Bit Stream Transformation for Parallel Data Interface Power Optimization
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Solution Overview
Problem
Parallel data interfaces in electronic devices face issues such as power supply ripple and increased power consumption due to bit transitions, which affect sensitive components like RF sampling transceivers and analog front-ends, and existing solutions like differential traces and dummy transitions are either impractical or insufficient.
Innovation Solution
The implementation of transition control circuitry that receives input bit streams, determines a bit transformation pattern, and generates output bit streams with more bits to reduce bit transition variance and total transitions on parallel data interface lanes, thereby mitigating power supply ripple and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the number of transitions on parallel data interface lanes increases, then data transmission capability is improved, but power consumption increases
Solution Approach 1:
The patent transforms the bit stream by modifying the transition pattern parameters while maintaining data integrity. The transition control circuitry applies transformation patterns that limit the number of transitions between consecutive data words, thereby reducing switching activity and power consumption without compromising the data transmission capability.
2Speed
If transitions on parallel data interface lanes increase, then data transmission rate is improved, but power supply ripple increases
Solution Approach 1:
The patent changes the transition pattern parameters of the bit stream to reduce the frequency and number of transitions. By controlling the transition density through transformation patterns, the patent reduces the harmful power supply ripple effects while maintaining the data transmission rate.
Solution Approach 2:
The transition control circuitry acts as an intermediary between the data source and the parallel data interface. It transforms the original bit stream into a modified version that maintains data integrity but reduces transition activity, thereby mitigating the power supply ripple before the data reaches the interface lanes.
3Productivity
If simultaneous switching activity increases, then data transmission capability is improved, but output driver performance deteriorates
Solution Approach 1:
The patent modifies the transition pattern parameters to reduce simultaneous switching activity across the parallel data interface lanes. By controlling the temporal distribution of transitions through transformation patterns, the patent reduces the burden on output drivers and prevents performance deterioration while maintaining data transmission capability.
4Use of energy by moving object
If bit stream is transformed to reduce transitions, then power consumption is reduced, but coding complexity increases
Solution Approach 1:
The patent applies partial transformation by using a predefined set of transformation patterns rather than exhaustive optimization. The transition control circuitry selects from multiple predefined patterns to achieve sufficient transition reduction without implementing overly complex coding schemes, thereby balancing power consumption reduction with acceptable coding complexity.
Data Source
AI summary
A circuit includes: a parallel data interface; and transition control circuitry coupled to the parallel data interface. The transition control circuitry is configured to: receive an input bit stream sample; determine a bit transformation pattern for the input bit stream sample in accordance with a target criteria; and generate an output bit stream symbol from the input bit stream sample and the bit transformation pattern, wherein the output bit stream symbol has more bits than the input bit stream sample.