Dynamic Clock Frequency Adjustment for I/O Power Management
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Solution Overview
Problem
Existing electronic systems face challenges in managing power consumption of input-output devices, particularly in dynamically adjusting power states to optimize energy efficiency while maintaining the ability to interpret wake-up commands.
Innovation Solution
A method and system that dynamically adjust the frequency of a clock signal transmitted between a host device and an input-output device based on its power state, reducing power consumption in lower power states while preserving the ability to interpret commands, by transitioning between lower and higher power states and adjusting clock frequencies accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the clock signal frequency is reduced to lower power consumption in a lower power state, then power requirements are reduced, but the ability to interpret wake-up commands may be compromised
Solution Approach 1:
The patent applies dynamics by making the clock signal frequency adjustable based on the power state of the I/O device. The host device dynamically changes the clock frequency from a lower frequency (first frequency) when the I/O device is in a lower power state to a higher frequency (second frequency) when the I/O device transitions to a higher power state. This dynamic adjustment allows the system to optimize power consumption while ensuring that the I/O device can properly interpret commands in both power states, as the clock frequency is adapted to match the operational capabilities of the device in each state.
2Reliability
If the clock signal frequency is increased to maintain command interpretation capability, then reliability is improved, but power consumption increases
Solution Approach 1:
The patent applies parameter changes by modifying the clock signal frequency parameter based on the power state of the I/O device. When the I/O device is in a lower power state, the host device transmits a clock signal at a lower frequency, reducing power consumption. When the I/O device transitions to a higher power state, the host device increases the clock frequency to ensure proper command interpretation. This parameter adjustment resolves the contradiction by matching the clock frequency to the operational state of the device, achieving both power efficiency and reliability.
Data Source
AI summary
In an example, a method includes determining, at a host device, a power state of a digital input/output device, and transmitting a clock signal having a first frequency from the host device to the input/output device responsive to a determination that the input/output device is in a lower power state. The method also includes determining, at the host device, that the input/output device has transitioned into a higher power state, and transmitting a clock signal having a second frequency from the host device to the input/output device responsive to a determination that the input/output device has transitioned into the higher power state. The first frequency is lower than the second frequency.