Memory Device Clock Alignment Tuning via Segmented Control
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Solution Overview
Problem
Existing memory devices face challenges in achieving precise clock alignment between clock signals and command/address signals due to variations in device performance and manufacturing tolerances, leading to potential memory reading and writing inaccuracies.
Innovation Solution
The solution involves optimizing clock trees for coarse alignment across multiple memory devices and isolating individual devices for fine-tuning of clock and command/address signal alignment, using tuner circuits with phase shifters, delay circuits, and equalizers to adjust signal timing and amplitude, and employing registering clock drivers to perform clock training and per-memory-device optimization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If clock trees are optimized for coarse alignment across multiple memory devices, then clock skewing is reduced at the system level, but individual device-specific timing variations cannot be addressed
Solution Approach 1:
The patent segments the clock alignment problem into two levels: coarse alignment at the clock tree level and fine alignment at the individual device level. This segmentation allows each level to address specific timing variations appropriately, with the tuner circuit enabling fine-tuning of individual devices without requiring complete system redesign.
Solution Approach 2:
The tuner circuit acts as an intermediary component between the clock tree and individual memory devices. It provides a mechanism for fine-tuning device-specific timing variations while maintaining the overall coarse alignment established by the clock tree optimization, thus resolving the contradiction between system-level and device-level alignment requirements.
2Manufacturing precision
If manufacturing tolerances are reduced to improve device performance consistency, then clock alignment improves, but manufacturing costs and complexity increase
Solution Approach 1:
The tuner circuit enables memory devices to self-adjust their timing parameters to compensate for manufacturing variations. Instead of requiring extremely tight manufacturing tolerances, the system allows devices to automatically tune themselves, reducing the burden on manufacturing precision while maintaining performance consistency.
Solution Approach 2:
The patent utilizes adjustable timing parameters through the tuner circuit to compensate for manufacturing tolerances. By changing timing parameters dynamically rather than relying solely on fixed manufacturing precision, the system achieves consistent performance without increasing manufacturing complexity or cost.
3Measurement precision
If per-device tuning circuits are added to each memory device, then device-specific timing alignment is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The tuner circuit is implemented locally at each memory device to provide device-specific timing adjustment. This local quality approach allows precise timing alignment for each device while keeping the complexity localized rather than system-wide, making the solution scalable and manageable.
Data Source
AI summary
Memory devices, systems including memory devices, and methods of operating memory devices are described, in which clock trees can be separately optimized to provide a coarse alignment between a clock signal and a command/address signal (and/or a chip select signal or other control signal), and/or in which individual memory devices can be isolated for fine-tuning of device-specific alignment between a clock signal and a command/address signal (and/or a chip select signal or other control signal). Moreover, individual memory devices can be isolated for fine-tuning of device-specific equalization of a command/address signal (and/or a chip select signal or other control signal).