Memory Controller Phase Calibration via Write-Read Gaps
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Solution Overview
Problem
The existing communication systems between memory controllers and memory devices face inefficiencies due to timing gaps caused by resource conflicts, leading to undesirable idle time slots that affect overall system efficiency.
Innovation Solution
The proposed solution utilizes the write-to-read timing gaps to perform phase tracking and calibration operations by transmitting phase calibration data and error information back and forth between the memory controller and device, maintaining a correct phase relationship without interrupting normal memory operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If timing gaps are introduced for resource contention resolution between write and read operations, then resource conflicts are avoided, but system efficiency deteriorates due to idle time slots
Solution Approach 1:
The patent converts the harmful idle time slots (WR gaps) caused by resource contention into beneficial calibration opportunities. Phase calibration data is transmitted from memory controller to memory device, and phase error information is transmitted back during these gaps, transforming wasted time into productive calibration cycles that maintain synchronization without disrupting normal operations
Solution Approach 2:
The patent makes the communication channel multi-functional by using it for both normal data transmission and phase calibration purposes. The same data link is used for writing data, reading data, and transmitting calibration information, eliminating the need for dedicated calibration channels and maximizing resource utilization
2Measurement precision
If phase calibration operations are performed during normal memory operations, then calibration accuracy is improved through continuous tracking, but operation disruption increases
Solution Approach 1:
The patent implements periodic phase calibration by utilizing WR gaps that occur naturally during memory operations. Instead of continuous calibration that would disrupt operations, the system performs calibration periodically at appropriate intervals when WR gaps occur, maintaining phase accuracy while preserving operation continuity
Solution Approach 2:
The patent performs phase calibration in advance during WR gaps before the next critical read operation. By proactively maintaining phase synchronization during idle periods, the system ensures accurate data retrieval is ready when needed without interrupting the actual memory access operations
3Productivity
If idle time slots are utilized for calibration data transmission, then resource utilization is improved, but communication overhead increases
Solution Approach 1:
The patent implements self-service calibration where the memory device autonomously processes phase calibration data and generates phase error information without requiring complex controller intervention. This reduces communication overhead by minimizing the amount of data that needs to be transmitted and processed externally
Data Source
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AI summary
A system for calibrating timing for write operations between a memory controller and a memory device is described. During operation, the system identifies a time gap required to transition from writing data from the memory controller to the memory device to reading data from the memory device to the memory controller. The system then transmits a test data pattern to the memory device within the time gap. The system subsequently uses the received test data pattern to calibrate a phase relationship between a received timing signal and data transmitted from the memory controller to the memory device during write operations.