This paper presents theory and practical implementation of a method for multi-level logic synthesis of speed-independent circuits. An initial circuit implementation is assumed to satisfy the monotonous cover conditions but is technology independent. The proposed method performs both combinational (inserting new gates) and sequential (inserting new memory elements) decomposition of complex gates in a given standard cell library, while preserving original behaviour and speed-independence. The algorithm applies known efficient algebraic factorization techniques from combinational multi-level logic synthesis, but achieves also boolean simplification and sequential decomposition. The method allows sharing of decomposed logic.

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