakers: Erno David (HUN-REN Wigner Research Centre for Physics (HU)), Filippo Costa (CERN), Julien Si-Ming Bounmy (Centre National de la Recherche Scientifique (FR)), Olivier Bourrion (Centre National de la Recherche Scientifique (FR))
      • 14:10 → 14:30
        Validation of specification documentation for circulation 20m

        https://cernbox.cern.ch/s/L2pMlFd4SmlQfiZ

      • 14:30 → 14:50
        lpGBT issues in remote clock 20m

        https://cernbox.cern.ch/s/B1LUzKKqZ7fcGJc

        test with local/ttc clock

        Summary of the tests done so far (lpgbt version).

        • local clock. All good
        • ttc clock.
          • some time RX doesn't calibrate
          • the IC operations works, but with some errors
          • all the links (lpGBT and TTC) are ok!! Error counters are 0
          • loopback checks work only in CONSTANT PATTERN, otherwise FEC is 0x0, but the DATA is bad

        [NOTE]
        in the past the new clocking tree was tested in legacy GBT mode at P2 on many CRUs doing loopback test.
        Could it be that the issue was present also there but doing internal loopback we didn't see the error?
        If we want to repeat similar tests we are doing in lpGBT I need to generate a stream from the FEE ... I might be able to do that at the end of RUN3 (~1 month) using some detector FEE.