Memory Device Clocking Mechanism for Access Time Uniformity
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Solution Overview
Problem
Memory devices, such as DRAM, face performance variations due to environmental and design-related factors like propagation delay and fringing capacitance, which affect access time and data communication efficiency.
Innovation Solution
Implementing a clocking mechanism that uses different clock signals for different data communication paths to account for varying propagation delays, with a delay module generating clock signals based on the separation distance, circuit components, and fringing capacitance to synchronize data transmission across the memory device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different clock signals are used for different data communication paths to account for varying propagation delays, then access time uniformity and performance are improved, but device complexity increases due to the need for multiple clock signals and delay modules
Solution Approach 1:
The clocking mechanism is segmented into multiple independent clock signals (first clock signal and second clock signal) that can be independently adjusted and controlled. Each clock signal is tailored to specific data communication paths based on their propagation delay characteristics, allowing precise timing control without requiring complex interdependencies across the entire system.
Solution Approach 2:
The delay module pre-adjusts the timing of clock signals before they are applied to different data communication paths. By calculating and compensating for propagation delays in advance based on path characteristics (separation distance, circuit components, fringing capacitance), the system ensures synchronized data arrival without requiring complex real-time adjustments.
2Reliability
If additional shielding or complex circuit layouts are implemented to reduce propagation delay variations, then signal integrity improves, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of physically modifying the circuit layout or adding shielding structures, the invention changes the temporal parameters of the clock signals (frequency, phase, timing offsets) to compensate for propagation delay variations. This software-like approach to hardware timing preserves manufacturing simplicity while achieving signal integrity.
Solution Approach 2:
The invention replaces physical/mechanical solutions (shielding, complex routing) with an electrical/control-based solution (adjusted clock signals). By substituting the need for complex physical structures with intelligently timed electrical signals, the system achieves signal integrity without increasing manufacturing complexity.
Data Source
AI summary
A memory device includes a first data driver configured to send according to a first clock signal a first data to a first data port; a second data driver configured to send according to a second clock signal a second data to a second data port, wherein the second clock signal does not match the first clock signal.