基于模板的电路理解

Adrià Gascón, Pramod Subramanyan, B. Dutertre, A. Tiwari, Dejan Jovanovic, S. Malik
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引用次数: 46

摘要

当验证或逆向工程数字电路时,人们通常希望识别和理解较大系统中的小组件。一种可能的方法是表明所研究的子电路在功能上等同于参考实现。在许多情况下,这项任务很困难,因为人们可能没有关于两个电路的输入和输出之间映射的完整信息,或者因为等效性取决于控制输入的设置。我们提出一种基于模板的方法来自动化这个过程。它通过表示低级组合电路相当于参考实现来提取其功能描述,同时合成适当的输入输出信号映射和控制信号设置。该方法依赖于使用SMT求解器解决存在/所有问题,以及基于签名计算的修剪技术。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Template-based circuit understanding
When verifying or reverse-engineering digital circuits, one often wants to identify and understand small components in a larger system. A possible approach is to show that the sub-circuit under investigation is functionally equivalent to a reference implementation. In many cases, this task is difficult as one may not have full information about the mapping between input and output of the two circuits, or because the equivalence depends on settings of control inputs. We propose a template-based approach that automates this process. It extracts a functional description for a low-level combinational circuit by showing it to be equivalent to a reference implementation, while synthesizing an appropriate mapping of input and output signals and setting of control signals. The method relies on solving an exists/forall problem using an SMT solver, and on a pruning technique based on signature computation.
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