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A PCI Express Optical Link Based on Low-Cost Transceiver Qualified for Radiation Hardness Andrea Triossi, Diego Barrientos, Damiano Bortolato, Roberto.

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Presentation on theme: "A PCI Express Optical Link Based on Low-Cost Transceiver Qualified for Radiation Hardness Andrea Triossi, Diego Barrientos, Damiano Bortolato, Roberto."— Presentation transcript:

1 A PCI Express Optical Link Based on Low-Cost Transceiver Qualified for Radiation Hardness Andrea Triossi, Diego Barrientos, Damiano Bortolato, Roberto Isocrate, Gabriele Rampazzo, Sandro Ventura and Marco Bellato INFN – Padova and Legnaro September 18, TWEPP 2012, Oxford, UK

2 Outlines PCI Express LINCO Project Early Developments PCI Express LINCO Project Early Developments Backgrounds Block diagrams Jitter test Block diagrams Jitter test New LINCO Boards Transceiver comparison PCI Express compatibility Transceiver comparison PCI Express compatibility Radiation Tests

3 Backgrounds Gbps/direction transfer rate Scalability (up to 32 lanes) Link Training Differential signaling Embedded clock (8b/10b) De-emphasis Retransmission of failed packets Quality of service PCI address space Gbps/direction transfer rate Scalability (up to 32 lanes) Link Training Differential signaling Embedded clock (8b/10b) De-emphasis Retransmission of failed packets Quality of service PCI address space PCI Express Started in 2005 Investigate a new physical medium for the protocol --> optical fibre Manufacture copper to optical adapters Assert their effectiveness in a harsh environment Started in 2005 Investigate a new physical medium for the protocol --> optical fibre Manufacture copper to optical adapters Assert their effectiveness in a harsh environment LINCO Project

4 Early development PMC form factor PCI Ex / PCI bridgeSFP transceivers PCI to PCI Express optical adapter used in the VME crate of the DT sector collector (CMS) PCI / VME bridge

5 New development PCI Express (x1 lane) optical translator Half height – Half length DMA transfer (128 Byte payload) Max transfer rate 200 MB/s

6 New development Two clock domains: PCI Express spread spectrum 100 MHz plain clock x4 optical switch PCI Express Gen2 20 Gbps Upstream port x4 Downstream port x1 Downstream port x4 Downstream port x1

7 Mux/Demux PI2PCIE2412 PLX Switch PEX 8609 PciEx 4x Finger Mux/Demux PI2PCIE2412 SFP Transceiver CLK Fan-out PI6C20400S CLK Fan-out PI6C20400S 100 MHz Oscillator FPGA Spartan3AN EEPROM Power Manager POWR1014A MOSFET DC-DC PCI Ex REF CLK PERST# I2CI2C Differential SEL1 SEL0 MOSFET DC-DC

8 Eye diagram 5Gbps Total jitter 0.38 BER level of PC linked by 30 meters OF and 2 LINCOs (one non-transparent) 8.5Gbps Finisar transceiver optimized for 4x Fiber Channel Test Setup

9 Early radiation test Paul Scherrer Institut 63 MeV proton Maximum total fluence of 5∙10 11 p/cm 2 ~ 66Krad Avarage flux 0.8 ∙10 8 ~ 2.8 ∙10 8 p/cm 2 /s VME registers continuously written with random patterns, read back and compared Total absorbed current monitored Test Setup Recoverable Micro Latch-up: Transceiver after 1 Krad Universe II bridge after 3.5 Krad No SEU!

10 Transceiver radiation test Paul Scherrer Institut with 63 MeV proton Maximum total fluence of 5∙10 11 p/cm 2 ~ 66Krad Avarage flux 0.8 ∙10 8 ~ 2.8 ∙10 8 p/cm 2 /s Test Setup JDS Uniphase CT2-MS1LBTD32C2 Finisar FTLF8524P2WNL Infineon V23848-N305-C56 Intel TXN31115D2 LaserVCSEL 1310nmVCSEL 850nm Current modulation √√√ X Laser driver enabling √√ XX Tx1.25∙ ∙10 10 Random jitterNo effect Rx Single events (1.25∙10 11 mean fluence) Single events (2.75∙10 11 mean fluence)

11 Transceiver radiation test

12 JDS Uniphase CT2-MS1LBTD32C2 Finisar FTLF8524P2WNL Infineon V23848-N305-C56 Intel TXN31115D2 LaserVCSEL 1310nmVCSEL 850nm Current modulation √√√ X Laser driver enabling √√ XX Tx1.25∙ ∙10 10 Random jitterNo effect Rx Single events (1.25∙10 11 mean fluence) Single events (2.75∙10 11 mean fluence) Transceiver radiation test Paul Scherrer Institut with 63 MeV proton Maximum total fluence of 5∙10 11 p/cm 2 ~ 66Krad Avarage flux 0.8 ∙10 8 ~ 2.8 ∙10 8 p/cm 2 /s Test Setup

13 PCI Express compatibility Infineon transceiver is not suitable for PCI Express protocol transmission after a radiation dose of 3.2∙10 11 p/cm 2 t t Eye opening 1

14 Conclusion Three flavors Deployed in several experiments (CMS, AGATA, ICARUS…) Three flavors Deployed in several experiments (CMS, AGATA, ICARUS…) LINCO Boards Commercial transceivers Intel and Infineon transceivers got through CMS requirement Commercial transceivers Intel and Infineon transceivers got through CMS requirement Harsh Proton Environment

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