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Design and characterization of null convention self-timed multipliers

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3 Author(s)
S. K. Bandapati ; Missouri Univ., Rolla, MO, USA ; S. C. Smith ; M. Choi

We present various 4-bit /spl times/ 4-bit unsigned multipliers designed using the delay-insensitive null 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.

Published in:

IEEE Design & Test of Computers  (Volume:20 ,  Issue: 6 )