Abstract
The clock distribution and generation circuitry forms a critical component of current synchronous digital systems and is known to consume at least a quarter of the power budget of existing microprocessors. We propose and validate a high level model for evaluating the energy dissipation of the clock generation and distribution circuitry, including both the dynamic and leakage power components. The validation results show that the model is reasonably accurate, with the average deviation being within 10% of SPICE simulations. Access to this model can enable further research at high-level design stages in optimizing the system clock power. To illustrate this, a few architectural modifications are considered and their effect on the clock subsystem and the total system power budget is assessed.
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