Memory Timing Drift Calibration via Oscillator Frequency Measurement
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Solution Overview
Problem
Integrated circuit devices, particularly memory devices, face significant timing drift due to temperature changes, which can lead to performance issues and power management challenges in multi-rank memory systems.
Innovation Solution
The implementation of a timing drift measurement mechanism within memory devices, utilizing an oscillator circuit to measure frequency changes, which are then used to derive timing parameter updates. A memory controller coordinates these measurements and adjusts the timing calibration interval dynamically based on the measured timing drift.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If timing calibration is performed frequently to maintain accurate signal timings, then timing accuracy is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic timing calibration by continuously monitoring temperature changes and adjusting calibration frequency accordingly. When temperature drift exceeds thresholds, calibration is triggered; otherwise, the system operates without calibration, optimizing the balance between timing accuracy and power consumption
Solution Approach 2:
The system incorporates temperature sensing and drift detection feedback mechanisms that monitor environmental conditions and signal timing variations. This feedback drives adaptive calibration decisions, enabling the system to perform calibration only when necessary based on actual drift conditions rather than on a fixed schedule
2Use of energy by moving object
If timing calibration is performed less frequently to reduce power consumption, then power efficiency is improved, but timing accuracy deteriorates
Solution Approach 1:
The system performs self-diagnosis through temperature sensing and drift detection, automatically determining when calibration is needed without external intervention. This self-service approach ensures timing accuracy is maintained only when drift actually occurs, avoiding unnecessary power consumption from routine calibrations
3Reliability
If the memory device wakes up from low-power state frequently to perform timing calibration, then timing drift is reduced, but power management efficiency deteriorates
Solution Approach 1:
The system performs preliminary temperature assessment and drift detection before deciding to wake up for calibration. By evaluating drift thresholds in advance, the system avoids unnecessary wake-ups and maintains power management efficiency while still mitigating timing drift when it becomes significant
4Stability of the object's composition
If temperature compensation is applied continuously to counteract timing drift, then timing stability is improved, but computational complexity increases
Solution Approach 1:
The system adjusts calibration parameters dynamically based on temperature ranges and drift rates. By changing calibration parameters adaptively rather than applying continuous compensation, the system maintains timing stability while reducing computational complexity through selective, parameter-driven calibration events
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively mitigates timing drift in memory devices, improving system performance and power management by allowing for adaptive timing calibration, reducing unnecessary power consumption, and maintaining accurate signal timings.
Implementation Method 1
This large temperature-drift-rate can cause a significant timing drift over a short period of time, for example, because of the temperature sensitivity of clock distribution circuits (ps/degC) in a memory device
Data Source
AI summary
The disclosed embodiments relate to components of a memory system that support timing-drift calibration. In specific embodiments, this memory system contains a memory device (or multiple devices) which includes a clock distribution circuit and an oscillator circuit which can generate a frequency, wherein a change in the frequency is indicative of a timing drift of the clock distribution circuit. The memory device also includes a measurement circuit which is configured to measure the frequency of the oscillator circuit.