Adaptive Data Capture Circuits for Continuous Timing Calibration
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Solution Overview
Problem
Existing data interface timing calibration methods disrupt normal system operation and are inefficient in compensating for timing drift over time, particularly in dynamic memory interfaces, where changes in system-level delays and jitter occur.
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 delta values to update delay settings and minimizing jitter effects, enabling frequent recalibrations without affecting system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing calibration methods are used, then timing accuracy is improved, but system operation is disrupted
Solution Approach 1:
The patent divides the data path into two separate segments: a mission data path for normal data transmission and a reference data path for timing calibration. This segmentation allows calibration operations to be performed on the reference path without interrupting data traffic on the mission path, thereby maintaining system operation continuity while achieving timing accuracy improvements.
Solution Approach 2:
The patent introduces a reference data path as an intermediary structure that mimics the mission data path's timing characteristics. By performing calibration on this intermediate reference path and then transferring the calibrated timing parameters to the mission path, the system achieves accurate timing calibration without directly disrupting normal data operations.
2Reliability
If frequent recalibration is performed, then timing drift compensation is improved, but system bandwidth is reduced
Solution Approach 1:
By segmenting the calibration function onto a separate reference data path, the patent enables frequent recalibration operations without consuming mission data path bandwidth. The reference path can be recalibrated continuously or at high frequency while the mission path maintains full data transmission capacity, thus improving timing drift compensation without sacrificing system bandwidth.
Solution Approach 2:
The patent implements continuous timing calibration by constantly monitoring and adjusting the reference data path's timing parameters. This continuous calibration action ensures timing drift is compensated in real-time without requiring periodic interruptions to the mission data path, maintaining both reliability and productivity.
3Speed
If parallel calibration paths are implemented, then calibration speed is improved, but device complexity increases
Solution Approach 1:
The patent segments the calibration function into a dedicated reference data path that operates in parallel with the mission data path. This segmentation enables simultaneous calibration operations without requiring complex coordination between multiple calibration points, achieving fast calibration speed with manageable circuit complexity.
Solution Approach 2:
The reference data path is designed as a simplified copy or replica of the mission data path's timing structure. By copying only the essential timing-critical elements rather than duplicating the entire data path, the patent achieves parallel calibration capability while minimizing the increase in device complexity.
Data Source
AI summary
A data interface circuit wherein calibration adjustments for data bit capture are made without disturbing normal system operation, is described. A plurality of DLL capture and delay circuits for sampling a trained optimal sampling point as well as leading and trailing sampling points are defined. A first stream of data bits is input to the data interface circuit and using a first calibration method, a first optimal sampling point for sampling the data bits input is established. A second stream of data bits is input to the data interface circuit during normal system operation. A second calibration method is performed that is different from the first, the second calibration method being performed whereby: at least one reference data path is established for sampling transition edges of the second stream of data bits input to the data interface during normal system operation.