Strobe Signal Delay Calibration for Data Storage Devices
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Solution Overview
Problem
Data storage devices face challenges in accurately synchronizing data and strobe signals, leading to potential errors and inefficiencies in data capture and calibration processes, particularly due to variations in delay values and external factors affecting read paths.
Innovation Solution
A data storage device with a controller that includes a calibration block capable of delaying strobe signals based on different test delay values, testing data capture with these delayed signals, and determining optimal delay values based on test results to minimize skew and enhance precision in data read operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the strobe signal delay is fixed without calibration, then the device complexity is reduced, but the measurement precision of data capture deteriorates due to skew and external factors
Solution Approach 1:
The patent applies preliminary action by performing delay calibration before normal data read operations. The controller pre-determines the optimal delay value for the strobe signal through test read operations, storing this calibrated delay value for subsequent use. This preliminary calibration action ensures high measurement precision in data capture while avoiding the need for complex real-time adjustment mechanisms during normal operation.
2Measurement precision
If repeated read operations are performed for calibration, then the measurement precision improves, but the productivity decreases due to time consumption
Solution Approach 1:
The calibration process is performed as a preliminary one-time action during device initialization or setup, rather than repeatedly during normal operation. The optimal delay value determined through test read operations is stored and reused for all subsequent data read operations, thereby achieving high measurement precision without continuously sacrificing productivity.
Solution Approach 2:
The system performs self-calibration automatically during initialization without requiring external intervention or repeated manual calibration operations. The controller autonomously executes test read operations, determines the optimal delay value, and configures the strobe signal timing, enabling the device to serve its own calibration needs efficiently.
3Ease of operation
If the strobe signal delay is not optimized, then the ease of operation is maintained, but the reliability of data capture deteriorates due to skew and external factors
Solution Approach 1:
The optimal strobe signal delay value is pre-determined through calibration before normal operation begins. This preliminary optimization of the delay parameter ensures reliable data capture under varying conditions without requiring the user to manually adjust settings during operation, thereby maintaining ease of operation while significantly improving reliability.
Solution Approach 2:
The patent optimizes the delay parameter of the strobe signal based on empirical testing and calibration results. By adjusting this critical timing parameter to its optimal value, the system achieves reliable data capture despite variations in external factors such as temperature or manufacturing tolerances, without complicating the user interface or operation.
Data Source
AI summary
A data storage device includes a memory device suitable for storing and outputting data in synchronization with a strobe signal; and a controller suitable for delaying the strobe signal based on each of different test delay values, testing capture of the data by using a delayed strobe signal, and determining a delay value of the strobe signal based on a test result.