Data Interface Timing Capture Calibration Without Traffic Disruption
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Solution Overview
Problem
Existing data interface calibration methods disrupt normal system operation and are inefficient in compensating for timing drifts over time, particularly in dynamic memory interfaces, where skew and jitter issues arise due to system-level delays and temperature changes.
Innovation Solution
A continuously adaptive timing calibration method that establishes a reference data path for calibration, allowing for dynamic adjustments to the mission data path without interrupting signal traffic, using multiple parallel calibrations and minimizing jitter effects, and operating simultaneously with normal system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used to adjust timing parameters, then timing accuracy is improved, but system operation is interrupted and productivity decreases
Solution Approach 1:
The patent divides the calibration function into two separate paths: a reference path used for calibration operations and a mission path used for normal data transmission. This segmentation allows calibration to occur on the reference path without interrupting data flow on the mission path, resolving the contradiction between timing accuracy improvement and system operation continuity.
Solution Approach 2:
The patent introduces a delay element as an intermediary component that can be independently adjusted in the reference path. This delay element serves as a mediator that absorbs timing drift effects, allowing calibration adjustments without affecting the mission path operation, thus maintaining both timing accuracy and operational continuity.
2Stability of the object's composition
If calibration is performed frequently to compensate for timing drift, then timing stability is improved, but system complexity increases
Solution Approach 1:
The patent creates a reference path that copies the essential structure and function of the mission path but is isolated for calibration purposes. This copy allows frequent calibration operations to be performed without affecting the mission path, achieving timing stability through continuous calibration while keeping the added complexity contained within the reference path only.
3Measurement precision
If delay adjustments are made to compensate for skew, then signal timing is improved, but jitter effects worsen
Solution Approach 1:
The patent implements dynamic delay adjustment where the delay element in the reference path can be continuously tuned based on detected timing drift. This dynamic adjustment allows the system to adapt to changing conditions and optimize timing while minimizing jitter effects through continuous optimization rather than fixed adjustments.
Data Source
AI summary
A method for operating a data interface circuit whereby calibration adjustments for data bit capture are made without disturbing normal system operation includes initially establishing, using a first calibration method where a data bit pattern received by the data interface circuit is predictable, an optimal sampling point for sampling data bits received by the data interface circuit, and during a normal system operation and without disturbing the normal system operation, performing a second calibration method where the data bit pattern received by the data interface circuit is unpredictable. The second calibration method determines an amount of a timing drift for received data bit edge transitions and adjusts the optimal timing point determined by the first calibration method to create a revised optimal timing point. The second calibration method samples fringe timing points associated with the transition edges of a data bit.