Adaptive ECC Correction in Memory Arrays for Lower Power
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Solution Overview
Problem
Existing memory devices face excessive power consumption due to Error Correction Code (ECC) being calibrated at a constant correction power throughout the life of the memory array, leading to inefficient power usage.
Innovation Solution
Adaptive ECC power management that adjusts correction power based on the number of detected errors, enabling selective activation of ECC circuit portions to optimize power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ECC is calibrated at constant correction power throughout the life of the memory array, then reliability is maintained, but power consumption increases excessively
Solution Approach 1:
The ECC correction power is made dynamic rather than static. The system continuously monitors the number of errors in memory cells and adjusts the ECC correction power accordingly. When error rates are low, the correction power is reduced; when error rates increase, the correction power is increased to maintain reliability. This dynamic adaptation resolves the contradiction by allowing the system to maintain reliability only when necessary, thereby reducing excessive power consumption during periods when fewer corrections are needed.
Solution Approach 2:
The system changes the operational parameters of the ECC circuit based on the actual error conditions. By monitoring error rates and adjusting the correction power parameter, the system optimizes the balance between reliability and power consumption. This parameter change allows the ECC circuit to operate at lower power levels when high correction capability is not required, while still maintaining adequate reliability when errors increase.
2Reliability
If maximum ECC correction power is used throughout the entire life of the array, then error correction reliability is ensured, but power consumption becomes inefficient
Solution Approach 1:
Instead of always applying maximum ECC correction power (excessive action), the system applies only the necessary correction power based on actual error conditions (partial action). By monitoring the number of errors and adjusting the correction power accordingly, the system avoids the energy waste of using maximum correction capability when fewer corrections are needed, while still ensuring data integrity when errors occur.
Solution Approach 2:
The system implements a feedback mechanism where the error rate is continuously monitored and used to adjust the ECC correction power. This closed-loop control ensures that the correction power is optimized based on actual conditions, preventing excessive power consumption while maintaining data integrity. The feedback from error monitoring directly influences the correction power level, creating an adaptive system that balances reliability and energy efficiency.
Data Source
AI summary
Operating an array of memory cells can include storing user data in memory cells of the memory array, storing parity data associated with the user data in a number of parity cells of the memory array, the parity data corresponding to selectable Error Correction Code (ECC) correction capabilities from a minimum ECC correction capability to a maximum ECC correction capability, calculating an ECC syndrome from the stored user data and parity data, based on the ECC syndrome, determining a number of errors in the data, and, based on the determined number of errors, selecting an ECC correction capability of the plurality of ECC correction capabilities. Related memory devices and systems are also herein disclosed.