Multi-Symbol Data Inversion for Low-Delay PAM4 Signaling
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Solution Overview
Problem
Existing data inversion methods for multi-symbol signals are inefficient and unpredictable, leading to increased delays and power consumption when inverting or re-inverting data.
Innovation Solution
A method for efficient and predictable data inversion and re-inversion of multi-symbol signals by changing the value of a bit (least significant or most significant bit) or inverting the physical level of the signal across an axis between levels, using modulation schemes like PAM4.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing data inversion methods are used for multi-symbol signals, then data inversion can be performed, but the process is inefficient and unpredictable with increased delays and power consumption
Solution Approach 1:
The patent segments the data inversion process by separating most significant bits (MSBs) from least significant bits (LSBs) and handling them through different inversion paths. MSBs are inverted through a first inversion path while LSBs follow a second inversion path, allowing parallel processing and reducing overall inversion delay. This segmentation enables efficient handling of multi-symbol signals by treating different bit components independently rather than processing the entire symbol sequentially.
2Productivity
If existing data inversion methods are used for multi-symbol signals, then data inversion can be performed, but power consumption increases
Solution Approach 1:
The patent applies local quality by assigning different inversion characteristics to different bit positions within the symbol. MSBs and LSBs are processed with different inversion strategies tailored to their specific requirements. This localized approach optimizes power consumption by applying only the necessary inversion operations to each bit component rather than uniformly processing all bits, thereby reducing overall power usage while maintaining inversion efficiency.
3Reliability
If data symbols are inverted by changing physical levels in multi-symbol signals, then inversion can be achieved, but errors may increase due to unpredictable behavior
Solution Approach 1:
The patent inverts the conventional approach by rather than attempting to physically invert multi-level signals (which is unpredictable and error-prone), the method inverts individual bit components (MSBs and LSBs) separately through dedicated inversion paths. This bitwise inversion strategy reverses the problematic approach of direct physical level inversion, achieving reliable and predictable inversion results by operating at the bit level rather than the symbol level.
Data Source
AI summary
Methods, systems, and devices for data inversion techniques are described to enable a memory device to transmit or receive a multi-symbol signal that includes more than two (2) physical levels. Some portions of some multi-symbol signals may be inverted. A transmitting device may determine to invert one or more data symbols based on one or more parameters. A receiving device may determine that one or more data symbols are inverted and may re-invert the one or more data symbols (e.g., to an original value). When receiving or transmitting a multi-symbol signal, a device may invert or re-invert a data symbol by changing a value of one bit of the data symbol. Additionally or alternatively, a device may invert or re-invert a data symbol of a multi-symbol signal by inverting a physical level of the signal across an axis located between or associated with one or more physical levels.