Dynamic Power Adjustment in RAM Subsystems
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Solution Overview
Problem
Current memory subsystems face challenges in reducing power consumption without significantly impacting performance, as high-speed memories consume a substantial portion of the power budget, and frequency reduction often results in inadequate power savings or performance loss.
Innovation Solution
A method and apparatus that dynamically adjust the frequency and supply voltage of the memory clock signal, along with configuring latency parameters, to reduce power consumption in RAM, allowing for controlled re-initialization to optimize power usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If frequency of memory clock signal is reduced, then power consumption is reduced, but performance is significantly lost
Solution Approach 1:
The patent applies parameter changes by simultaneously adjusting multiple operating parameters (frequency and voltage) rather than changing only frequency. The processor dynamically modifies both the clock frequency and supply voltage to achieve power reduction while maintaining acceptable performance levels. This multi-parameter adjustment resolves the contradiction by finding an optimal balance point where power consumption is reduced without proportionally sacrificing performance.
Solution Approach 2:
The patent implements dynamic power adjustment where the processor continuously monitors and adjusts frequency and voltage based on system conditions. This dynamic approach allows the system to adapt to varying workload requirements, maintaining high performance when needed while reducing power consumption during lower-demand periods, thus resolving the static trade-off between power and performance.
2Use of energy by moving object
If frequency of memory clock signal is reduced to achieve desired power consumption, then power consumption is reduced, but performance is significantly lost
Solution Approach 1:
The patent changes multiple parameters simultaneously (frequency and voltage) rather than relying solely on frequency reduction. By adjusting voltage in conjunction with frequency, the system can maintain memory speed characteristics better than frequency-only reduction would allow, while still achieving the desired power consumption reduction.
3Use of energy by moving object
If voltage is reduced to RAM, then power consumption is reduced, but system stability may be affected
Solution Approach 1:
The patent employs feedback mechanisms where the processor monitors system operation after voltage and frequency adjustments. If errors or instability are detected, the system can revert to previous stable operating parameters. This feedback loop ensures that voltage reduction does not compromise system reliability, resolving the contradiction between power reduction and stability.
Solution Approach 2:
The patent implements protective measures by configuring latency parameters and preparing re-initialization sequences before voltage changes take full effect. This cushioning approach ensures that even if voltage reduction causes instability, the system has pre-configured safeguards to maintain operation or gracefully recover, preventing complete system failure.
Data Source
AI summary
An aspect of the invention relates to a method of dynamically adjusting power consumption of a random access memory (RAM) coupled to a processor. Frequency of a memory clock signal coupled to the RAM is reduced. At least one supply voltage coupled to the RAM is reduced. At least one latency parameter of the RAM is configured in response to the reduced frequency and the reduced at least one supply voltage. The RAM may then be re-initialized. In this manner, voltage supplied to the RAM is reduced, thereby reducing power consumption in the RAM.