SpaceWire Backplane

SpaceWire Backplane
SpaceWire Backplane
ESTEC Contract No 4000104085
Presented: Jørgen Ilstad, TEC-EDP
24/04/2012
ESA UNCLASSIFIED – For Official Use
Key objectives
1. Trade off different backplane architectures and technologies to
produce a SpaceWire backplane specification for ECSS
standardisation.
2. The SpW-Backplane specification shall
a.
use a standard backplane connector with clear path to
a space qualified version
b.
define a variable/expandable number of slot/boards
for the backplane.
c.
define a number SpaceWire interconnections and high
speed serial links to co-exist on the backplane.
d.
specify fault tolerant power distribution
e.
use an appropriate number of SpW links, HSSL and
discrete I/O per module
f.
host general I/Os
g.
ensure good signal integrity for high speed signals up to
2.5Gbit/s and beyond.
SpW Backplane | 24/04/2012 | Slide 2
ESA UNCLASSIFIED – For Official Use
The need for a SpWBP specification
User needs for a SpW backplane specification:
1. Reduce NRE development costs for avionics systems.
2. Satisfy use of both SpaceWire and next generation HSSL.
3. Highly reliable and scalable architecture.
4. Standardised way of implementation
5. Interoperability between equipment vendors?
Meeting these needs may be achieved by:
1. Prototyping and agree on a common denominator for the SpaceWire
backplane.
2. Fund activities to aid prototyping and development of
standardisation proposals.
3. Formalise a SpW Backplane standard within the ECSS framework.
SpW Backplane | 24/04/2012 | Slide 3
ESA UNCLASSIFIED – For Official Use
ECSS SpW Backplane draft specification
review process
1. First draft of specification to be reviewed by members of the SpW WG
2. Time frame is foreseen between two WG meetings
3. Inputs from SpW WG should raise the maturity level
4. Goal is to define a draft specification which shall be used as baseline for a
ECSS standard.
ECSS Standardisation Process
SpW Backplane activity
SpaceWire
WG
SEA
SpW Backplane | 24/04/2012 | Slide 4
ESA UNCLASSIFIED – For Official Use
Outside the scope of this activity
ECSS
Secretariat
ESA
ECSS
Working
Group
ECSS SpW Backplane draft specification
contents
Clauses suggested to be included
a.
Connectors and signal
configuration
–
SpW pins, user pins,
reserved pins etc.
b.
Module and backplane physical
dimensions (form factor).
c.
Power distribution
d.
Routing topology
–
Should not impose a
strict passive or active
backplane.
e.
Design rules in line with other
ECSS quality assurance standards.
f.
Test criteria
–
Mechanical and electrical
SpW Backplane | 24/04/2012 | Slide 5
ESA UNCLASSIFIED – For Official Use
Adopt Concepts from Existing
Terrestrial Standards?
“Newer” standards
1. PICMG AdvancedTCA 3.0 R3.0
a.
The PICMG 3.0 “core” specification will specify board, backplane and
shelf mechanicals, power distribution and the connectivity required for
system management.
2. PICMG AdvancedTCA 3.4 PCI Express
a.
Define how PCI Express and PCI Express Advanced Switching transport
is mapped onto PICMG 3.0
3. PICMG AdvancedTCA 3.5 RapidIO
a.
Define how Serial RapidIO transport is mapped onto PICMG 3.0
4. PICMG EXP.0 R1.0
a.
Define the connector, electrical, and mechanical requirements of 3U/6U
System Boards, Peripheral Boards, Switch Boards, and Backplanes
using PCI Express as peripheral interconnect with CompactPCI
interoperability features.
SpW Backplane | 24/04/2012 | Slide 6
ESA UNCLASSIFIED – For Official Use
Adopt Concepts from Existing
Terrestrial Standards?
“Newer” OPEN standards
1. ANSI VITA 46.0 (VPX) and 46.3 PCIexpress over VPX
a.
PCIe on VPX Fabric connector
2. ANSI VITA 65 – OpenVPX (VITA)
a.
Approved in June 2010
b.
Adapted for military/aerospace that needed ruggedized
systems
c.
Specifies a minimum set of backplane configurations – also
suitable redundant architectures.
d.
Gives clear information about data rate, routing topology and
fabric topology that has to be used on the backplane.
e.
Contains a number of sub specifications for ruggedized
solutions.
SpW Backplane | 24/04/2012 | Slide 7
ESA UNCLASSIFIED – For Official Use
Which backplane connector?
Impedance matched connector or not?
For SpW links from 200 Mbps upto 400Mbps
- Impedance matched connector may not be
necessary.
- SpaceQ cPCI connector looks promising (to be
tested) to fullfill SpW needs. (Hypertronics K2A)
- Need careful diff. signal to ground pin
arrangement to avoid crosstalk and signal
distortions.
1.25Gbits w. NEXT
SpW Backplane | 24/04/2012 | Slide 8
ESA UNCLASSIFIED – For Official Use
Which backplane connector?
Impedance matched connector or not?
For SpFi links from 2.7Gbps and beyond:
- Impedance matched connector is needed
- No good Space Q alternative yet.
- Some promising candidates are emerging
- E.g. Hypertronics KVPX, Tyco HSR
- Little information is available
- ITAR restrictions are a concern
SpW Backplane | 24/04/2012 | Slide 9
ESA UNCLASSIFIED – For Official Use
Other requirements for the connector
Impedance matched and high density,- but
a.
Must show no pin fretting when subjected vibration
b.
No corrosion during long term exposure
c.
Support number of mate and de-mate cycles.
d.
Acceptable insertion force levels.
e.
Space approved materials
SpW Backplane | 24/04/2012 | Slide 10
ESA UNCLASSIFIED – For Official Use
Thank you!
SpW Backplane | 24/04/2012 | Slide 11
ESA UNCLASSIFIED – For Official Use
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