30 June 2005 Area-, power-, and pin-efficient bus structures using multi-bit-differential signaling
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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.
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Donald M. Chiarulli, Donald M. Chiarulli, Jason D. Bakos, Jason D. Bakos, Joel R. Martin, Joel R. Martin, Steven P. Levitan, Steven P. Levitan, } "Area-, power-, and pin-efficient bus structures using multi-bit-differential signaling", Proc. SPIE 5837, VLSI Circuits and Systems II, (30 June 2005); doi: 10.1117/12.608544; https://doi.org/10.1117/12.608544
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