Method for Code Evaluation Using ISI Ratio

Abstract

An efficient communications apparatus is described for a vector signaling code to transport data and optionally a clocking signal between integrated circuit devices. Methods of designing such apparatus and their associated codes based on a new metric herein called the “ISI Ratio” are described which permit higher communications speed, lower system power consumption, and reduced implementation complexity.

Description

[0001]This application claims priority to U.S. Provisional Patent Application 61 / 934,803, filed Feb. 2, 2014, naming Ali Hormati and Amin Shokrollahi, entitled “Method for Code Evaluation using ISI Ratio” which is herein incorporated by reference in its entirety for all purposes.REFERENCES[0002]The following references are herein incorporated by reference in their entirety for all purposes:[0003]U.S. Patent Publication 2011 / 0268225 of application Ser. No. 12 / 784,414, filed May 20, 2010, naming Harm Cronie and Amin Shokrollahi, entitled “Orthogonal Differential Vector Signaling” (hereinafter “Cronie I”);[0004]U.S. patent application Ser. No. 13 / 030,027, filed Feb. 17, 2011, naming Harm Cronie, Amin Shokrollahi and Armin Tajalli, entitled “Methods and Systems for Noise Resilient, Pin-Efficient and Low Power Communications with Sparse Signaling Codes”, hereinafter identified as [Cronie II];[0005]U.S. patent application Ser. No. 14 / 158,452, filed Jan. 17, 2014, naming John Fox, Brian Ho...

AI Technical Summary

Benefits of technology

[0025]An efficient communications apparatus is described for a vector signaling code to transport data and optionally a clocking signal between integrated circuit devices. Methods of designing such apparatus and their associated codes based on a new metric herein called the “ISI Ratio” are described which permit higher communications speed, lower system power consumption, and reduced implementation complexity.

Problems solved by technology

This effect is mainly due to properties of the underlying communication channel, and often is the limiting characteristic precluding higher speed or lower error communications.

Beyond such ad-hoc identification of problematic patterns, there is no reliable metric to assess the impact of ISI on communications system performance, nor to suggest channel or coding modifications to mitigate such effects.

On one hand, equalizers can be expensive in terms of implementation complexity, power consumption, and calibration requirements, especially in multi-gigabit / s communication systems.

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