Memory Bus Timing Alignment With Device-Level Clock Tuning
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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
Implementing a method to optimize clock trees separately for coarse alignment across multiple memory devices and isolate individual devices for fine-tuning of device-specific alignment and signal equalization, using phase shifters, delay circuits, and equalizers to adjust timing and amplitude of incoming signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate optimization of clock trees is implemented for coarse alignment, then clock skew is minimized, but device complexity increases
Solution Approach 1:
The patent divides the clock alignment optimization into two separate segments: coarse alignment optimization applied to clock trees at the module level, and fine-tuning optimization applied to individual memory devices. This segmentation allows each level to be optimized independently, achieving precise clock alignment without overwhelming complexity in a single step.
Solution Approach 2:
The patent performs preliminary coarse alignment optimization on clock trees before conducting fine-tuning on individual devices. This preliminary action establishes a baseline alignment that reduces the subsequent adjustment needed at the device level, making the overall process more manageable and efficient.
2Manufacturing precision
If individual devices are isolated for fine-tuning, then device-specific alignment precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent enables independent isolation and tuning of individual memory devices through segmented control of clock tree activation. Each device can be selectively activated or deactivated during the tuning process, allowing precise device-specific optimization without affecting other devices, thereby simplifying the manufacturing process.
3Reliability
If phase shifters and delay circuits are used for timing adjustment, then clock skew is reduced, but device complexity increases
Solution Approach 1:
The patent utilizes phase shifters and delay circuits to dynamically adjust timing parameters of clock signals. By changing phase and delay parameters, the system achieves precise clock alignment and minimizes clock skew, thereby improving read/write accuracy while managing the added complexity through parameter-based control.
4Reliability
If equalizers are implemented for signal equalization, then signal integrity is improved, but device complexity increases
Solution Approach 1:
The patent implements equalizers that provide localized signal equalization tailored to specific signal paths and device characteristics. By applying equalization selectively to individual devices or signal paths based on their specific requirements, the system improves signal integrity without unnecessarily increasing complexity across the entire system.
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).