CountingDaq 210915

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Meeting information

 Meeting time:  3:00pm Eastern
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  • Activity updates
    • Discussion of requirements document and ICDs
    • Continuing discussion of SRS to readout GEMS instead of MPDs - Chandan docDB791
  • General discussion


Meeting recording on [1]

Participants: B. Moffit, R. Michaels, D. Armstrong, P. King, C. Ghosh, H. Liu, J. Fast, M. Goodrich, R. Radloff

  • Bob had put together the drafts of the interface control documents and requirements documents
  • Discussion of SRS system
    • SRS had been tested using APV chip, but can use other readout chips. The SRS uses a different card for the APV chip, so is not a direct replacement for the MPD readout.
    • The SRS frontend cards can support 1 Gbit/s; the SRU supports 10Gb/s, so higher rates are possible with more than one FEC
    • The SRS also seems to multiplex the analog data with the digital data on the HDMI cables.
    • SRS seems to use more HDMI cables to connect to the APVs than the MPD connections.
  • Discussion of using the APV+MPD system
    • Maybe we can make the APV->backplane connection more robust by using more of the boltholes in the current APV card design.
    • This would need a redesign of the backplane; we may need to do this anyway.
  • In writing the requirements document, we should be speaking to the functionality rather than the specific implementation
  • What is the plan to decide upon the GEM readout
    • Prototype an improved backplane
    • Test HDMI cable length for APV->MPD
    • Compare to system performance in SBS
  • David will work on a statement of what are our timing requirements