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ROD R&D Status

This update provides information on the development of optical links and the integration of ATCA Sub-ROD components. It includes details on the progress, measurements, and testing of different components.

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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 (LAPP) G. Blasetti, M. Citterio (INFN, Milano) D. Schamberger (SUNY, Stony Brook)

  2. Optical Link Notes • Currently we build with • Reflex Photonics SNAP12 • Emcore SNAP12 • Both specified @ 3.5 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 3.5 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

  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 • OSA 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, received development document and source code from DESY. Even though we use different processor, all the code is in C which helps software porting • One 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 transceiver from Reflex Photonics • Present plan is to do sub-ROD and sub-ROD injector integration tests in October using Emcore parts which can run over spec

  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

  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)

  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. ATCA/AMC Form Factor • Working plan is to build ROD (and ROS) cards on ATCA cards • ROD receive modules in AMC format • ROD injector transmit modules in AMC format • ATCA sub-ROD already exists (BNL) • ATCA sub-ROD injector now exists (AZ) • ATCA sub-ROD injector can also be used to hold sub-ROD injector AMC card

  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

  19. Optical Link Notes • Designing @ 6.25 Gbps and beyond • Hyperlynx SI software • Good for impedance estimation • Less useful eye patterns (2.5 - 6 GHz below)

  20. ATCA Sub-ROD Injector (AZ) • Eventual testing in ATCA crate

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