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Proceedings Paper

Area-, power-, and pin-efficient bus structures using multi-bit-differential signaling
Author(s): Donald M. Chiarulli; Jason D. Bakos; Joel R. Martin; Steven P. Levitan
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Paper Abstract

This paper describes a new low-power, area-, and pin-efficient alternative to differential encoding for high-performance chip-to-chip and backplane signaling. The technique, called multi-bit-differential-signaling (MBDS), consists of a new design for the driver and link termination network coupled with a novel coding system based on “N choose M (nCm)” codes. In an nCm-coded MBDS channel, there are n physical interconnections over which all code symbols carry exactly m 1-bits. This property gives MBDS links signal-to-noise and transmission characteristics comparable to pair-wise differential links such as low-voltage differential signaling (LVDS). Moreover, MBDS is compatible with commercial LVDS receivers in point-to-point and multi-point bus topologies. However, because MBDS channels have a higher information density, they use up to 45% less power and up to 45% fewer I/O pads than equivalent differentially encoded buses.

Paper Details

Date Published: 30 June 2005
PDF: 7 pages
Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); doi: 10.1117/12.608544
Show Author Affiliations
Donald M. Chiarulli, Univ. of Pittsburgh (United States)
Jason D. Bakos, Univ. of Pittsburgh (United States)
Joel R. Martin, Univ. of Pittsburgh (United States)
Steven P. Levitan, Univ. of Pittsburgh (United States)

Published in SPIE Proceedings Vol. 5837:
VLSI Circuits and Systems II
Jose Fco. Lopez; Francisco V. Fernandez; Jose Maria Lopez-Villegas; Jose M. de la Rosa, Editor(s)

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