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nSW Readout

nSW Readout. Tony Liss, Ric Claus Rainer Bartoldus , Nicoletta Garelli , Mike Huffer, Martin Kocian, Todd Moore, Su Dong, Charlie Young. Basic Requirements. Upon receipt of a L1A, the MM and sTGC data must be de-serialized, error-corrected, and formatted. (Feature extraction?)

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nSW Readout

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  1. nSW Readout Tony Liss, Ric Claus Rainer Bartoldus, NicolettaGarelli, Mike Huffer, Martin Kocian, Todd Moore, Su Dong, Charlie Young

  2. Basic Requirements • Upon receipt of a L1A, the MM and sTGC data must be de-serialized, error-corrected, and formatted. (Feature extraction?) • Formatted MM and sTGC data must be output via S-link to TDAQ. • DCS & Monitoring/Calibration data must be received and distributed. • TTC signals must be received, processed, and distributed. • The VMM2 must be configured and controlled. • The nSW readout must be forward compatible with Phase 2.

  3. Data Volume VMM2: 32 bits/hit MM: 1% occupancy ~2 hits/VMM/L1A, sTGC: 2% (?) occupancy ~4 hits/VMM/L1A L1A @ 200 KHz  13 Mb/s per MM VMM2 , 26 Mb/s per sTGC VMM2 • Channel counting: • MM: 2,097,152 channels32,768 VMM2 • sTGC: 1M channels (?)  16,384 VMM2 • Total data volume: 800 Gb/s for MM+sTGC This assumes 32 bit word for sTGC. Is that true?

  4. GBT Link • 4.8 Gb/s with 3.2 Gb/s user data • From Ken J: 128 VMM2/GBT  256 GBT • MM: 13 Mb/s x 128 = ~1.6 Gb/s • sTGC: 26 Mb/s x 128 saturates the GBT • Assuming same bandwidth out as MM, then half as many VMM/GBT  256 GBT for sTGC too.

  5. COB • Cluster-On-Board: An ATCA Front Board • A network cluster interconnect • On-board 64 port 10 GE network switch • Configurability allows 1 GE, 10 GE per port or 40 GE XAUI • Extends over the full-mesh backplane to other COBs • 8 SFP+ transceivers provided on the front panel • A carrier of 8 general purpose RCEs • One additional RCE for board management • Potential expansion for DCS duties • A timing distribution system • Can source as well as receive TTC information • Distributed over the dual-star backplane • A BUSY signal aggregator • Distributed over the dual-star backplane

  6. Preproduction COB • Differences between pre and production COB • Move SFP+ from RTM to Front-Board • Move IPMC onto DTM • Break up FTM into two different boards • Move resulting base-board next to P2

  7. Design 1: RCE configured for 5 inputs, 1 output. . . . . . RCEOUT 4 RCEOUT 3 RCEOUT 2 RCEOUT 1 GBT 1-5 GBT 16-20 GBT 11-15 GBT 6-10 RCEout 52 GBT 251-256 RCEIN 2 RCEIN 3 RCEIN 4 RCEIN 1 RCEIN 52 . . . . . . . . . . . . . Ethernet Interconnect . . . . . S-link to ROS

  8. Design 2: RCE configured for 3 inputs, 3 outputs GBT ROL 4.8 Gbps 4 Gbps GBT RCE ROL GBT ROL X 8 for each COB

  9. Design 1 vs. Design 2 • 5 GBTs/(2 RCE) 8 RCE per COB 256+128 GBTs 14 + 8 COBs • 1 ATCA crate each for MM+sTGC • Flexible: Easy to accommodate changing design metrics • Higher speed ROLs • Static or dynamic mapping of inbound to outbound links • On-board data processing available. • Existence proof from CSC • 3 GBTs/RCE 8 RCE per COB 256+128 GBTs  11 + 6 COBs • 1 ATCA crate each for MM+sTGC • Fixed relation between inbound and outbound links • Simple design

  10. Alternate proposed architecture System-specific protocol. Aggregator must deal with all. What if not GBT? This green box is the COB Need system-specific error correction here For dynamic routing, aggregator needs to tell switch how to route data.

  11. Summary • We propose using the RCE/COB as the basic readout element for the nSW • The hardware already exists, satisfies the known requirements, and is already planned for the CSC in 2014. • The system is very flexible and scalable allowing a choice of many different architectures. It can easily adapt to changes in input/output protocols.

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