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- W4234504604 abstract "Digital circuits are called combinational if they are memoryless: they have outputs that depend only on the current values of the inputs. Combinational circuits are generally thought of as acyclic (i.e., feed-forward) structures. And yet, cyclic circuits can be combinational. Cycles sometimes occur in designs synthesized from high-level descriptions. Feedback in such cases is carefully contrived, typically occurring when functional units are connected in a cyclic topology. Although the premise of cycles in combinational circuits has been accepted, and analysis techniques have been proposed, no one has attempted the synthesis of circuits with feedback at the logic level.We propose a general methodology for the synthesis of multilevel combinational circuits with cyclic topologies. Our approach is to introduce feedback in the substitution / minimization phase, optimizing a multilevel network description for area. In trials with benchmark circuits, many were optimized significantly, with improvements of up to 30% in the area. superior to acyclic.We argue the case for radically rethinking the concept of combinational in circuit design: we should no longer think of combinational logic as acyclic in theory or in practice, since nearly all combinational circuits are best designed with cycles." @default.
- W4234504604 created "2022-05-12" @default.
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- W4234504604 date "2003-01-01" @default.
- W4234504604 modified "2023-09-26" @default.
- W4234504604 title "The synthesis of cyclic combinational circuits" @default.
- W4234504604 doi "https://doi.org/10.1145/775870.775875" @default.
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