Automatic verification of implementations against their specifications in the design hierarchy is largely based on state machine comparison. This paper presents a simple technique that exploits information about correspondence between registers in the data path to enable abstraction of data path registers and make automatic verification of circuits with large date paths tractable. Correspondence between registers which encode the control states is not required. This generality enables efficient verification of large circuits with data paths structured differently, as well as verification against specifications devoid of structural information. Results are presented for the verification of realistic circuits at different levels in the design hierarchy.
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