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RPC Electronics: Technical Trigger

RPC Electronics: Technical Trigger. Outline: RPC-based Technical Trigger Principles of operation Implementation MTCC readiness. Flavio Loddo I.N.F.N. Bari On behalf of the RPC-Trigger group. RPC Technical Trigger.

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RPC Electronics: Technical Trigger

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  1. RPC Electronics: Technical Trigger • Outline: • RPC-based Technical Trigger • Principles of operation • Implementation • MTCC readiness Flavio Loddo I.N.F.N. Bari On behalf of the RPC-Trigger group Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  2. RPC Technical Trigger Goal of this project is to produce an RPC-based cosmic ray trigger for the Commissioning of RPCs, the Cosmic Challenge and later running of CMS as Technical Trigger The project started recently, when electronics and cabling in the cavern were defined and frozen ↓ Use existing infrastructure (as much as possible) and don’t introduce major modifications to the existing electronics (Link Boards) Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  3. Block Diagram of RPC Electronics full chain Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  4. RPC Technical Trigger PhaseI: Sector Trigger for testing RPC (and DT) during Commissioning and MTCC RBC (RPC Balcony Collector) RPC Cosmic trigger Phase II: Technical trigger to be used during off-beam periods for detector calibration RBC + TTU (Technical Trigger Unit) Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  5. LBBox LBBox LBBox LBBox LBBox LBBox RBC RBC RBC RBC RBC RBC LBBox LBBox LBBox LBBox LBBox LBBox Receiving panel RPC Technical Trigger UXC area USC area Readout Crate 1 RBC/ 2 sectors Fiber Technical Trigger Unit TTU TTU Barrel Wheel TTU TTU RBC (RPC Balcony Collector) TTU 6 Fibers/wheel 30 Optical Fibers Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  6. RBC Implementation • The RPC signal cables (LVDS) are connected to the Link Boards (LB) for synchronization, data compression and optical conversion • Each LB reads 96 strips (1 bi-gap = half/chamber) and can produce 1 OR to be used for our goal • Each LBBox (LBB) houses 13 or 15 (sect. 4 and 10) LBs of 1 Barrel Sector • The LBBs are distributed in the 30 periphery racks in groups of 2: • one odd sector and one even sector • We can house 1 RBC/rack  1RBC/2 sect  30 RBCs in total Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  7. RPC LBBox • LBB's slots 11, 12, 13 are always free in barrel • CSC connector is not used in barrel • at least one I2C output is not used on backplane RBC will be located on slot 12 of LBB of all odd sectors RBC_fake will be located on slot 12 of LBB of all even sectors Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  8. Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  9. RBC Main Features • Receive 2x13 (or 15) ORs from LB (LVDS) • (OR of 96 strips (1 bi-gap = half RPC)) • Mask noisy/dead Ors • Produce Sector Trigger (LVDS), with selectable Majority level • Force selected ORs to be in the coincidence, to • increase trigger selectivity • Introduce latency for synchronization • I2C Interface • Transmit input OR optically to Counting Room (GOL) Generic Barrel Sector RB4 RB3 RB2_OUT RB2_IN RB1_OUT RB1_IN Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  10. RBC PCB Layout Optical transceiver • 10 Layers PCB14x14 cm2 • (small board to save money) • to be housed on Mother Board, fitting LBBox dimensions GOL Z-Pack Conn. JTAG Conn. FPGA Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  11. RBC Motherboard Layout Front side • Backplane connector: • 3.3 V • 2.5 V • GND • I2C Low profile connector (5 mm) to connect RBC to Motheboard Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  12. Quantities • 30 RBC (10 layers PCBs 14x14 cm2) • 30 RBC Mother Boards (2 layers PCBs 16x46 cm2) • 30 RBC_FAKE (4 layers PCBs 2x4 cm2) • 60 RBC_FP1 (4 layers PCBs 18x14 cm2) • 60 RBC_FP2 (4 layers PCBs 18x14 cm2) Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  13. W+2: Sect. 10 Sect. 11 Sect.10-11 patterns Trig_+2 OR Trig_+1 W+1: Sect. 10 RPC Technical Trigger for MTCC Two RBC (RPC Balcony Collector) can be used during the MTCC to provide two Cosmic Triggers to the LTC (or PSB), based on the coincidence of half chamber ORs coming from the LBs Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  14. 150 m (shielded twisted cable) RBC LTCOr PSB LVDS-LVPECL Transceiv. LVPECL Receiv. LVDS Driver RBC testing for MTCC • Because of long distance (150 m) between Detector and “Green Barrack” during MTCC, we could send the Technical Trigger in LVPECL, that is more robust than LVDS and introduce optocouplers to cut ground loops • This configuration was succesfully tested in Bld. 904 with both LTC and PSB • Preliminary latency estimate:  45 bx Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  15. LBBox LBBox LBBox LBBox LBBox LBBox RBC RBC RBC RBC RBC RBC LBBox LBBox LBBox LBBox LBBox LBBox Receiving panel RPC Technical Trigger Implementation UXC area USC area Fiber Technical Trigger Unit TTU To Global Trigger TTU Barrel Wheel TTU TTU RBC (RPC Balcony Collector) TTU 6 Fibers/wheel 30 Optical Fibers Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  16. 6x16 bit data 6x16 bit data TTU (Technical Trigger Unit) Block Diagram • Receive optical link from RBCs • Combine ORs from 1 Wheel and produce Wheel Cosmic Trigger • To be housed in the counting room Programmable Majority Unit or Pattern Recognition Processor TLK2501 Wheel Trigger TLK2501 TLK2501 TLK2501 TLK2501 HFBR-5720 6 Fibers Deskewed HF clock VME Interface QPLL TTCrx Comm. line LHC Clock Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  17. RPC Trigger Board as TTU These functions are performed by the RPC Trigger Board: • TTU needs: • 30 signals from detector: 1.6 GHz GOL drive multimode fiber; • each fiber transfers 26 or 28 bits @ 40 MHz; • Signals must be synchronized; • Pattern logic to make cosmic trigger • RPC Trigger Board offers: • 18 inputs: 1.6 GHz GOL driven multimode fiber; • Opto synch FPGA for every 3 optical inputs; • Transmission to PAC mezzanine boards (VHDL code) • VHDL code for Internal Interace (for VME driven internal bus and software tools) Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  18. RPC Trigger Board as TTU • 3 TBs can be used to cover the whole Barrel, using 12 links per TB • The Stratix2 PAC mezzanine board gives very big space for algorithm (1 or 2 should be enough) • TTU custom backplane (for TTCrx and to send out the Trigger) but be designed, but can be derived from the design of TB backplane Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

  19. Conclusions • The RPC Technical Trigger project is under progress: • 3 RPC Balcony Collector (RBC) prototypes are available for MTCC • The full production is expected to be available before the end of 2006 • The design of the new firmware for the Trigger Board-TTU will start in few weeks Annual Review Cern -June 13th, 2006 F. Loddo I.N.F.N. Bari

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