Ferrandiz, Thomas and Frances, Fabrice and Fraboul, Christian Using Network Calculus to compute end-to-end delays in SpaceWire networks. (2011) SIGBED Review, vol. 8 (n° 3). pp. 44-47. ISSN 1551-3688
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Official URL: http://dl.acm.org/citation.cfm?doid=2038617.2038627
The SpaceWire network standard is promoted by the ESA and is scheduled to be used as the sole on-board network for future satellites. This network uses a wormhole routing mechanism that can lead to packet blocking in routers and consequently to variable end-to-end delays. As the network will be shared by real-time and non real- time traffic, network designers require a tool to check that temporal constraints are verified for all the critical messages. Network Calculus can be used for evaluating worst- case end-to-end delays. However, we first have to model SpaceWire components through the definition of service curves. In this paper, we propose a new Network Calculus element that we call the Wormhole Section. This element allows us to better model a wormhole network than the usual multiplexer and demultiplexer elements used in the context of usual Store-and-Forward networks.
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