LKr Readout with CARE modules
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LKr Readout with CARE modules. CARE Features. Each CARE consists of 4 sectors → total 896 “virtual modules” in LKr. The analog LKr signals are digitized with 40 MHz. Raw data input is 8x120=960 MB/s per LKr sector (16 chans).

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LKr Readout with CARE modules

NA62 TDAQ WG Meeting, Anacapri, 2 Sep 2009


Care features
CARE Features

  • Each CARE consists of 4 sectors→ total 896 “virtual modules” in LKr.

  • The analog LKr signals are digitized with 40 MHz.

  • Raw data input is 8x120=960 MB/s per LKr sector (16 chans).

  • Each LKr sector (8x CPDAS = 16 chans) has two DDR2 SODIMM socketswith maximum 2 x 4 = 8 GB (intermediate) data storage.

  • This corresponds to ~8.3 s of continuous data-taking @ 40MHz.

  • Read-out is with 1 GbE link/sector = ~80 MB/s using jumbo frames(4 GbE links per CARE), which represents approx. 1 MHz event rate maximum (compared to 10 KHz for the CPD) if readout is sustained between spills.

  • The same physical format as the CPD in order to re-use the CPDTR trigger sum board, the 7000 CPDAS cards and the FASTBUS crates for power and cooling

  • CARE has no FASTBUS interface.

  • 80 MHz Clock as CPD, with SoB (Start of Burst) and EoB (End of Burst)and other functionalities (to be defined) by addition of a TTCrx device.

  • CAN-bus for the DCS (Detector Control System)which interfaces to an ELMB module on the CAREfor configuration & monitoring of the CARE module.

NA62 TDAQ WG Meeting, Anacapri, 2 Sep 2009


Lkr readout with care 1
LKr Readout with CARE (1)

  • First attempt at defining an architecture

  • 224 CAREs = 896 LKr 16-chan sectors, continuous (untriggered) data-taking (960 MB/s per sector) in burst

  • Start-of-burst signal absolutely necessary to sync all CARE modules

  • A (bidirectional) GbE connection/sector (max 80 MB/s)..

  • ..connecting via GbE switches..

  • ..to processor nodes that doevent building and processing(e.g. zero-suppression) andforward the events to NA62 DAQ

    In addition:

  • Analog trigger sums go tothe LKr L0 trigger sysstemusing the existing cabling

  • Several CAN buses (e.g. 8,i.e. 28 CAREs/bus) forconfiguration & monitoring

NA62 TDAQ WG Meeting, Anacapri, 2 Sep 2009


Lkr readout with care 2
LKr Readout with CARE (2)

Readout Controller

  • central role in LKr readoutsteered by inputs from Lx trigger(s)

  • issues broadcasts to CAREs, containing 40+ event requestsand the address of a singledestination eventbuilder/processor node port

    • event request = timestampof the event from the start-of-burst

    • each processor node hasmultiple GbE ports (e.g. 4)

  • each CARE assembles and sends the data of the 40+ events in one (jumbo) frame (ca. 9000 bytes) to the destination node port (jumbo in order to optimize use of GbE bandwidth)

  • note: Ethernet between RC+CARE+ switches+nodes and TCP/IP between nodes+TDAQ

NA62 TDAQ WG Meeting, Anacapri, 2 Sep 2009


Lkr readout with care 3
LKr Readout with CARE (3)

GbE Switches

  • CARE sector GbE output @ 80MB/s→ (80M/9000)*47 = ca. 400 kHz evtrate

  • event building: 896 jumbo frames(47 evts, ca. 8 MB) go to one output port(or to 4 ports of one node in parallel?)

  • at 80MB/s (max GbE) this takes 100 msnot incl. latency

  • one port then is able to consume470 evts/s

  • so to sustain 400 kHz event rateneed 400k/470 = ca. 850 GbE ports= ca. 200 processor nodes ifthere are 4 ports/node

NA62 TDAQ WG Meeting, Anacapri, 2 Sep 2009


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