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Reliability Improvement in Network on Chips against Crosstalk Fault Considering Five-Wire Latency Model

Mahdavi, Zeinab | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49234 (19)
  4. University: Sharif University of Technology
  5. Department: Computer Engineering
  6. Advisor(s): Miremadi, Ghasem
  7. Abstract:
  8. One of the major challenges that threat the reliability of NoC-based systems is Crosstalk fault. Some effects of crosstalk fault such as Rising/falling delays and rising/falling speed-ups lead to the variations in channel delay, incorrect data transmission, and extra power consumption in NoC communication channels. Crosstalk fault is data dependent and the intensity of this fault seriously depends on the transition patterns appearing on the wire during the data traversal between processing elements. Most of mechanisms tackling crosstalk fault that are discussed in literature are based on 3-wire delay model. In 3-wire delay model, one wire is considered as victim wire and classification of transition patterns is done based on a pair of adjacent wires on this victim wire. However, 3-wire delay model has limited accuracy in deep submicron technology. To improve accuracy, 5-wire delay model has been proposed recently. In 5-wire delay model, classification of transition patterns is done based on two pair of adjacent wires on victim wire. In this thesis, first, an efficient numerical-based One-Lambda Code called Low Overhead One-Lambda Code (LO-OLC) is proposed that benefits from a numerical system that can omit OLC-induced transition patterns completely and reduce crosstalk-induced delay and power consumption of communication channels by 70%. Evaluation results show that in comparison with other state-of-the-art numerical-based OLCs, LO-OLC can reduce area, critical path and power consumption overheads of codec by an average of 20%, 52% and 45% respectively. Also, by increasing the bus width, the increased overhead is changed from exponential to linear. Therefore, using partial coding in LO-OLC mechanism will reduce overheads imposed on the network. In the second part of this thesis, an accurate crosstalk model based on 5-wire delay model is proposed to estimate the delay of communication channels of NoCs in the presence of crosstalk fault. According to the results and compared to previous model, the proposed model provides about three orders of magnitude speed-up while having error below 8%
  9. Keywords:
  10. Crosstalk Fault ; Reliability ; Network-on-Chip (NOC) ; Five Wire Delay Model

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