Memory Interface Clock and Voltage Tuning for Reliable Throughput
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Solution Overview
Problem
Data storage devices often operate at a fixed clock frequency, which results in a data transfer rate lower than the theoretical maximum due to worst-case scenario considerations, leading to inefficiencies and potential errors.
Innovation Solution
A data storage device with a controller that dynamically adjusts the frequency and voltage of its memory interface based on inputs such as internal device conditions, host inputs, device lifetime, temperature, and voltage, allowing for real-time optimization of clock frequency to avoid setup/hold violations and maximize performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the clock frequency is set to a fixed value based on worst-case scenarios, then reliability is improved, but productivity deteriorates due to lower data transfer rates
Solution Approach 1:
The patent implements dynamic frequency adjustment by transitioning from a fixed clock frequency to a variable frequency system. The controller monitors setup and hold time violations in real-time and adjusts the clock frequency dynamically between a minimum frequency (based on worst-case scenarios) and a maximum frequency (when conditions permit), allowing the system to adapt to changing operational conditions and achieve higher average data transfer rates while maintaining reliability
Solution Approach 2:
The patent changes the operational parameters of the clock signal by adjusting its frequency based on monitored conditions. The controller modifies the clock frequency parameter within a defined range (from minimum to maximum frequency) depending on the occurrence of setup/hold time violations, enabling the system to operate at higher speeds when conditions allow while falling back to conservative speeds when reliability is at risk
2Productivity
If the clock frequency is increased to achieve higher data transfer rates, then productivity is improved, but reliability deteriorates due to potential setup and hold time violations
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors for setup and hold time violations on the data bus. When violations are detected, the controller receives feedback that the current frequency is too high and responds by decreasing the clock frequency. When no violations occur over a predetermined period, the controller increases the frequency. This closed-loop feedback system enables the system to automatically maintain reliable operation while maximizing data transfer rates
Solution Approach 2:
The patent establishes predetermined frequency ranges (minimum and maximum frequencies) before operation begins. The minimum frequency is calculated based on worst-case scenarios to ensure reliability, while the maximum frequency represents the theoretical maximum data transfer rate. The controller operates within these pre-defined boundaries, making preliminary preparations that prevent reliability issues while enabling high-speed operation when conditions permit
Data Source
AI summary
A data storage device includes a controller and a memory. The controller includes a host interface and a memory interface. The controller receives inputs from the host, internal storage device inputs, device lifetime calculations, temperature readings and voltage readings. The controller then dynamically adjusts the frequency and voltage for the memory interface based upon the inputs received. As such, the memory interface operates are optimum conditions.