Avoiding Message-Dependent Deadlock in Network-Based Systems on Chip

Hansson, Andreas; Goossens, Kees; Rădulescu, Andrei

doi:https://doi.org/10.1155/2007/95859

VLSI Design

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Networks-on-Chip

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Research Article | Open Access

Volume 2007 | Article ID 095859 | https://doi.org/10.1155/2007/95859

Avoiding Message-Dependent Deadlock in Network-Based Systems on Chip

Andreas Hansson,¹Kees Goossens,^2,3and Andrei Rădulescu³

Academic Editor: Maurizio Palesi

Received16 Nov 2006

Accepted06 Feb 2007

Published30 Apr 2007

Abstract

Networks on chip (NoCs) are an essential component of systems on chip (SoCs) and much research is devoted to deadlock avoidance in NoCs. Prior work focuses on the router network while protocol interactions between NoC and intellectual property (IP) modules are not considered. These interactions introduce message dependencies that affect deadlock properties of the SoC as a whole. Even when NoC and IP dependency graphs are cycle-free in isolation, put together they may still create cycles. Traditionally, SoCs rely solely on request-response protocols. However, emerging SoCs adopt higher-level protocols for cache coherency, slave locking, and peer-to-peer streaming, thereby increasing the complexity in the interaction between the NoC and the IPs. In this paper, we analyze message-dependent deadlock, arising due to protocol interactions between the NoC and the IP modules. We compare the possible solutions and show that deadlock avoidance, in the presence of higher-level protocols, poses a serious challenge for many current NoC architectures. We evaluate the solutions qualitatively, and for a number of designs we quantify the area cost for the two most economical solutions, strict ordering and end-to-end flow control. We show that the latter, which avoids deadlock for all protocols, adds an area and power cost of 4% and 6%, respectively, of a typical Æthereal NoC instance.

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Copyright © 2007 Andreas Hansson et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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