SoC Processor Frequency Control via Voltage Feedback Loop
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Solution Overview
Problem
Existing systems for managing processor operating frequencies in SoCs lack direct control over dc supply voltage changes and fail to ensure that the selected voltage level is actually delivered to the processor, leading to potential hardware damage and erratic processing results.
Innovation Solution
A feedback mechanism that dynamically manages processor operating frequencies by controlling the voltage regulator, disabling the processor during power supply changes, monitoring the actual dc voltage, and enabling operation only at frequencies supported by the stabilized voltage level.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the processor operating frequency is increased to achieve higher throughput, then the processing speed is improved, but the risk of hardware damage and erratic processing results increases due to lack of direct voltage control and monitoring
Solution Approach 1:
The patent implements a feedback mechanism where the controller monitors the actual dc supply voltage level and uses this information to determine whether the processor can safely operate at the requested higher frequency. The feedback loop ensures that frequency changes are only permitted when the monitored voltage is sufficient, preventing hardware damage while enabling higher throughput when voltage conditions allow.
Solution Approach 2:
The patent replaces manual mechanical voltage adjustment methods (soldering resistor/ladder components or rotating potentiometers) with an automated electronic control system. The controller electronically manages voltage regulator outputs and processor frequency settings through software-based feedback, eliminating manual intervention while maintaining reliable voltage-frequency coordination.
2Adaptability or versatility
If manual intervention is used to change dc supply voltage by modifying resistor/capacitor/conductor ladder components, then the voltage level can be adjusted, but the operation becomes cumbersome and subject to user error
Solution Approach 1:
The controller automatically manages voltage regulator outputs and processor frequency settings without requiring user intervention. The system self-adjusts voltage and frequency based on monitored conditions and feedback, eliminating the need for manual component modification while maintaining adaptability to different operating requirements.
Solution Approach 2:
The patent replaces manual mechanical adjustment of resistor/ladder components with electronic control through the controller. Users can still adjust voltage levels through software interfaces, but the actual voltage regulation is performed automatically by the controller managing the voltage regulator, transforming a cumbersome mechanical process into an automated electronic one.
3Speed
If the processor is kept in the fully 'on' state to react to worst case loading conditions, then the response capability is improved, but the power consumption increases
Solution Approach 1:
The patent implements dynamic voltage and frequency scaling (DVFS) where the controller adjusts the processor's operating frequency and voltage levels based on actual workload conditions. Instead of maintaining a fixed high-power state, the system dynamically adapts to varying load requirements, reducing power consumption during low-demand periods while maintaining the capability to respond to worst-case loading when needed.
Data Source
AI summary
A system and method are provided for using feedback to control processor frequencies in a system-on-chip (SoC). The method is associated with an SoC having a processor operating frequency responsive to a processor supply voltage on a first SOC interface, and a controller for managing the operating frequency. The controller accepts a frequency selection command associated with a first operating frequency, at a second SoC interface. The controller sends a first voltage command associated with the first frequency, via a third SOC interface, to a voltage regulator supplying the processor supply voltage. Then, the controller monitors the processor supply voltage. In response to detecting a processor first supply voltage, the processor is enabled to operate at the first frequency.