Balanced Coding for Single-Ended Interconnects
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Solution Overview
Problem
Conventional single-ended signaling techniques suffer from significant signal degradation due to cross-talk in high-density, long-distance data transmission configurations, limiting practical transmission distances and requiring costly or power-intensive solutions like fully-differential signaling or analog compensation circuits.
Innovation Solution
A system and method that encodes input data words into balanced code words and transmits them through twisted single-ended interconnects, reducing cross-talk by evenly distributing noise across channels, thereby improving signal integrity and allowing longer-distance, high-speed data transmission without the need for additional resources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fully-differential signaling with twisted channel pairs is used, then cross-talk is reduced, but bandwidth density and energy efficiency are reduced due to requiring twice as many signal wires per channel
Solution Approach 1:
The patent applies balanced coding to convert the harmful effect of cross-talk into a beneficial outcome. By encoding data into balanced code words with equal numbers of 0s and 1s, the signal transitions are balanced, causing cross-talk noise to cancel out evenly across channels. This allows single-ended signaling to achieve cross-talk reduction comparable to differential signaling while maintaining high bandwidth density and energy efficiency.
Solution Approach 2:
The patent changes the parameter of signal encoding from conventional unbalanced binary coding to balanced coding. This parameter change ensures that each code word contains an equal number of 0s and 1s, creating balanced signal transitions that mitigate cross-talk effects. The balanced coding scheme transforms the signal characteristics to achieve cross-talk reduction without requiring additional wires or complex circuitry.
2Object-affected harmful factors
If fully-differential signaling with twisted channel pairs is used, then cross-talk is reduced, but energy efficiency is reduced due to requiring twice as many signal wires per channel
Solution Approach 1:
The patent applies balanced coding to convert the harmful effect of cross-talk into a beneficial outcome. By encoding data into balanced code words with equal numbers of 0s and 1s, the signal transitions are balanced, causing cross-talk noise to cancel out evenly across channels. This allows single-ended signaling to achieve cross-talk reduction comparable to differential signaling while maintaining high bandwidth density and energy efficiency.
Solution Approach 2:
The patent replaces the expensive and energy-intensive fully-differential signaling approach with a simpler, more energy-efficient balanced coding scheme. Instead of using twice as many wires and complex differential circuitry, the invention uses software-based balanced encoding that can be implemented with simple logic circuits, dramatically reducing energy consumption while achieving the same cross-talk mitigation效果.
3Object-affected harmful factors
If analog compensation circuits are added to the receiver and/or transmitter, then cross-talk is compensated, but power consumption and die area increase significantly
Solution Approach 1:
The patent applies balanced coding to convert the harmful effect of cross-talk into a beneficial outcome. By encoding data into balanced code words with equal numbers of 0s and 1s, the signal transitions are balanced, causing cross-talk noise to cancel out evenly across channels. This allows single-ended signaling to achieve cross-talk reduction comparable to differential signaling while maintaining high bandwidth density and energy efficiency.
Solution Approach 2:
The patent replaces complex analog compensation circuits with a digital balanced coding scheme. Instead of using analog equalizers and compensation hardware that consume significant power and occupy large die area, the invention uses digital balanced encoding that can be implemented with simple logic circuits or even software, dramatically reducing device complexity while achieving cross-talk mitigation.
4Productivity
If conventional single-ended signaling is used, then bandwidth density and energy efficiency are maintained, but transmission distance is limited to a few millimeters due to cross-talk
Solution Approach 1:
The patent applies balanced coding to convert the harmful effect of cross-talk into a beneficial outcome. By encoding data into balanced code words with equal numbers of 0s and 1s, the signal transitions are balanced, causing cross-talk noise to cancel out evenly across channels. This allows single-ended signaling to achieve cross-talk reduction comparable to differential signaling while maintaining high bandwidth density and energy efficiency.
Solution Approach 2:
The patent changes the parameter of signal encoding from conventional unbalanced binary coding to balanced coding. This parameter change ensures that each code word contains an equal number of 0s and 1s, creating balanced signal transitions that mitigate cross-talk effects. The balanced coding scheme transforms the signal characteristics to achieve cross-talk reduction without requiring additional wires or complex circuitry.
Data Source
AI summary
A method for transmitting data advantageously reduces cross-talk in high-speed data transmission. The method comprises receiving an input data word, encoding the input data word into a code word, and driving the code word on to an interconnect for transmission. The code word is generating using a balanced coding scheme, and the interconnect is a single-ended, twisted-wire on-chip fly-over interconnect. A receiver circuit decodes the code word to generate an output data word.