This paper introduces a new temperature dependent
timing model that allows designers to deal with accurate temperature
dependent delays in logic simulations. In this proposal
we present the latest enhancements in the CellTherm logithermal
simulator developed in the Department of Electron
Devices, BME, Hungary.With the proposed accurate temperature
dependent timing model thermal effects affecting delays in
digital standard cell integrated circuits can be modeled with
delay-temperature functions. In order to establish the model
preliminary delay-temperature characterization is needed for the
standard cells building up the circuit.We propose the extension of
the industry standard Liberty format developed by Synopsys with
the new model.With the new accurate model we demonstrate that
present temperature-timing models do not describe temperature
dependent operation sufficiently. In our presented model timing
and power data can be parameterized by temperature vectors. It
is also demonstrated that taking temperature dependent delays
into account allows for more precise power modeling that is
critical in low-power nanometer integrated systems.
András Timár, Márta Rencz
Budapest University of Technology and Economics
Department of Electron Devices
Budapest, Hungary 1111
Email: timar|rencz@eet.bme.hu