esa-suess spacefibre introductionspacewire.esa.int/wg/spacewire/spw-snp-wg-mtg8-proceedings... ·...

Martin Suess Slide : 1

SpaceFibre

SpaceWire WG Meeting #817 to 19.01.2007, ESTEC

SpaceFibre - Introduction

Martin Suess - European Space Agency

TEC-EDPESTEC


SpaceFibre


Overview

• SpaceFibre requirements

• Demonstrator developments

• ESA roadmap for SpaceFibre developments

• Next Steps to be done in SpaceWire WG


SpaceFibre


SpaceFibre Requirements

• Provide symmetrical, bi-directional, point to point link connection• Handle data rates 1-10Gb/s and support variable signalling rates• Bridge distances up to 100m at maximum data rate• Be based on fibre optic link technology which provides galvanic isolation• Copper version with AC coupling for shorter distances• Allow for mixed SpaceWire – SpaceFibre networks via special SpaceWire-

SpaceFibre Routers• Transmit a scalable number of virtual SpaceWire links over one SpaceFibre • Compliant to the protocols and routing mechanisms defined in the SpaceWire

standard• Similar bit error rates as specified for SpaceWire• Fast start up and fine grained power management• Intrinsic support to quality of service


SpaceFibre


Mixed SpaceWire – SpaceFibre Router & Networks• Transfer speed in network is determined by slowest link on the path• SpaceFibre must not be slowed down by SpaceWire Link in network• Concept: Several virtual SpaceWire Links over one SpaceFibre

– Multiplexing of data streams is required– This can be performed on character or frame level– Frame level multiplexing is preferred for a higher level of flexibility

SpaceWire - SpaceFibre Router BSpaceWire - SpaceFibre Router A

SpaceFibrePort 1

Deserializer

SpWPort 1

SpWPort 2

SpWPort 3

SpWPort 4

Non-blockingCrossbarSwitch

8B10

B E

ncod

er8B

10B

Dec

oder

Serializer

SpaceFibrePort 2

SpaceFibrePort 1

Deserializer

SpWPort 1

SpWPort 2

SpWPort 3

SpWPort 4

Non-blockingCrossbarSwitch

8B10B

Encoder8B

10B D

ecoder

Serializer

SpaceFibrePort 2

Cod

ing

& L

ink

Con

trol

Coding &

Link Control

Config.Port

/

/Parallel

Port

Config.Port

//ParallelPort


SpaceFibre


SpaceFibre Prototyping Activities

• Prototyping has been performed by two teams• Covering complementary areas:

– SpaceFibre physical layer optical– SpaceFibre Codec

• Two parallel development contracts

– “Optical Links for the Space Wire Intra Satellite Network Standard“Objective: The development of a high speed point to point fibre

optic link for space applications.Contractors: Patria (Prime), VTT, INO, Fibre Pulse, W.L. Gore

– “Space Fibre” The TOPNET Call Off No. 2Objective: Codec development and SpaceFibre integration into the

Space Wire network through the development of a high speed router.

Contractor: University of Dundee


SpaceFibre


SpaceFibre Optical Link Overview

Driver Emitter

Emitter Driver

Fibre Cable and Connectors

Fibre Cable and Connectors

TIA

TIA

Detector

Detector Limiting Amplifier

Limiting Amplifier

Ser

ial D

igita

l Dat

a -C

LM

Ser

ial D

igita

l Dat

a -C

LM

Optoelectronic Module Optoelectronic Module

• Development, bread boarding of electro-optical technology as physical layer for SpaceFibre

• Includes first environmental testing• NEXT STEP: Development of Engineering Model (EM) of a high

speed fibre-optic transceiver to be used for pre-qualification


SpaceFibre


SpaceFibre Optical Transceiver ModuleMechanical properties:• Dimensions of 8 ⋅ 22 ⋅ 25 mm3

(thickness ⋅ length ⋅ width). • Mass without pigtails: 5 g Electrical properties:• Power dissipation < 500mW• Excellent electrical performance• BER < 1.3 · 10-14 @ 2.5 Gbps

SpaceFibre transceiver module with Diamond AVIM connectors

Eye diagram of the 3.125 Gbps PRBS at the receiver output


SpaceFibre


SpaceFibreCODECBlock

Diagram

LinkControlState

Machine8B/10B Decoder

Rx CodeSynchronisation

8B/10B Encoder

Serialisation/DeserialisationSerialisation/

Deserialisation DeserialiserSerialiser

PhysicalMedium

Dependent

PhysicalMedium

Dependent

Coding& LinkControl

TXD<31:0>TX_ORD_SET

TX_ENSYS_CLK

tx_code<9:0> rx_code<9:0>

tx_bit rx_bit

RXD<31:0>RX_ORD_SETRX_DVRX_ERSYS_CLKSTATE

Transmit ReceiveMedium Dependent Interface

RX Elastic Buffer

Driver Receiver

RXCLK

RX_CLKSYS_CLK

Port Interface

Idle Frame Insertion De-Scrambler

Idle Frame Removal

Scrambler


SpaceFibre


SpaceWire-SpaceFibre Router Implementation

• Specific board based on Xilinx Virtex 4 has been designed• Makes use of Rocket-IO interface and dedicated SerDes chips• Supports SpaceFibre Optical Link interface and SpaceFibre copper

version via SMA connector• Copper version will only bridge a limited distance due to cable losses

Xilinx Virtex 4

SpaceWire x 4

Expansion I/O

SMA

FOT

SMA

FOT

SerDes

SerDes

LVDS

3.3V LVCOMS

RocketIO

ClockSynthesisers

FixedClocks

FOT = Fibre Optical Transceiver

Block Diagram of SpaceWire-SpaceFibre Router with optical and electrical interfaces


SpaceFibre


SpaceFibre Demonstrator

• University of Dundee:– SpaceWire-SpaceFibre Routers– CODEC– Serialiser / Deserialiser– Copper Version

Optical Fibres

PC withSpaceWireInterfaces

SerialElectricalInterface

CML

SerialElectricalInterface

CMLSpaceWireSpaceFibre

Router

SpaceWireSpaceFibre

Router

PC withSpaceWireInterfaces

Fibre OpticalTransceiver

Fibre OpticalTransceiver

CodecSerialiser/

Deserialiser

CodecSerialiser/

Deserialiser

• Patria et.al.:– Fibre Optical Transceiver– Optical Fibres– Optical Cable Assembly– Fibre Connectors– Environmental test program

• Integration of both developments into one demonstrator


SpaceFibre


ESA Roadmap for SpaceFibre Development

– SpaceFibre Roadmap As proposed and harmonised with the OPDP Dossier • SpaceFibre Fibre-optic Data Link

– Engineering Model of Electro-optical converter• SpaceFibre Very High Speed Link Technology Demonstrator

– Early feasibility demonstration of possible flight implementation based on existing qualified components

• European SerDes IP-core and Component– Key component with improved performance compared existing devices

• SpaceFibre Codec IP-core and Network Terminal Chip• SpaceWire - SpaceFibre Network Bridge• SpaceFibre Router

– Basic component required to implement SpaceWire – SpaceFibre network

Task Nam e

SpaceFibreSpaceFibre Fibre-optic Data LinkSpaceFibre Very High Speed Link Technology Dem onstratorEuropean SerDes IP-core and ComponentSpaceFibre Codec IP-core and Network Terminal BhipSpaceWire - SpaceFibre Network BridgeSpaceFibre Router

Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q12007 2008 2009 2010


SpaceFibre


Next Steps for SpaceWire WG

• Review within SpW WG proposals for:– CODEC design– Physical layer – optical

• Establish baseline for physical layer – electrical• Perform breadboarding activities for proposal

consolidation• Drafting of standard documents

• Coordination meeting and discussion this Friday PM in room Bc047

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