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Real-Time Communication Analysis for On-Chip Networks with Wormhole Switching

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2 Author(s)
Zheng Shi ; Univ. of York, York ; Burns, A.

In this paper, we discuss a real-time on-chip communication service with a priority-based wormhole switching policy. A novel off-line schedulability analysis approach is presented. By evaluating diverse inter-relationships among the traffic-flows, this approach can predict the packet network latency based on two quantifiable different delays: direct interference from higher priority traffic-flows and indirect interference from other higher priority traffic-flows. Due to the inevitable existence of parallel interference, we prove that the general problem of determining the exact schedulability of real-time traffic-flow over the on- chip network is NP-hard. However the results presented do form an upper bound. In addition, an error in a previous published scheduling approach is illustrated and remedied. Utilizing this analysis scheme, we can flexibly evaluate at design time the schedulability of a set of traffic-flows with different QoS requirements on a real-time SoC/NoC communication platform.

Published in:

Networks-on-Chip, 2008. NoCS 2008. Second ACM/IEEE International Symposium on

Date of Conference:

7-10 April 2008

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