Data Bit Inversion Bus Reduces Coupling and Current

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Solution Overview

Problem

In high bandwidth applications, long distance bi-directional data buses experience coupling effects and timing mismatches due to simultaneous data shifting on multiple bus lines, leading to increased current consumption and potential malfunctions, particularly in high bandwidth memory systems with numerous data bus lines.

Innovation Solution

The implementation of data bit inversion (DBI) technology, which inverts data bits and includes a DBI signal to indicate inversion, reduces power consumption by minimizing simultaneous changes on adjacent data bus lines, thereby reducing coupling effects and current consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If data is transmitted simultaneously on multiple bus lines, then data transmission speed is improved, but coupling effects and timing mismatches occur leading to increased current consumption

Engineering Contradiction:

Improvedata transmission speedVSAvoidcurrent consumption

Core Design Contradiction:

SpeedVSUse of energy by moving object

Solution Approach 1:

The patent applies data bit inversion (DBI) technology that inverts data bits before transmission. By inverting data bits, the patent reduces simultaneous transitions on adjacent bus lines, thereby reducing coupling effects and current consumption while maintaining high-speed data transmission capability

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the state parameters of data bits through inversion. The DBI calculator inverts data bits based on transition detection, changing the electrical characteristics of the signal to reduce simultaneous switching activity and associated current consumption

Inventive Principle:

Principle #35Parameter changes

2Productivity

If data is transmitted simultaneously on multiple bus lines, then data transmission bandwidth is improved, but coupling effects occur leading to timing mismatches and potential malfunctions

Engineering Contradiction:

Improvedata transmission bandwidthVSAvoidsignal integrity

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The patent applies data bit inversion (DBI) technology that inverts data bits before transmission. By inverting data bits, the patent reduces simultaneous transitions on adjacent bus lines, thereby reducing coupling effects and timing mismatches while maintaining high-bandwidth data transmission

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent introduces a DBI signal as an intermediary that indicates whether data bits have been inverted. The receiver uses this DBI signal to properly interpret the inverted data, ensuring reliable data recovery while benefiting from reduced coupling effects

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10915487B2Switching reduction bus using data bit inversion

Publication Date: 2021.02.09 MICRON TECHNOLOGY INC

AI summary

Apparatus and methods structured with respect to a data bus having a number of data lines and a number of shield lines can be implemented in a variety of applications. Such apparatus and methods can include driver and receiver circuits that operate to generate and/or decode a data bit inversion signal associated with data propagated on data lines of the data bus. The driver and receiver circuits may be arranged to operate on a two bit basis to interface with the data bus having data lines grouped with respect to the two bits with shield lines for the respective two bit data lines.