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Circuit propagation delay estimation through multivariate regression-based modeling under spatio-temporal variability
Ganapathy, Shrikanth; Canal Corretger, Ramon; González Colás, Antonio María; Rubio Sola, Jose Antonio
Universitat Politècnica de Catalunya. Departament d'Arquitectura de Computadors; Universitat Politècnica de Catalunya. Departament d'Enginyeria Electrònica; Universitat Politècnica de Catalunya. ARCO - Microarquitectura i Compiladors; Universitat Politècnica de Catalunya. HIPICS - Grup de Circuits i Sistemes Integrats d'Altes Prestacions
With every process generation, the problem of variability in physical parameters and environmental conditions poses a great challenge to the design of fast and reliable circuits. Propagation delays which decide circuit performance are likely to suffer the most from this phenomena. While Statistical static timing analysis (SSTA) is used extensively for this purpose, it does not account for dynamic conditions during operation. In this paper, we present a multivariate regression based technique that computes the propagation delay of circuits subject to manufacturing process variations in the presence of temporal variations like temperature. It can be used to predict the dynamic behavior of circuits under changing operating conditions. The median error between the proposed model and circuit-level simulations is below 5%. With this model, we ran a study of the effect of temperature on access time delays for 500 cache samples. The study was run in 0.557 seconds, compared to the 20h and 4min of the SPICE simulation achieving a speedup of over 1??105. As a case study, we show that the access times of caches can vary as much as 2.03?? at high temperatures in future technologies under process variations.
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria electrònica::Microelectrònica::Circuits integrats
Integrated circuits -- Design and construction
Cache storage
Delays
Integrated circuit modelling
Regression analysis
Timing
Circuits integrats -- Disseny i construcció
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Institute of Electrical and Electronics Engineers (IEEE)
         

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