Traditional method based on probabilistic transfer matrices (PTM) for estimate the effects of soft errors on gate level circuit reliability can only be used for combinational circuits.In this paper, a method for reliability estimation of sequential circuit based on PTM (S-PTM) is proposed.A sequential circuitis divided into an output logic module and a next state logic module, then the PIM of the sequential circuit is calculated by deduction employing the proposed PTM calculation model for sequential circuits in the paper.Considering probability distribution of the circuit inputs, the reliability of overall circuit is estimated.Experimental results on ISCAS 89 benchmark circuits show that our method is efficient.%传统的概率转移矩阵(Probabilistic Transfer Matrix,PTM)方法是一种能够比较精确地估计软差错对门级电路可靠度影响的方法,但现有的方法只适用于组合逻辑电路的可靠度估计.本文提出基于PTM的时序电路可靠度估计方法(reliability estimation of Sequential circuits based on PTM,S-PTM),先把待评估时序电路划分为输出逻辑模块和次态逻辑模块,然后用本文提出的时序电路PIM计算模型得到电路的PIM,最后根据输入信号的概率分布计算出时序电路的可靠度.用ISCAS 89基准电路为对象进行实验和验证,实验表明所提方法是准确和合理的.
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