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为了提高超大规模集成电路中全局互连线延时估算的精度,提出了一种基于RLC模型延时估算的方法。该方法将互连系统中的延时分为2部分:电磁波传输延时和波形上升沿延时,并分别进行估算。计算出电磁波传输延时,并消除其对原传输函数的影响得到一个新的传输函数。利用一种稳定的二阶RLC模型对新传输函数进行逼近,估算出波形上升沿延时。实验结果表明:该方法在后者远大于前者的时候,其估算结果至少能保证和传统方法有相同的精度。而在两者大小相当的情况下,该方法能够较大地提高对延时估算的精度。
In order to improve the accuracy of global interconnection delay estimation in VLSI, a method of delay estimation based on RLC model is proposed. The method divides the delay in the interconnection system into two parts: the propagation delay of the electromagnetic wave and the rising edge of the waveform, and estimates separately. Calculate the propagation delay of electromagnetic wave and eliminate its influence on the original transfer function to get a new transfer function. The new transfer function is approximated by a stable second-order RLC model to estimate the rising edge of the waveform. The experimental results show that when the latter is much larger than the former, the proposed method can at least guarantee the same accuracy as the traditional method. In the case of the same size, the method can greatly improve the accuracy of the delay estimation.