Adaptive Data Capture Timing for Non-Disruptive Interface Calibration
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Solution Overview
Problem
Existing data interface timing calibration methods disrupt normal system operation and are not dynamic enough to compensate for changes over time, such as those caused by temperature fluctuations or frequency/voltage scaling, leading to signal skew and jitter issues.
Innovation Solution
A continuously adaptive timing calibration system that establishes a reference data path for calibration, allowing for real-time adjustments to the mission data path without interrupting signal traffic, using multiple parallel calibrations and minimizing jitter effects, and performing recalibrations during normal system operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional timing calibration methods are used, then timing alignment can be corrected, but normal system operation is disrupted
Solution Approach 1:
The patent divides the calibration system 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 without disrupting mission-critical operations, as the reference path can be calibrated independently while the mission path continues to function with previously established timing parameters.
Solution Approach 2:
The patent performs timing calibration in advance on the reference path before mission operations begin. The calibration establishes timing parameters that are then applied to the mission path, allowing normal operations to proceed without interruption. This preliminary calibration action ensures timing alignment is established before data transmission begins.
2Reliability
If static calibration is performed, then initial timing alignment is achieved, but changes in temperature and voltage cause signal skew and jitter
Solution Approach 1:
The patent implements a feedback mechanism where the calibrated timing parameters from the reference path are continuously monitored and adjusted based on detected signal characteristics. This feedback loop allows the system to adapt to changes in temperature, voltage, and other environmental factors by automatically adjusting timing parameters to maintain optimal alignment between data and strobe signals.
Solution Approach 2:
The patent transitions from static calibration to dynamic calibration by enabling continuous or periodic recalibration of timing parameters during system operation. The calibration system adapts to changing environmental conditions by adjusting timing parameters in real-time, making the system responsive to temperature fluctuations, voltage changes, and frequency variations that occur during normal operation.
3Measurement precision
If frequent recalibration is performed, then timing accuracy is maintained under changing conditions, but system complexity increases
Solution Approach 1:
The patent creates a reference path that copies the essential characteristics of the mission path, allowing calibration operations to be performed on the reference path and then applied to the mission path. This copying approach simplifies the calibration system by using a dedicated reference path that mimics mission operations without requiring complex real-time analysis of actual mission data, thereby maintaining timing accuracy while controlling system complexity.
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.