CRU meeting

Tuesday 29 Oct 2024, 09:15 → 10:15 Europe/Zurich

Presents: PiPPo, Tivadar, Erno, Julien, Olivier

* PiPPo
    * Still has the parallel flash issue on a given CRU, Tivadar will help
    * Jira ticket will be added about this
* LPSC
    * lpGBT tested downlink and uplink, with CDC fifo  used to adapt clocks  240 ↔ 320
    * lpGBT generator and checker are in the 240 MHz domain
    * Python was updated to support some of the lpGBT functionalities
    * tick problem, we should have a general one, instead of duplicating to the data_valid of gbt records
    * lpGBT emulator was ported in pure VHDL by Julien
* System
    * Pixel : packet detector 6 links per endpoint
    * 6.4GB/s per endpoint seems the limits (see datapath wrapper)
    * Pippo will test the datarate sustainability. We'll need to determine if it works with more CRU in FLP
* After Heavy ion, YETS starts (see attached to indico)
    * PiPPo will plug USB cable in all CRU
    * Beam back in March 2025
* Priorities
    * trigger interface for the lpGBT, in particular for Pixel that needs trigger signal
    * Discuss beginning of 2025 with users

09:15 → 09:25 General news

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))

Filippo

• Calendar of HI for 2024 (start 4th end 25th Nov)
• During EYETS 2024/2025 we should do some large scale tests with the CRU
• FOCAL PIXEL:
  • Datarates:  maximum 18 Gbps per RU (overhead included) --> 18x4 = maximum 72 Gbps per CRU (PCIx max bandwidth about 80 Gbps)
  • CRU limit 6.4 GB/s per endpoint
• During EYETS we should do some large scale tests. EYETS will start DEC2024 and end in MARCH 2025

09:25 → 09:45 Firmware updates on dev