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Electronics & DAQ WG: Timing protocols, the follow up meeting

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Wiki :

DAQ - EIC Project Detector Collaboration (bnl.gov)

Mailing list :

https://lists.bnl.gov/mailman/listinfo/eic-projdet-daq-l

https://lists.bnl.gov/mailman/admin/eic-projdet-daq-l

eic-projdet-daq-l@lists.bnl.gov 

Mattermost : join det1-daq channel 

  https://eic.cloud.mattermost.com/signup_user_complete/?id=i8gnmob4stdrpjfrezhegxs3ew

Digitization table link

https://docs.google.com/spreadsheets/d/1s8oXj36SqIh7TJeHFH89gQ_ayU1_SVEpWQNkx6sETKs/edit?usp=sharing

Project information link

https://wiki.bnl.gov/EPIC/index.php?title=Project_Information

Cables and service spreadsheets subdetectors

 

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Passcode: 8fHo73t?

 

Announcements

Coming reviews

  • June 10-14: DAQ review. charged by the project. Including eRD109, FDR of VTRx, and lpGBT. 
  • In few weeks: RDO review. Internal technical review on ongoing RDO design and prototyping work. 

 

Use a beam pickup signal in ePIC? - Wiliiam Gu

William: LHCb observed beam clock drift (14ns) relative to bunch crossing; Proposal correcting time-dependent beam clock drift relative to the bunch timing using a beam (bunch RF?) pickup 

Jeff: From the EIC common platform to GTM, the cabling is a few meters in a climate-controlled DAQ room. The drift is expected to be small from the cabling. 

Jeff: EIC common platform expects to deliver 5ps (jitter + phase shift) stability. To be followed up with control group. 

Elke/Tonko: not expecting this to be an issue. 

Action item: follow up with EIC control group on the specification of the quality of the delivered clock. 

 

Timing protocol specification follow up discussion - Jin Huang

Topic 1: BCO embedding in GTU->DAM link? 

Consensus: 

  • GTU keep a 64bit BCO master clock
  • Use current proposal of (8Byte * 8b10b * 98.5MHz) GTU->DAM link as v0.1 specification, so test can start to find out where to change/improve 

Concern: 

  • William concerns using much of the link to distribute BCO counters is an overkill 

 

Topic 2: MGT based GTU->DAM links? 

Consensus:

  • Use ~120 MGT-based GTU<->DAM links, which simplify feedback signal and provide most flexibility

Action Item: 

  • Pick a commercially available board to start prototyping 

 

Topic 3: Unlink DAQ Time-Frames from Beam Revolution? 

Consensus:

  • <=2^16 crossing: 16-bit integer sufficient to locate hit’s BX in Time Frame; <=665us/300 events/10MB 
  • Exact length defined by GTU sync signal: most flexible
  • Don't have to be sync Time-Frame to beam revolution
  • Timely to put first specification given to be used in on-going RDO ASIC prototyping 

Action Item: document this discussion in v0.1 timing protocol specification documentation. To share within the week. 

 

 

 

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