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/trunk/doc/ReadMe.txt
1,42 → 1,61
 
///////////////////////////////////////////////////////////////
 
SpaceWire (SpW) for What?
"Spw grown organically from the needs of on-board processing applications.
(SpW is a network with Routers)
This Standard addresses the handling of payload data and control information on
board a spacecraft. It is a standard for a high speed data link, which is intended
to meet the needs of future, high capability, remote sensing instruments and
other space missions...
Processing units, mass-memory units and down-link telemetry systems devel-
oped for one mission can be readily used on another mission, reducing the cost of
development, improving reliability and most importantly increasing the amount
of scientific work that can be achieved within a limited budget.
(SpW is currently being installed on several NASA and European Space Agency (ESA)
spaceships to support onboard communications during space missions.---27 January 2003)
SpaceWire has taken into consideration two existing standards, IEEE 1355-1995
and ANSI/TIA/EIA-644.
"Point-to-point serial links with LVDS. The maximum data signalling rate that can be
achieved is different from one system to another, depending on several factors such as:
1)cable length, 2)driver-receiver technology, and 3)encoder-decoder design, and is limited by 4)skew and jitter."
"Spw grown organically from the needs of on-board
processing applications.
 
SpW is a network with Routers.
 
This Standard addresses the handling of payload data and control
information on board a spacecraft. It is a standard for a high
speed data link, which is intended to meet the needs of future,
high capability, remote sensing instruments and other space missions.
 
Processing units, mass-memory units and down-link telemetry
systems developed for one mission can be readily used on another
mission, reducing the cost of development, improving reliability
and most importantly increasing the amount of scientific work that
can be achieved within a limited budget.
 
SpW is currently being installed on several NASA and European Space
Agency (ESA) spaceships to support onboard communications during
space missions.---27 January 2003)
 
SpaceWire has taken into consideration two existing standards,
IEEE 1355-1995 and ANSI/TIA/EIA-644.
 
Diff & Relation with IEE1355 device(eg. Atmel.Inc "TSS901E" which also called "SMCS332")
"The SMCS devices implement revision A of the standard, which is based on IEEE1355. They do not implement
the current version of SpaceWire. However, the current version of SpaceWire is backwards compatible with the earlier revision."
"Point-to-point serial links with LVDS. The maximum data signalling
rate that can be achieved is different from one system to another,
depending on several factors such as: 1)cable length, 2)driver-receiver
technology, and 3)encoder-decoder design, and is limited by 4)skew and
jitter."
 
//////////////////////////////////////////////////////////////////////////////////////
 
 
 
 
 
Diff & Relation with IEE1355 device(eg. Atmel.Inc "TSS901E" which
also called "SMCS332")
 
"The SMCS devices implement revision A of the standard, which is
based on IEEE1355. They do not implement the current version of
SpaceWire.
However, the current version of SpaceWire is backwards compatible with
the earlier revision."
 
/////////////////////////////////////////////////////////////////
 
 
 
 
 
This Core?
- CODEC
- A pure synchronous design(so it can works well in fpga) written in verilog, completely open.
- Annother high speed CODEC use PLL and clock recovery/lock circuit.
-SWR
- SWR
- ...Synchronously Clocked Crosspoint...(Switch Latency...)
- ... buffered crossbar...distributed scheduling(effective and simple). 16x16 now may be enough.
 
83,10 → 102,6
All routing function is performed by Routers.
 
 
 
 
 
 
-ROUTER
- bufferd switch
- ... minimum switching latency and lowest propagation delay ...
94,9 → 109,14
- ...operate directly on variable-size packets,...no packet
segmentation and no scheduler(distributed scheduling decisions)
- "sop_ack_o" is a sychrnous acknowledge signal indicate that the cell which a package want to be loaded has space to load. If it's true, after 1 clock, the controller will load data to that cell.
- Note if the buffer has data, the data emerges on the data output port currently is not valid. You need to read it (by a synchronous pulse) then the valid data occurs! The buffer is Revision 1.5 of "eth_fifo" which originally written by Igor Mohor(from SI).
 
 
 
*********************************************************
- Function limitations:
-
-
- +Conformity Limitations:
|-- Link Interfaces --+
| |-
117,7 → 137,7
 
 
Some interesting topics:
1)Open or close?
1) Open or close?
In the "SpaceWire Router Requirements Specification(Issue:1 Rev: 5 Date:28.02.2003)" clause 4.1 has some words about
this question:
"Open VHDL Core
125,10 → 145,11
Rationale: It will minimise design effort and help to validate the VHDL core."
It did not refer to open the Router's IP,besides i have not found free "IO ports" core available on internet.
 
2)Active things:(observe at 03-26-2005)
If someone has deep interest,you could pay attention to a conference "DASIA(DAta Systems In Aerospace) 2005" in
Sheraton Grand Hotel, Edinburgh, Scotland during 30th May and 2nd June 2005.
2) Georgia Institute of Technology introduced DX-Gt, a crossbar switch generator(generate Verilog code) for dynamic memory management in multiprocessor SoC in about 2003.
 
3) Active things:(observe at 03-26-2005)
If someone has deep interest,you could pay attention to a conference "DASIA(DAta Systems In Aerospace) 2005" in Sheraton Grand Hotel, Edinburgh, Scotland during 30th May and 2nd June 2005.
 
Tuesday 31st May 2005(SESSION 4B ON BOARD BUSES AND COMMUNICATION)
[Chairperson: P. Plancke, ESA/ESTEC, The Netherlands]
09:00 Quality from SpaceWire and Quality into SpaceWire Systems B.M. Cook, P.H. Walker - 4Links, UK
149,57 → 170,54
Industry info and some Web site could be accessed for a further reference::
 
1) "SpaceWire UK are specialist providers of VHDL Intellectual Property & Design Services for the Space Industry".
The SpaceWire UK has developed a CODEC and SpaceWire Switch Core (Router) in VHDL for business. (I am sure i
don't want to disturb this new ip vendor and I also had consulted their ip schemes.My try is just a hobby and
have a heart to contribute to promoting the SpW standard.)
www.spacewire.co.uk
The SpaceWire UK has developed a CODEC and SpaceWire Switch Core (Router) in VHDL for business. (I am sure i don't want to disturb this new ip vendor and I also had consulted their ip schemes.My try is just a hobby and want to contribute to promoting the SpW standard.)
http://www.spacewire.co.uk
 
2) The EADS Astrium GmbH (formed in May 2000 by the merger of Matra Marconi Space (France/UK) and the space division
of DaimlerChrysler Aerospace (Germany)) is well known as the author of the "Router requirements spec"
(Steve Parkes, University of Dundee).
2) DSI GmbH is a German company which offers "SLI-Core", a VHDL CODEC Core for the SpaceWire Link Interface in June, 2004. Their English WEBs is preparing(observed in April,2005).
http://www.dsi-it.de
 
3) The EADS Astrium GmbH (formed in May 2000 by the merger of Matra Marconi Space (France/UK) and the space division of DaimlerChrysler Aerospace (Germany)) is well known as the author of the "Router requirements spec" (Steve Parkes, University of Dundee).
" ETD-031 'SpaceWire Router Development, Coordination and Validation' was Kicked-Off with Astrium the 2nd
January 2002. " And the issue 1 rev 5 had been published on 28.02.2003.
They described a router ASIC with internal configuration port,external pins for status/error monitoring
(with status/error registers and control registers) in Feb,2004.It had been implemented in an Atmel MH1RT
gate array.
www.astrium.eads.net
http://www.astrium.eads.net
 
3) Austrian Aerospace (AAE) has a switch ASIC, the Dynamic Switch Matrix (DSM), built in Atmel.
4) Austrian Aerospace (AAE) has a switch ASIC, the Dynamic Switch Matrix (DSM), built in Atmel.
" ESM-006 'SpaceWire Router ASIC development' is an ETD-031 sub-contract with Austrian Aerospace concerning
the SpaceWire CODEC VHDL, router FPGA and router ASIC. "
www.space.at
http://www.space.at
 
4) 4links derives from University of Dundee is a company that specializes in SpaceWire / IEEE1355 &Ethernet.
5) 4links derives from University of Dundee is a company that specializes in SpaceWire / IEEE1355 &Ethernet.
They have some products such as EtherSpaceLink, SpaceWire-cPCI,SpaceWire-PCI,SpaceWire-Cables,and
IPs which are relative to these products. They use Xilinx fpga implement routers with a performance
well above 200 Mbit/s.
www.4links.co.uk/index.htm
http://www.4links.co.uk/index.htm
 
5) Webs of Chinese laboratory of avionics(for space use) say they are developing a SpW network system.
www.spacee.net
6) Webs of Chinese laboratory of avionics(for space use) say they are developing a SpW network system.
http://www.spacee.net
 
6) Atmel offer SMCS332,SMCS Lite,and said their "potential future Standard ASICs & IPs include:SMCS Lite,
7) Atmel offer SMCS332,SMCS Lite,and said their "potential future Standard ASICs & IPs include:SMCS Lite,
SpaceWire Router(2004),SpaceWire Rx/Tx" in 2002.
www.atmel.com
http://www.atmel.com
7) STAR-Dundee Ltd is a spin-out company of the University of Dundee set up specifically to support users
8) STAR-Dundee Ltd is a spin-out company of the University of Dundee set up specifically to support users
of SpaceWire(fund from the Scottish Executive). Dr Steve Parkes was the Managing Director of STAR-Dundee,
also the author of the SpaceWire standard document. "STAR-Dundee Ltd aims to fill the emerging market
niche for research and development, debug and support tools for SpaceWire."
But now STAR-Dundee Ltd offers many products like SpaceWire CompactPCI board,SpaceWire Router-USB for business. A few data sheets were published in March 24th,2005.
 
Dr Steve Parkes: sparkes@computing.dundee.ac.uk
Press Officer: j.m.marra@dundee.ac.uk
 
www.dundee.ac.uk
http://star-dundee.com/
http://www.dundee.ac.uk
 
8) Institute of Microelectronics, Micromechanics and Microoptics
Hochschule Bremen ,University of Applied Sciences,Germany
Spacewire interface (IP-Core)
http://www.i3m.hs-bremen.de/internet/structure/elis/
9) :--) Ask Google for more and fresh news.
 
9) :-> Ask Google for more and fresh news.
 
 
 
 
 

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