View source for CountingDaq 210120

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== Meeting information ==
  '''Meeting time:'''  2:00pm Eastern
    
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== Agenda ==
*  Follow-up from last meeting
**  Chandan:  discrepancy with Nilanga's channel count [https://moller.jlab.org/DocDB/0006/000683/003/MOLLER_CountingDAQ.pdf docDB 683_page12-13]
**  Paul:  rough estimate of data rate based on occupancy guesses --- [https://moller.jlab.org/DocDB/0006/000685/001/moller_counting_daq_20210120.pdf DocDB 685]
*  General discussion


==  Minutes ==
Participants:  B. Moffit, C. Ghosh, H. Liu, R. Michaels, J. Fast, P. King

*  Follow-up on discrepancy between Chandan's and Nilanga's channel count:  Chandan had used the dimensions in the CDR, which are out-of-date and a little larger than current.  Using the current dimensions resolves the discrepancy in channel count.  There will be 1280 channels per module.
*  Data rate estimate discussion
**  Bryan says that the data suppression is done in the SSP rather than in the MPD.  The links from MPD to SSP can support 1Gb/s.
***  Based on the calculations in DocDB 685, we'd currently expect ~0.65 Gb/s from each MPD (for 3 samples per trigger at 7kHz trigger rate)
***  Bryan mentions that they are working to get 2 Gb/s links from MPD to SSP for SBS
**  Chandan reminds us that the data from the MPDs includes headers, although these are a smaller fraction compared to the actual samples
**  Open question about occupancy
***  Chandan reported that the PREX GEM modules had about 8-9 strips above pedestal for each track (total for both X and Y planes in the module)
***  Chandan will check in simulation what the particle rate at the GEM modules will be
*  Developing the DAQ design
**  Bob reminds us that the preliminary design review milestone is mid-March, with the counting mode DAQ design to be complete in June.
**  Bob will be in charge of defining the reviews
**  Expect that the review will take ~1/2 day