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ROD R&D Status

Recent work on the integration of subROD-Injector and subROD at 6.25 Gbps. PRBS tests and eye patterns show successful performance. Exploration of pre-emphasis and equalization. Comparison of Emcore and Reflex Photonics parts.

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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. Recent Work AZ-BNL joined for a second round of subROD-injector to subROD integration tests @ BNL Tektronix 20 GHz oscilloscope available for use Tested at data rates from 2.4 - 6.25 Gbps by running faster than the transceiver specs Performed 2^7 PRBS tests between subROD-injector and subROD Measured electrical signals at the transmitter and receiver Compared Reflex Photonics versus Emcore optics Based on 2^7 PRBS tests, the integrated system works at 6.25 Gbps!

  3. Integration Tests

  4. Integration Tests

  5. Recent PRBS Results 2^7 PRBS tests With Emcore receiver (and Emcore transmitter) No PRBS errors at 3.2, 4.0, 4.8, 5.0, 6.25 Gbps! Needed to use equalizer on Xilinx FPGA for 6.25 Gbps With Reflex Photonics receiver (and Emcore transmitter) No errors at 3.2, 4.0 Gbps Consistent with eye diagrams

  6. Recent Results Eye testing at transmitter @ 4.8 Gbps

  7. Recent Results Eye pattern at transmitter at 4.8 (top) and 6.25 (bottom) Gbps

  8. Recent Results Eye pattern at receiver FPGA at 4.8 (top) and 6.25 (bottom) Gbps

  9. Recent Results Eye pattern at receiver FPGA with Emcore (top) and Reflex Photonics (bottom) at 3.2 Gbps

  10. Recent Results Eye pattern at receiver FPGA with Emcore (top) and Reflex Photonics (bottom) at 4.8 Gbps

  11. Data Flow To ROD Each ROD corresponds to FEB half crate (0.2 x 1.4) and each ROD will contain 4 AMC cards 14 FEB’s / half crate => 4 FEB’s / AMC card 4 FEB’s = 4 x 40 MHz x 192 x 16 = 490 Gbps Each AMC card can accommodate 4 OE running at 490 Gbps / 4 / 12 = 10.2 Gbps each We are at 6.25 Gbps now so 10.2 Gbps is not a big stretch except for the radiation damage issue

  12. Data Flow Away from ROD Each ROD corresponds to 28 0.1x0.1 towers and each AMC card will compute these 28 tower sums L1 data 40 MHz x 28 x 2 x 16 = 38 Gbps This corresponds to 8 links running 38/8 = 4.75 Gbps which can be sent on 8 user defined output ports These run to transition modules which send the 28 tower sums to L1 L2 data (energy and time results) 80 kHz x 192 x 4 x 16 x 2 = 2.0 Gbps which might be handled by 2 gigabit Ethernet ports

  13. Work Plan Design and build subROD in AMC format Design and build subROD-injector in AMC format Optics implemented using Reflex Photonics LightABLE OE 2x12 channels @ 6.25 Gbps Shift design effort to the back end of AMC card for L1 and L2 data Ramp up simulation effort to verify (or not) FIR E, t calculations

  14. Conclusions Successfully integrated subROD-injector and subROD @ 6.25 Gbps Certified with 2^7 PRBS at present Eye patterns are in qualitative agreement with PRBS results Began exploration of pre-emphasis and equalization “knobs” on FPGAs Compared Emcore and Reflex Photonics parts beyond spec

  15. Integration Tests

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