FED Design and EMU-to-DAQ Test

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FED Design andEMU-to-DAQ Test
J. Gilmore CPT Week DAQ Presentation Feb. 10, 2005
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FED Crates (in USC55)
optional

• FED board dimensions are 9U x 220mm deep
• EMU will have 4 FED crates (2 for each Endcap)
• 9 DDUs plus 1 or 2 DCCs in a FED crate
• Each DDU reads out 13 CSCs 200 sector of Endcap

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DDU Data Inputs
DDU Data Inputs

• Each DDU reads out a 200 slice of Endcap -
  13 CSCs (or 13 DMBs)
• CSC sectors are rotated between stations to
  equalize input data rate between DDUs

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Custom Backplane for FED Crate
Designed for 9 DDU to 1 DCC or 2 DCCs Each DCC
can send data on 1 or 2 SLINKs Can accommodate
various data concentration ratios 9 DDU to 1
SLINK - EMU data on 4 SLINKs 5 or 4 DDU
to 1 SLINK - 8 SLINKs
(baseline plan) 3 or 2 DDU to 1 SLINK -
16 SLINKs (for S-LHC?) 1 DDU to 1
SLINK - 36 SLINKs
(for SS-LHC?)
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DDU Prototype

• Functions
• Merge data from 13 DMBs
• Perform error checking and status monitoring
• (CRC, word count, L1 number,
  BXN, overflow, link status)
• Communicates w/FMM
• Large Buffer Capacity
• 2.5 MB buffer
• Average DDU data volume estimated to be 0.4kB per
  L1A at LHC (_at_1034 lumi)
• Buffer can hold over
  6000 events
• TTC signals from DCC
• Slow control via VME

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DCC Prototype

• Data Concentration
• Merge data from 9 DDUs
• send merged data to central DAQ via 1 or 2 SLINKs
  
• Has two optional GbE spy data path
• Fast Control
• Receive TTC fiber signals using TTCrx,
• Fanout L1A, LHC_clock and other TTC signals to
  DDUs
• Has optional FMM interface

GB Ethernet output
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EMU-to-DAQ Test Plans

• Can CMS DAQ be used for EMU readout?
• What rate can DAQ handle?
• SLINK readout limitations (crate location cable
  length)
• Where does data go?
• On-line checks? Data storage? Where how much?
• What rate can EMU provide?
• Use cosmic triggers, calibration pulses/fake
  data, or both?
• Before March 17 is good
• Current EMU FED system prototypes are available
• Fully compatible with final production system
• March 21 April 12 is not so good.
• EMU FED production work requires experts at OSU
• April 14 or later?
• Some new EMU FED boards will be available