Memory Bus Timing Calibration via Individual Skew Parameters
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Solution Overview
Problem
Memory systems face challenges in ensuring reliable communication due to timing misalignment between control and information signals across memory devices, caused by varying wiring lengths, process variations, and temperature gradients, which can lead to reduced operating speed and increased error rates.
Innovation Solution
A method and system where a memory controller calculates and stores individual skew parameters for each memory device to correct timing misalignment, with the option to derive a common skew parameter for all devices, allowing each device to adjust its timing alignment, thereby simplifying the memory controller's management and ensuring synchronized signal alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If individual skew parameters are calculated and stored for each memory device, then timing alignment precision is improved, but device complexity increases
Solution Approach 1:
The timing calibration is segmented into two levels: a common skew parameter applied to all memory devices and individual skew parameters for each device. This segmentation allows the controller to manage timing calibration in a hierarchical manner, improving precision without overwhelming complexity
Solution Approach 2:
The system changes timing parameters dynamically by calculating skew parameters based on measured timing misalignments. The common and individual skew parameters are stored and applied to adjust timing relationships, enabling precise timing alignment while maintaining manageable complexity through parameterization
2Reliability
If timing calibration is performed for each memory device, then communication reliability is improved, but processing time increases
Solution Approach 1:
The skew parameters are calculated and stored in advance during an initial calibration phase. Once calibrated, these parameters are reused for subsequent operations, ensuring reliable communication without repeating the time-consuming calibration process for each operation
Solution Approach 2:
The calibration process merges common timing characteristics applicable to all devices with individual device-specific adjustments. This combination allows efficient calibration that accounts for both shared and unique timing characteristics, balancing reliability with processing time
3Manufacturing precision
If skew parameters are stored coupled to each memory device, then timing correction precision is improved, but storage requirements increase
Solution Approach 1:
Storage is segmented into two parts: common skew parameters stored centrally and individual skew parameters stored locally with each memory device. This segmentation optimizes storage utilization by placing only device-specific data at the device level
Solution Approach 2:
Individual skew parameters are stored locally coupled to each memory device where they are most needed for immediate timing correction, while common parameters are stored centrally. This local quality approach ensures precise timing correction at the point of use without excessive distributed storage requirements
Data Source
AI summary
A method includes communicating between a memory controller and multiple memory devices over an interface that includes at least a control signal and an information signal. For each memory device, a respective individual skew parameter, which is indicative of a timing misalignment between the control signal and the information signal when communicating with that memory device, is produced. The respective individual skew parameter is stored coupled to each memory device. The timing misalignment is corrected at the memory device using the stored individual timing skew.