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ROD R&D Status

This status update discusses the progress of optical link development and the ATCA Sub-ROD project. It covers the current build, measurements, design improvements, and future testing plans.

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ROD R&D Status

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  1. ROD R&D Status K. Johns, C. Armijo, J. Steinberg (U. Arizona) H. Chen, F. Lanni, J. Mead (BNL) L. Hervas (CERN) A. Meyer, A. Kielburg-Jeka, A. Straessner (Dresden) G. Perrot, A. Bazan, F. Bellachia, I. Wingerter-Seez (LAPP) M. Citterio (INFN, Milano) D. Schamberger (SUNY, Stony Brook)

  2. Optical Link Notes • Currently we build with • Reflex Photonics SNAP12 • Emcore SNAP12 • Both specified @ 3.3 Gbps • Recent news/results • Delivery date for Reflex Photonics SNAP12 @ 6.25 Gbps still +6 weeks • First promised for July 1 • Both RP and Emcore 3.3 Gbps versions can run at higher speeds • Emcore shows better performance (up to 5 Gbps) based on measured BER

  3. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Measurements with AZ test board 8 inches 2x8 inches and via 3.2 inches 8 inches

  4. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Vias degrade eye pattern • No difference in trace length or layer

  5. Optical Link Notes • In order to move to higher optical density we are now designing with Reflex Photonics LightABLE OE • OE is an IC with 12 channel GaAs VCSEL or 12 channel GaAs PIN photodetector • Connected electrically via wire bonds • Connected optically via MT connector • Present speed @ 6.25 Gbps • Designer provides an electrical footprint on the PCB • RP mounts (wirebonds) the OSA • OE part and mounting cost is ~$350 / die

  6. Optical Link Notes

  7. ATCA Sub-ROD Development (BNL)

  8. ATCA Sub-ROD Development • AdvancedTCA 8U Module • With separated +5V power connector and Gigabit Ethernet connector on front panel, it allows testing of main functions without ATCA crate • IPMI development is underway, using development document and source code from DESY. Even though we use different processor, all the code is in C which helps software porting • One sub-ROD module was shipped to Dresden in late June/early July • High Speed Parallel Optical Links and FPGA SERDES • Self loopback test works at 3.2Gbps on 12 channels, 40Gbps total bandwidth • Sub-ROD (and sub-ROD injector) still awaiting 75 Gbps transceivers from Reflex Photonics • Present plan is to do another round of sub-ROD and sub-ROD injector integration tests in October using Emcore parts which can run over spec (~5 Gbps)

  9. ATCA Sub-ROD Injector (AZ) • Sub-rod injector ATCA card also now available

  10. ATCA Sub-ROD Injector (AZ) • Testing with test ATCA backplane

  11. ATCA Sub-ROD Injector (AZ) • Details of test backplane

  12. ATCA Sub-ROD Injector (AZ) • Eventual testing in ATCA crate • We received this demo model from ASIS

  13. ROD in ATCA/AMC Form Factor • Present plan is to build processing units (ROD or ROD injectors) in AMC format on ATCA cards • ROBs would also reside in ATCA crate

  14. ROD in ATCA/AMC Form Factor • AMC cards are Processing Units • Contain optical receivers and FPGA based SERDES • Perform energy calculations and partial Level-1 sums • High speed, low latency connections for Level-1 sums require communication between AMC modules and possibly between different ATCA carriers • Processing units can be developed independently of ATCA carrier board (using MicroTCA crate) • ATCA Carrier Board • Provides connections between AMC modules and also to ATCA backplane • Low latency switching protocol • Possible connection to ROB via 10G Ethernet • Provides connections to rear transition board for Level-1 sums

  15. AMC Card using LOB • 4 x 12 channels per AMC card • Stratix IV has 48 transceiver channels @ 8.5 Gbps • 4 AMC cards per ATCA (ROD) DDR3 PCI Express Driver Microcontroller Flash Ethernet EPROM

  16. AMC Card using LOB • 4 x 12 channels per AMC card • Stratix IV has 48 transceiver channels @ 8.5 Gbps • 4 AMC cards per ATCA (ROD)

  17. AMC Sub-ROD • Two ATCA boards per half barrel FEC • 2 SNAP12 connectors / AMC card x 1 FEB/SNAP12 x 4 AMC cards = 8 FEBs • Assumes 10 Gbps transmission • One ATCA board per half barrel FEC • 4 optical connectors / AMC card x 1 FEB / SNAP12 x 4 AMC cards = 16 FEBs • This eliminates data transmission between different ATCA boards eases processing of the Level-1 trigger sum • The MTP connectors utilize the same MT ferrules and package them in a push-pull keyed connector housing for quick and easy connection • The width of MTP connector is ~15mm, which is more than twice of the width of MT connector • Molex high density optical MT connectors • Circular MT: single MT ferrule, 12 to 72 fibers per ferrule • 1x6 Array: 6 MT ferrules, 12 fibers per ferrule • Both Molex and Tyco offer high density optical MT cable assemblies using 72-fiber MT ferrule in the industry standard MTP connector MTP Connector MT Connector Disassembly of MTP Connector

  18. sLHC LAr ROD Upgrade R&D • Mailing list • slhc-atlas-lar-rod@cern.ch • CERN espace • https://espace.cern.ch/slhc-atlas-lar-rod • Phone meeting • First meeting was organized on Sept. 11th; people from Univ. of Arizona, BNL, Dresden, LAPP and Stony Brook Univ. were connected • Goal was to update what everybody’s been working on and discuss how to proceed • Plan to continue this phone meeting once a month

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