We present various 4-bit× 4-bit unsigned multipliers designed using the delay-insensitive convention logic (NCL) paradigm. They represent bit-serial, iterative, and fully parallel multiplication architectures. NCL is a self-timed logic paradigm in which control is inherent in each datum. NCL follows the so-called weak conditions of Seitz's delay-insensitive signaling scheme. Like other delay-insensitive logic methods, the NCL paradigm assumes that forks in wires are isochronic. NCL uses symbolic completeness of expression to achieve delay-insensitive behavior. Simulation results show a large variance in circuit performance in terms of power, area, and speed. This study serve as a good reference for designers who wish to accomplish high-performance, low-power implementations of clockless digital VLSI circuits.


Electrical and Computer Engineering

Keywords and Phrases

VLSI; Asynchronous Circuits; Bit-Serial Architecture; Circuit Performance; Circuit Simulation; Clockless Digital VLSI Circuit; Convention Logic; Delay-Insensitive Method; Delay-Insensitive Signaling Scheme; Digital Arithmetic; Iterative Architecture; Logic Design; Multiplying Circuits; Parallel Architectures; Parallel Multiplication Architecture; Self-Timed Multiplier Design

International Standard Serial Number (ISSN)


Document Type

Article - Journal

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Final Version

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