DesignCon 2013 Time Domain and Statistical Model Development, Simulation and Correlation Methods for High Speed SerDes

IBIS Algorithmic Modeling Interface (IBIS-AMI) defines two approaches to SerDes modeling and simulation flow: time domain or bit-by-bit simulation for nonlinear and/or time variant (NLTV) model and statistical simulation for linear and time invariant (LTI) model. Statistical simulation has advantages of faster simulation speed and arbitrary low BER floor under linear model assumption. However, majority high speed SerDes devices incorporation clock and data recovery (CDR) circuit and/or adaptation state machines which are not conducive to LTI modeling. This paper presents a unified SerDes modeling method for both simulation types. The results show close correlation between time and statistical simulations based on selected criteria. This paper demonstrates the feasibility of dual model approach to IBIS-AMI and summarizes simulation methods that are unique to each.