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M. Kreider, T. Fleck WhiteRabbit 1 WhiteRabbit Timing System
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M. Kreider, T. Fleck WhiteRabbit 2 WhiteRabbit is designed to do... Time Synchronisation Timestamping Deterministic Switching Machine Control Goals
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M. Kreider, T. Fleck WhiteRabbit 3 WhiteRabbit offers... Timing Accuracy: < 1ns, low ps jitter Robustness: event loss < 10 -12 Scalability: 2000 timing receivers Link length: up to 10 km Features
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M. Kreider, T. Fleck WhiteRabbit 4 WhiteRabbit employs... SyncE– Synchronous Ethernet PTP – Precision Timing Protocol QoS– Quality of Service FEC – Forward Error Correction Technology
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M. Kreider, T. Fleck WhiteRabbit 5 SyncE: One clock is enough Nodes adjust to same physical clock Clock encoded in Ethernet carrier Clock recovered by PLL SyncE – Synchronous Ethernet
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M. Kreider, T. Fleck WhiteRabbit 6 SyncE – Synchronous Ethernet System Timing Master multi-layered WR Switches WR Nodes GPS The way of the Rabbit: WR Clock propagation
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M. Kreider, T. Fleck WhiteRabbit 7 PTP – Precision Time Protocol Precise phase measurement – Aiming for accuracy Undersample Clocks Feed resulting alias frequencies to PLL Determine phase difference
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M. Kreider, T. Fleck WhiteRabbit 8 PTP – Precision Time Protocol
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M. Kreider, T. Fleck WhiteRabbit 9 PTP – Precision Time Protocol PTP – Time Sync at a handshake Exchange messages between nodes Timestamp Msg arrivals and departures Calculate link delay and time difference Share results, adjust client clock
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M. Kreider, T. Fleck WhiteRabbit 10 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 11 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 12 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 13 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 14 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 15 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 16 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 17 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 18 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 19 PTP – A Simplified Example
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M. Kreider, T. Fleck WhiteRabbit 20 QoS – Not all packets were created equal Ethernet traffic split into: High Priority (HP) packets Standard Priority (SP) packets HP packets can preempt other packets „on-the-fly” QoS - Preemption & Determinism
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M. Kreider, T. Fleck WhiteRabbit 21 Port 1 Port 2 Port 3 WR Switch SP Packet HP Packet SP…HP PacketPacket QoS - Preemption & Determinism QoS – Allowing to cut the line
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M. Kreider, T. Fleck WhiteRabbit 22 Timing Data Master – Telling everyone what to do Generate Event Sequences Control Accelerator Production Chains Real Time Parallel Scheduling in FPGA Granularity Window for Load Balancing FAIR Timing Master
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M. Kreider, T. Fleck WhiteRabbit 23 TODO: WR Switch Slide WhiteRabbit Hardware
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M. Kreider, T. Fleck WhiteRabbit 24 SPEC - Simple PCIe FPGA-Mezzanine-Card Carrier Board WhiteRabbit Hardware
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M. Kreider, T. Fleck WhiteRabbit 25 Where WhiteRabbit is now: High precision Time Sync functionality since 2009 Switch, master and receiver specs in progress WR switch prototype since 2010 WR protocol implementation under development Status
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M. Kreider, T. Fleck WhiteRabbit 26 Where WhiteRabbit will be: Timing receiver board prototype late 2011 WR capable ‚Simple PCIe FMC carrier‘ board early 2011 WR Switch board manufacture in 2011 FAIR Timing Data Master prototype in 2011 Perspective
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M. Kreider, T. Fleck WhiteRabbit 27 Thank you for your attention
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M. Kreider, T. Fleck WhiteRabbit 28 Time for your Questions ? ? ? ?
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