Differential I/O Buffer Encoding for Lower Power and Noise
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Solution Overview
Problem
Differential input/output (I/O) buffers face challenges in reducing power consumption and noise, as power consumption and noise vary with data transmission, and existing techniques like Data Bus Inversion (DBI) do not effectively minimize power consumption across all data transitions.
Innovation Solution
Implementing a power-aware scheme that determines and applies selective encoding schemes, such as bit inversions or transition swapping, based on the number of transitions at each clock edge to minimize power consumption and noise, using logic to generate and transmit a 'Scode' for encoding and decoding, which identifies the optimal encoding scheme for each data set.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If Data Bus Inversion (DBI) is used for power reduction, then power consumption is reduced, but noise reduction is not achieved and power consumption varies with data being transmitted
Solution Approach 1:
The patent applies inversion by transmitting the complement of data values (inverted encoding) and inverting the encoding scheme itself. Instead of simply inverting the bus data like traditional DBI, the system inverts the entire encoding approach by sending complement values and using inverted transition swapping, which simultaneously reduces both power consumption and noise generation by minimizing voltage transitions on the differential signal lines
Solution Approach 2:
The patent changes the encoding parameter from simple bit inversion to transition swapping based on voltage levels. The encoding scheme dynamically selects transitions that minimize power consumption and noise by swapping between different voltage transition patterns (e.g., swapping between rising and falling edges), thereby optimizing both power and noise characteristics based on the data being transmitted
2Use of energy by moving object
If encoding schemes are applied to reduce power consumption, then power consumption is reduced, but device complexity increases
Solution Approach 1:
The patent segments the encoding process into distinct components: transition detection logic that identifies voltage transitions, encoding logic that selects optimal transition patterns, and a separate Scode transmission mechanism. This segmentation allows each component to be optimized independently and simplifies the overall implementation by breaking down the complex encoding task into manageable functional blocks
Solution Approach 2:
The system performs preliminary action by pre-defining multiple encoding schemes (including inverted encoding and transition swapping) and selecting the optimal scheme in advance based on the data pattern. The Scode is generated beforehand to indicate the selected encoding scheme, allowing the receiver to prepare for decoding without adding runtime complexity to the transmission process
3Use of energy by moving object
If selective encoding schemes are applied, then power consumption is reduced, but data integrity requirements become more complex
Solution Approach 1:
The patent implements feedback by transmitting the Scode that indicates which encoding scheme was used for the current data transmission. The receiver uses this Scode feedback to correctly interpret and decode the incoming data, ensuring data integrity. The feedback mechanism allows the system to adaptively select encoding schemes while maintaining reliable data transmission through proper synchronization between transmitter and receiver
Data Source
AI summary
An apparatus, system, and method for improved power consumption and/or noise reduction in a differential input/output (I/O) buffer are provided. A circuit can include a differential signal buffer and encoding scheme quantifying and selection circuitry. The encoding scheme quantifying and selection circuitry can be configured to generate a selection code indicating a selected encoding scheme of the encoding schemes based on respective signals indicating whether each respective encoding scheme of encoding schemes has a net positive power consumption reduction in differential signals. The encoding scheme quantifying and selection circuitry can be configured to provide the selection code to an encoder.